bluuebunny/crossref_metadata_2025 huggingface dataset:
Observation of Absorption Wavelength Shift by Varying ITO Film Thickness for Hetero-core Optical Fiber Refractive Index Sensor
Authors: Nakamura Yuna , Watanabe Kazuhiro , Nishiyama Michiko
Published: October 2023

A newly developed optical fiber-based refractive index sensor was proposed using an ITO thin film for practical usage. The proposed sensor had sensitivity using a single-layer film in the near-infrared region.
Evaluation of Dynamic Responses of Hetero-core Fiber Optics Pressure Sensor as Swallowing Assessment Device
Authors: Kadokura Miyuki , Maeda Masanori , Watanabe Kazuhiro , Nishiyama Michiko
Published: October 2023

Dynamic responses of hetero-core fiber optic pressure sensor was evaluated. The experimentally obtained measurement error of swallowing time of males in their 30s was sufficiently small.
Comparison in sensing performance between single-multi-single mode and multi-single-multi mode fiber structure
Authors: Dey Koustav , Majee Anirban , Roy Sourabh
Published: October 2023

Here, a comprehensive analysis on the impact of the sensing fiber lengths on different sensitivities of single mode-multi mode-single mode (SMS) and multi-single-multi mode (MSM) segment sensor probe under different perturbations such as temperature, strain and refractive index has been propounded and studied thoroughly. MSM offers higher performance than SMS.
Control of the Deformation of a Concrete Beam by Use of a Polymer Fiber-Based Interferometric Sensor
Authors: Varyshchuk Vasyl
Published: October 2023

The study presents deformation monitoring of concrete structures using a multimode polymer optical fiber interferometric sensor. The experimental results found that there is a correlation between the results obtained from the fiber sensor and the reference mechanical strain gauge. The presented sensor configuration is suitable for structural health monitoring of concrete structures in practical applications.
Application of the Spectral Mixture Residual for Classifying Plant Communities in the Southeastern USA
Authors: Rogers Jennifer A. , Robertson Kevin M. , Simonson Eli , Sousa Dan
Published: October 2023

We used hyperspectral satellite data (PRISMA) and random forest modeling to classify plant communities in the southeastern U.S. After comparing its effectiveness versus surface reflectance bands, we determined spectral Mixture Residual may improve biodiversity maps.
Simultaneous Measurements of Temperature, H2O concentration and Pressure by Multiline Laser Absorption Spectroscopy
Authors: Jiao Tengfei , Cheong Kin-Pang , Hu Wenju , Ma Liuhao
Published: October 2023

Based on multiline laser absorption spectroscopy, numerical study is conducted to demonstrate the simultaneous measurements of temperature, H2O concentration and pressure by fully utilization of two segments of near infrared spectra.
Temporal Evolution of Fluorescence Signal Retaining Bessel beam Illumination for Optical Trapping of Gold Nanoparticles
Authors: Choudhary Riya , Mondal Samir K. , Srivastava Sachin Kumar
Published: October 2023

Temporal evolution of fluorescence signal of rhodamine-6G for trapping of colloidal gold nanoparticles using Bessel beam illumination was studied for surface-enhanced fluorescence (SEF) based sensors. A stable SEF signal was achieved after 4-minutes of trapping.
Practical considerations for Laser-Induced Grating Spectroscopy (LIGS) using PILOT
Authors: Shah Priyav , Williams Benjamin A O
Published: October 2023

Non-invasive thermometry using the PILOT instrument might require windows to provide optical access. Due to damage threshold considerations, these windows should be made of fused silica or borosilicate with a high quality surface finish.
Photoluminescence Enhancement of MAn-1PbnI3n+1 Perovskite Films by Ag Nanoparticles Sputtering Coating
Authors: delaCruz-Piña Emmanuel , Pareja-Rivera Carina , Rodríguez-Gómez Arturo , Solis-Ibarra Diego , Acuautla Mónica , Reyes-Esqueda Jorge-Alejandro
Published: October 2023

Photoluminescence enhancement of MAn-1PbnI3n+1 perovskite films was obtained by suitable Ag sputtering coatings. A maximum 5-fold photoluminescence intensity increase was achieved with AgNPs with size distribution averaged at 8 nm and no-saturating coating.
Development of a Handheld UV Raman Sensor for Standoff Trace Detection - Argos
Authors: Waterbury Rob , Conghuyentonnu Thuyan , Hardy Hunter , Jacobson Alex , Molner Tim , Robins Ryan , Scott Marshall
Published: October 2023

Alakai Defense Systems has recently developed what we believe is the first one-handed UV Raman sensor for standoff trace detection of chemicals (called Argos). Data will be presented demonstrating the trace detection capabilities of Argos.
Modified spectral reconstruction method for wide spectral range in a static modulated Fourier-transform spectrometer
Authors: Cho Ju Yong , Jang Won Kweon
Published: October 2023

We introduce a modified algorithm to improve spectral resolution in a static modulated Fourier transform spectrometer. The spectral reconstruction for wide range in near infrared region was successfully performed in a modified Sagnac interferometric structure.
Mode spacing of harmonic mode-locked optical frequency combs
Authors: Hasegawa Taro
Published: October 2023

Mode spacing of an optical frequency comb of a harmonic mode-locked laser is studied by using an optical cavity. It turns out that mode spacing disagrees with pulse repetition rate for the harmonic mode-locked comb.
Research on Sensor Correction Method of The Rotating Imaging Optical Satellite
Authors: Fan Chengcheng , Zhang Yonghe
Published: October 2023

Aiming at the problem of difficult mosaic of rotating multi angle images in rotating imaging optical satellites, sensor correction methods are studied, achieving continuous, complete, distortion-free, high-quality image compensation and restoration.
Dehydration analysis of poly-ethylene glycol hydrogels with terahertz imaging
Authors: Baines Daniel K. , Bassu Gavino , Wright Karen , Douglas Timothy E. L. , Degl’Innocenti Riccardo , Laurati Marco , Lin Hungyen
Published: October 2023

Polyethylene glycol (PEG) hydrogel are commonly used as both scaffolds and drug delivery systems to aid in cellular differentiation, thus developing a good understanding of their water properties is key to PEG optimisation. Terahertz (THz) imaging has previously been used to analyse the water content inside polymer films in ambient environment. Here, we apply this approach to extract the desorption profiles of PEG hydrogels of four concentrations producing results that indicate confinement effects due to porosity on the diffusional properties of water. These preliminary data therefore highlight the broad applicability of THz imaging for the analysis of water properties of PEG hydrogels.
Microscale three-dimensional surface reconstruction with line scan camera using color mapping of ray direction
Authors: Ohno Hiroshi
Published: October 2023

A reconstruction method for microscale three-dimensional surfaces on an object with a line scan camera is proposed that uses color mapping of light ray direction through a multicolor filter in an optical imaging system.
Gold Nanofilm as a Temperature Sensor Using Diffuse Reflectance
Authors: Osorio Tascón J. C. , Solis-Tinoco V. , García-Valenzuela A.
Published: October 2023

We propose a rapid and ultra-thin temperature sensor for monitoring thermal processes near the surface of liquid samples. The sensor is based on the changes of diffuse reflectance of a 20 nm thick gold film with temperature.
Using spectral information in agriculture and plant science
Authors: Paulus Stefan , Okole Nathan , Mahlein Anne-Katrin
Published: October 2023

This study shows how spectral sensing of plants extends technical challenges of spectral measuring. A greenhouse experiment shows that plant diseases can be recognized even before a human expert is able to detect visible symptoms.
Emissions Inventory Optimization using Sector-Resolved Dual-Comb Methane Observations
Authors: Mead Griffin J. , Herman Daniel I. , Giorgetta Fabrizio R. , Malarich Nathan A. , Baumann Esther , Washburn Brian R. , Newbury Nathan R. , Coddington Ian , Cossel Kevin C.
Published: October 2023

Dynamic linear model analysis of dual-comb and CRDS methane, ethane, and ammonia measurements extracts sector-resolved methane mixing ratios. From these data, a Bayesian inversion retrieves sector specific energy and agriculture methane fluxes in Northern Colorado.
Accurate Optical Constants Measurements of Liquids for Detection of Aerosols
Authors: Myers Tanya L. , Baker Tracy J. , Primera-Pedrozo Oliva , Tonkyn Russell G. , Johnson Timothy J.
Published: October 2023

Infrared (IR) and near-IR spectroscopy can enable standoff detection of both aerosols and gas-phase samples. Aerosols can be especially challenging since their spectra change based on the aerosol’s morphology. Knowledge of the complex index of refraction can allow for spectral modeling of various sample morphologies to support detection and identification of aerosols.
Saturated-absorption CAvity Ring-down (SCAR) spectroscopy: a disruptive laser technology entering real-life applications
Authors: Bartalini Saverio , Pastor Pablo Cancio , Santi Maria Giulia Delli , Galli Iacopo , Giusfredi Giovanni , Maddaloni Pasquale , Mazzotti Davide , De Natale Paolo
Published: October 2023

Saturated-absorption CAvity Ring-down (SCAR) spectroscopy allowed the first all-optical measurement of the very rare 14CO2 isotopologue of carbon dioxide and has now become a compact and portable system used in a number of key areas.
Phase-sensitive open-path dual-comb spectroscopy with compensation for time jitter of comb and path turbulence
Authors: Huang Chao , Chen Xinyi , Wei Haoyun
Published: October 2023

We report a phase-sensitive open-path dual-comb spectroscopy based on dual-purpose compensation which is immune to the time jitter from comb sources and turbulent noise. High-fidelity gas absorption features over 900-m turbulent air are obtained.
Sub-part-per-billion level measurement of formaldehyde with open-path dual-comb spectroscopy
Authors: Cossel Kevin C. , Herman Daniel I. , Mead Griffin J. , Baumann Esther , Giorgetta Fabrizio R. , Malarich Nathan A. , Washburn Brian R. , Newbury Nathan R. , Coddington Ian
Published: October 2023

We demonstrate formaldehyde measurements with 100 part-per-trillion sensitivity using open-path dual-comb spectroscopy (DCS) in the mid-infrared. The DCS was compared to a calibrated point sensor and was deployed for field measurements over 4 months.
Classifying space-time images obtained from distributed acoustic sensing
Authors: Matthaiou Ioannis , Masoudi Ali , Modafferi Stefano , Brambilla Gilberto
Published: October 2023

In this paper we present a classifier that was trained on space-time images obtained from distributed acoustic sensing, for the purpose of monitoring earthquakes. The model is capable of discriminating between actual and non-earthquake events.
Intracavity Absorption Spectroscopy with Novel Mid-Infrared Solid-State Lasers Covering the 2–7 μm Range
Authors: Fjodorow Peter , Frolov Mikhail P. , Korostelin Yuri V. , Kozlovsky Vladimir I. , Leonov Stanislav O. , Schulz Christof , Skasyrsky Yan K.
Published: October 2023

We report on our recent progress in advancing intracavity absorption spectroscopy into the mid-infrared spectral range by using novel Cr2+- and Fe2+-doped chalcogenide-crystal lasers. Broadband and highly sensitive measurements of various species will be presented.
Precision Atmospheric Wind Measurements with a Frequency Comb Calibrated Laser Heterodyne Radiometer
Authors: Cole Ryan K. , Fredrick Connor , Nguyen Newton H. , Frankenberg Christian , Diddams Scott A.
Published: October 2023

We report atmospheric spectroscopy of CO2 using a frequency comb calibrated laser heterodyne radiometer. The measured spectra exhibit Doppler shifts due to atmospheric wind, and we track the wind-induced shifts with ~10 cm/s precision.
Towards Simultaneous Absorption and Refractive Index Sensing using Integrated Photonics
Authors: Torres-Cubillo Antonia , Sánchez-Postigo Alejandro , Wangüemert-Pérez J. Gonzalo , Molina-Fernández Íñigo , Halir Robert
Published: October 2023

Photonic integrated sensors traditionally detect changes either in optical amplitude or phase. Here we experimentally demonstrate a sensing architecture which measures both amplitude and phase, enabling simultaneous detection of changes in absorption and refractive index.
Birefringent SiGe/Si waveguide for reconfigurable broadband mid-IR sources
Authors: Torre Alberto Della , Bieganski Adam , Armand Remi , Perestjuk Marko , Monat Christelle , Reboud Vincent , Hartmann Jean-Michel , Mitchell Arnan , Nguyen Thach , Grillet Christian
Published: October 2023

We demonstrate mid-IR supercontinuum generation in a birefringent SiGe-on-Si waveguide. By changing the pump polarization, we simultaneously control the bandwidth, flatness and the coherence of the generated spectra.
Toward, Inline optical sensor for monitoring Low-quality irrigation waters
Authors: Sinitsa Sergey , Rosenfeld Lavi , Afgin Yiftah , Reshef Liad , Borisover Mikhail , Klapp Iftach
Published: October 2023

This work demonstrated a continuous fluorescence spectra spectrofluorometer for inflow real-time monitoring of organic matter in the irrigation system. Optical hardware, experimental results, and our progress in developing temperature-invariant supportive algorithms are presented.
Development of a BLOB-detection algorithm based on DoG to detect Plastic in an environmental matrix using FD-FLIM
Authors: Wohlschläger Maximilian , Khan Yamna , Leiter Nina , Versen Martin , Löder Martin , Laforsch Christian
Published: October 2023

The direct identification of plastics in an environmental matrix is heavily researched. We successfully developed a BLOB-detection algorithm based on differences of Gaussians to identify HDPE particles in an artificial environmental matrix using FD-FLIM.
Development of a Neural Network for an Automated Differentiation of Plastics using Rapid-FLIM
Authors: Thomas Amal , Saleem Shaif , Leiter Nina , Dietlmeier Maximilian , Wohlschläger Maximilian , Versen Martin , Laforsch Christian
Published: October 2023

The fast classification and identification of plastics presents a significant challenge. The study assesses the suitability of a Multilayer Perceptron to classify and identify commonly found plastic types using Rapid-FLIM, achieving an accuracy of 88.33%.
Retrievals of greenhouse gases and air pollutants from GOSAT and GOSAT-2
Authors: Someya Yu , Yoshida Yukio
Published: October 2023

GOSAT and GOSAT-2 have continuously observed CO2 and CH4 globally for more than 14 years. In this presentation, we review the retrieval algorithms and the measurement records of these species from GOSAT and GOSAT-2.
Partially Coherent Modelling of a Far-Infrared Few-Mode Fourier Transform Spectrometer
Authors: Lap Bram N.R. , Jellema Willem , Withington Stafford , Naylor David A.
Published: October 2023

Post-dispersed Fourier transform spectrometers employing ultra low-noise detectors are the baseline for future astronomical far-infrared spectroscopic missions. Understanding their combined complex partially coherent behaviour is critical for addressing and controlling the instrument spectral and spatial response.
Cryogenic Testing and Performance Characterization of a Novel Stiffness-compensated, Reactionless Scan Mechanism for a Far-infrared Post-dispersed Polarizing Fourier Transform Spectrometer
Authors: Cournoyer Alain , Bourque Hugo , Carbonneau Éric , Gilbert Patrick , Houle Simon , Boulet Jean-Alexis , Silversides Ian , Grandmont Frédéric , Naylor David , Gom Brad , Christiansen Adam , Buchan Matthew
Published: October 2023

The engineering development unit performance of a novel cryogenic scan
mechanism suitable for post-dispersed polarizing FTS instruments is
characterized at 4 K. Compliance to the stringent SPICA mission
requirements is discussed through test results analysis.
Dual-comb Spectroscopy with OAM modes for Azimuth Angle Measurement
Authors: Asahara Akifumi , Minoshima Kaoru
Published: October 2023

By combining dual-comb spectroscopy and optical vortices, in-plane azimuth angle measurement was performed based on optical frequency combs. The measurable angle range was tailored by the topological charge number of the involved optical vortices.
Mid-IR Dual-Comb Spectroscopy of Acetylene Using a 250-MHz Optical Parametric Oscillator
Authors: Bauer Carolin P. , Willenberg Benjamin , Pupeikis Justinas , Bollier Michelle K. , Phillips Christopher R. , Keller Ursula
Published: October 2023

We demonstrate coherent dual-comb spectroscopy of acetylene at 3070 nm using a spatially-multiplexed dual-comb 250-MHz OPO from a linear single-cavity. The idler is broadly tunable (2900-5170 nm) at high powers per comb line (>120 μW).
EnMAP Spectral and Radiometric Calibration Performance: Year One
Authors: Marshall D. , Alonso K. , Baur S. , Bachmann M. , Gerasch B. , Holzwarth S. , Langheinrich M. , Pato M. , de los Reyes R. , Schneider M. , Schwind P. , Witt H. , Carmona E.
Published: October 2023

Spectral and radiometric calibration of EnMAP is performed through five onboard subsystems, enabling the stability of the instrument to be monitored and for new calibration tables to be generated.
PRISMA, Launched Four Years Ago: Enabling Scientific Studies on Cal/Val and Environmental Applications
Authors: C. Giardino , M. Bresciani , A. Pellegrino , A. Fabbretto , L. Genesio , F. Miglietta
Published: October 2023

An update of the PRISMA mission is presented, showing both the results obtained from the evaluation of PRISMA bottom-of-atmosphere reflectance and by presenting an overview of environmental applications; the next PRISMA2G mission is introduced as an outlook.
AquaWatch Australia: an integrated aquatic ecosystem observing and prediction system including space borne imaging spectrometers
Authors: Dekker Arnold G. , Smith Rowena , Kerblat Flora , Joehnk Klaus , Malthus Tim , Pease Joshua , Fratter Isabel
Published: October 2023

AquaWatch Australia (AquaWatch) is integrating imaging spectrometry Earth Observation, in-situ sensing and water quality modelling to monitor and predict inland and coastal water quality for a wide range of uses in Australia and across the globe.
Mid-infrared gas imaging with direct absorption spectroscopy
Authors: Strahl Thomas , Herbst Johannes , Wöllenstein Jürgen
Published: October 2023

Methane leaks down to 0.25 ml/min can be located and quantified by a single concentration image with a resolution of few ppm*m using direct absorption spectroscopy in combination with mid-infrared imaging and image processing methods.
Methane Airborne Detection Solution for the Oil & Gas Industry with a Focus on Natural Gas Transmission Lines
Authors: Tombet Stéphane Boubanga
Published: October 2023

35-word Abstract: Telops’ Methane Airborne Detection Solution is a highly efficient, flexible and sensitive instrument for the real-time detection and quantification of natural gas leaks for the oil and gas industry.
Needles and sinkers control by machine vision for zero defect manufacturing
Authors: Llamas Víctor , Castanyer Arcadi , Planta Xavier , Serres Josep Maria
Published: October 2023

Development of industrial imaging technology for the detection of failures in needles and sinkers during the manufacturing, for the monitoring of quality control in real time and predictive system by artificial intelligence in knitted fabric.
Investigation of Thermal Fatigue in Metals Using THz Imaging Technique
Authors: Jain Rohit , Singh Khushboo , Bandyopadhyay Aparajita , Sengupta Amartya
Published: October 2023

Terahertz imaging was utilized to study the thermal fatigue in aluminum, brass, and copper. Results show decreased terahertz intensity with increased temperature exposure, aiding in studying thermal fatigue in metals.
A spectral weighting function for improving phytoplankton classification
Authors: Gege Peter
Published: October 2023

A spectral weighting function is presented which optimizes phytoplankton classification from hyperspectral data taking the signal-to-noise ratio of the current image into account. The improvements are illustrated using a DESIS image from Lake Constance.
Retrieving Phytoplankton Functional Groups from Water Reflectance in Optically Complex Waters
Authors: Kutser Tiit , Paavel Birgot , Teeveer Karolin , Ligi Martin , Uusõue Mirjam , Kutser Külli , Vahtmäe Ele
Published: October 2023

It is very hard to discriminate PFGs in optically complex waters even if hyperspectral data is available. Features characteristic to one group may be sometimes observed in reflectance of other phytoplankton groups. Reflectance depends on phytoplankton phenology, biomass and vertical distribution making reflectance spectra of a single group very variable.
Cyanobacteria Detection via VNIR Hyperspectral Imaging and Raman Spectroscopy [Headwall Photonics and Coastal Ocean Vision]
Authors: Roberts Carson , Kepler Charles , Gallager Scott , Killian George
Published: October 2023

Human waste and run-off create conditions for a bloom of cyanobacteria. Hyperspectral imaging was used in conjunction with direct sample collection to create spectral libraries of harmful algal populations to detect and quantify their populations.
Coccolithophore bloom classification in coastal waters from multi-decade satellite ocean colour data
Authors: Smith Marié E. , Thomalla Sandy J. , Matlakala Lebogang
Published: October 2023

A simple three-band algorithm can detect coccolithophore blooms across multiple years of satellite imagery, and discriminate them from background signals of phyto-plankton and suspended particulate matter in coastal waters.
Denoising and Dimensionality Reduction for Improving Constrained Energy Minimization in Hyperspectral Imagery Analysis
Authors: Qian Shen-En , Chen Guang Yi
Published: October 2023

A new hyperspectral objects detection method is presented. It adaptively reduces noises of a hyperspectral image followed by dimensionality reduction before generating a Constrained Energy Minimization (CEM) map for detection. Experimental results show that the method improves CEM detection accuracy significantly for tested hyperspectral images.
Unsupervised Detection in Hyperspectral Imagery
Authors: Bahr Thomas , Streutker David , Terrie Greg , Ingram Michael
Published: October 2023

Performance of six state-of-the-art unsupervised target detection algorithms were compared, including three least squares spectral unmixing based methods. UnConstrained Abundance, Nonnegatively Constrained Abundance and Fully Constrained Abundance performed best at detecting the desired endmembers.
Covert fault detection with imbalanced data using an improved autoencoder for optical networks
Authors: Zhang Chunyu , Zhang Min , Liu Songlin , Liu Zhuo , Wang Danshi
Published: October 2023

Covert faults are characterized by the performance parameters falling within the normal range, without any observable abnormalities. These types of faults pose a significant risk as they present no apparent warning signs of potential danger. Therefore, it is crucial to establish an efficient covert fault detection method to ensure the reliable and stable operation of optical networks. Data-driven technology, which reveals the internal relations and data patterns between the historical data by mining and analyzing the historical data, offers a new perspective for covert fault detection. However, equipment failures are extremely rare in real optical network systems, and the data imbalance of covert fault samples poses a challenge for standard machine learning classifiers in learning precise decision boundaries. To address this challenge, we propose a fault detection scheme based on an improved autoencoder for covert fault detection under data imbalance. The designed covert fault detection model exclusively utilizes normal samples during training and remains unaffected by data imbalance. Specifically, the model is specifically designed according to a number of encoder and decoder components to learn the normal sample data patterns in the latent space and detect covert faults based on the reconstruction errors in that space. To validate the proposed scheme, we conducted experiments using actual backbone data. According to the results, the detection accuracy and F1 score of the designed model on the test set were 0.9811 and 0.9527, and the false negative and false positive rates were 0.0026 and 0.0227, respectively. Furthermore, the visualization of the latent space reconstruction error principle for detecting covert faults was implemented using the principal component analysis dimension reduction and scatter plots.
Stark broadening of the cesium 52D5/2 → 102F line shape
Authors: True Timothy M. , Rice Christopher A. , Pitz Greg A. , Perram Glen P.
Published: October 2023

Pump modulated laser absorption spectroscopy was used to measure the cesium 52D5/2→102F5/2,7/2 line shape. Alkali density in an optically pumped low pressure cell was increased from 0.5 to 85×1012cm−3, resulting in a factor of 200 increase in Lorentzian width due to Stark broadening (2.76GHz/1012cm−3). The observed red shift is consistent with literature, and the shift-to-width ratio δ/γ=−0.356±0.015 informs an electron temperature of 1820±100K. A linear trend between alkali density and electron density is seen, suggesting that electron impact is the primary plasma production mechanism. A maximum ionized concentration of 28% was observed.
Wide-range OFDR strain sensor based on the femtosecond-laser-inscribed weak fiber Bragg grating array
Authors: Fu Cailing , Sui Ronglong , Peng Zhenwei , Meng Yanjie , Zhong Huajian , Shan Rongyi , Liang Wenfa , Liao Changrui , Yin Xiaoyu , Wang Yiping
Published: October 2023

A wide-range OFDR strain sensor was demonstrated based on femtosecond-laser-inscribed weak fiber Bragg grating (WFBG) array in standard SMF. A WFBG array consisting of 110 identical WFBGs was successfully fabricated along a 56 cm-long SMF. Compared with SMF, the cross-correlation coefficient of WFBG array was improved to 0.9 under the strain of 10,000 µε. The position deviation under the strain of 10,000 µε, i.e., 2.5 mm, could be accurately obtained and compensated simply by using peak finding algorithm. The maximum measurable strain of single- and multi-point strain sensing was up to 10,000 µε without using any additional algorithms, where the sensing spatial resolution was 5 mm.
What can we learn about climate change using optical fibers
Authors: Gonzalez-Herraez Miguel , Fernandez-Ruiz Maria R. , Martins Hugo F. , Becerril Carlos , Martin-Lopez Sonia , Williams Ethan , Zhan Zhongwen , Claret Mariona , Pepegrí Jose Lluis , Ugalde Arantza , Villaseñor Antonio , Ranero Cesar , Callies Jorn , Winters Kraig
Published: October 2023

We review our work on the use of Distributed Acoustic Sensing for characterizing oceanographic processes. We show that this tool offers new insights on the mechanisms underpinning water mixing which are key in climate regulation.
Optimum Wavelength for Maximum Range of an OTDR for Strain Measurement with POF
Authors: Dengler Simon Andreas , Engelbrecht Rainer , Schmauss Bernhard
Published: October 2023

With polymer optical fibers (POF), optical time domain reflectometry (OTDR) can be used to measure strain in soil spatially resolved. We discuss the signal to noise ratio (SNR), find the optimal wavelength and the range limitations of the measurement technique.
Plasmonic Gas Sensor based on Graphene Sheet and Trapezoidal Nanotrenches on Silver Substrate
Authors: Maleki Morteza , Yousefi Somayeh
Published: October 2023

Trenches introduced in a two-dimensional grating, filled and covered with Si3N4. The graphene sheet leads to perfect absorption at 672 nm where the surface plasmon mode shows a sensitivity of 440 nm/RIU in gas-sensing applications.
Deeply Etched Optofluidic MEMS Cavity in a Fibre Ring Laser Configuration for High Resolution Refractive Index Sensing
Authors: Mahfouz Ahmed , Sabry Yasser M. , Bourouina Tarik , Omran Haitham
Published: October 2023

We present an optofluidic MEMS cavity in direct passive and active ring laser configurations for high resolution refractive index sensing. The cavity consists of two curved and slotted Silicon mirrors fabricated by deep reactive ion etching with a submillimetre separation between the mirrors for a fused Silica cylindrical optofluidic channel. The ring laser active configuration demonstrates a sensitivity and figure of merit of more than 5,000 nm/RIU and 25,000 respectively compared to 780 nm/RIU and 260 for the direct passive configuration
Quantum Ghost Imaging for Remote Sensing
Authors: Walter Dominik , Pitsch Carsten , Bürsing Helge
Published: October 2023

An advanced setup for quantum ghost imaging that features asynchronous detection enables low-noise 3D imaging of distant objects. Recent experimental results show the potential of the setup to outperform classical systems in many aspects.
Optical phase-sensing for coherent beam combining via CMA-ES algorithm
Authors: Yeo Minsu , Kim Hansol , Kim Byungho , Jeong Yoonchan
Published: October 2023

In this paper, a CMA-ES algorithm-based phase-sensing method is proposed and investigated. Thanks to the probability-based operational property of optimization conducted by the covariance matrix, the proposed method can yield excellent phase-sensing performances regardless of beam-combining parameters.
Measurement of a Flowing Liquid Metal Film with a Chromatic Confocal Sensor
Authors: Eliyahu I. , Berkovic G. , Vaintraub S. , Zilberman S. , Goldberg N. , Dadon M. , Reinfeld E. , Shafir E. , Lapin I. , Isyakov H. , Paami H.
Published: October 2023

A commercial chromatic confocal sensor has been used to characterize the thickness of a flowing Gallium-Indium liquid metal jet proposed as a target for a proton/deuteron accelerator.
SPR biosensor based on a grating coupler operating in the optical switch configuration
Authors: Laffont E. , Crespo-Monteiro N. , Valour A. , Berini P. , Jourlin Y.
Published: October 2023

A highly sensitive plasmonic biosensor based on monitoring two diffraction orders reflected from a sinusoidal Au grating is proposed. The biosensor which operates as an optical switch is demonstrated by detecting anti-BSA (bovine serum albumin) using a BSA-functionalised surface.
Fabrication of Polymer Optical Waveguide-Based Mach-Zehnder Interferometer Microsensors for Integrated Optofluidic Biodetection
Authors: Wang Han , Chen Zhituo , Li Taige , Shi Yaocheng , Zhang A. Ping
Published: October 2023

We demonstrate an integrated optofluidic chip with polymer optical Mach-Zehnder interferometer microsensors. A digital ultraviolet lithography is applied to fabricate high-quality polymer optical waveguide components and Mach-Zehnder interferometer microsensors for on-chip integrated label-free biodetection.
Wearable technology to monitor transcutaneous oxygen and carbon dioxide partial pressure
Authors: Cascales Juan Pedro , Roussakis Emmanuel , Greenfield Daniel A. , Witthauer Lilian , Li Xiaolei , Goss Avery , Keshishian Helen , Nguyen John Q. , Marks Haley L , Draghici Adina E. , Taylor J. Andrew , Evans Conor L
Published: October 2023

We have developed a werable device platform technology for the transcutaneous detection of oxygen and carbon dioxide partial pressure. We present successful clinical results of tissue oxygenation during local and systemic changes in blood flow.
Ultra-Stable Range-Extended Chirped-Pulse DAS Using Coherent Detection
Authors: Vidal-Moreno Pedro J. , Fernández-Ruiz María R. , Martins Hugo , Martin-Lopez Sonia , Gonzalez-Herraez Miguel
Published: October 2023

We present a coherent multifrequency demodulation CP-ΦOTDR system that allows the use of wide filters in detection instead of narrow and tunable filters. Additionally, this opens the door to the use of linear decoding techniques.
Experiments of Noncontact Nano-displacement Sensing by Alternating Quadrature Phase Modulated Reference Light
Authors: Kondo Mitsuki , Ito Ayumi , Wang Xiaoyan , Hanawa Masanori
Published: October 2023

The use of quadrature phase modulated reference light simplified optical noncontact nanometer displacement measurements and provided 99.9% of measurement linearity from few nanometers to almost one hundred nanometers with a resolution of approximately 0.36nm.
Microwave Photonic Demodulation Based on Fiber Loop and Constructed Virtual Reflective Surface for Sapphire Fiber Fabry-Perot Interferometry
Authors: Li Rui , Lei Xiaohua , Lv Shaojie , Chen Yuru , Liu Xianming , Zhang Peng
Published: October 2023

To improve the sensitivity of sapphire fiber Fabry-Perot interferometer (FPI) in microwave band, a virtual FPI is composed by a sapphire fiber end face and a virtual reflecting surface. Reflected signals of multi-loop are analyzed.
Label-free optical E.coli DNA based on ZnS/Mn-TGA nanomaterials
Authors: Nguyen Son Hai , Vu Phan Kim Thi , Tran Mai Thi
Published: October 2023

An optical E.coli DNA sensor based on ZnS/Mn-TGA nanomaterials was constructed. The sensor responds linearly from 10-22 to 10-11 M and has a detection limit of 10-22 M.
Hybrid Dielectric-Metal Nanostructures for Applications in Affinity Biosensors
Authors: Sohrabi Foozieh , Mohammadi Ershad , Homola Jiří
Published: October 2023

Hybrid dielectric/metal nanostructures can facilitate high-performance and selective biosensing. This study develops a new sensing structure that provides multiple resonances with different sensitivities and efficient mass transport.
Photonic Integrated Circuit (PIC) and Protein Catalyzed Capture (PCC) Biosensor for Streptavidin
Authors: Morales Jennifer M. , Liu Sanchao , Coppock Matthew , Bickford Justin R. , Cho Pak , Pellegrino Paul M.
Published: October 2023

PIC sensors are integrated with PCCs to create a heat-resistant sensing platform. Here we show our proof-of-concept biosensor for sensing streptavidin in complex media.
Isolating True Photoplethysmography in Wearable Optical Sensors from Skin Thickness and Skin Tone: A Time-of-Flight Solution
Authors: Du Le V. N. , Badolato Elizabeth
Published: October 2023

This paper introduces the concept of time-of-flight photoplethysmography (TOF-PPG) and critically examines its credibility over the common continuous-wave (CW-) PPG, and how it may impact the conclusion for morbidly obese group with dark skin tone.
CMT based Fast Analytical Model of a Ring Resonator Refractive Index Biosensor
Authors: Kundal Sanchit , Kumar Rakesh , Khandelwal Arpit , Hiremath Kirankumar R.
Published: October 2023

For detecting skin cancer, a silicon nitride based ring resonator refractive index sensor is modelled using coupled mode theory. This device has a high sensitivity of 249nm/RIU and Q factor of 1310.
Dispersion Spectroscopy using a Code Division Multiplexed Re-Entrant Delay Line
Authors: Wong Justin , Bandutunga Chathura , Gray Malcolm , Chow Jong
Published: October 2023

We present a frequency noise immune, self calibrating fiber dispersion spectrometer enabled by a novel code-division multiplexed phase readout. It is used to interro-gate the anomalous dispersion of Hydrogen Cyanide
Silicon-based Spectral-Domain OCT through Grating Couplers
Authors: Wu Cheng-Siou , Chen Yu-Hsiang , Hsu Shih-Hsiang
Published: October 2023

A silicon-based bandwidth filter is used to compensate for the non-flat wavelength response of the silicon wire grating coupler and optical power coupler to achieve the best axial resolution of the spectral-domain optical coherence tomography.
Qualification of a Fiber Bragg Grating Temperature Sensor for Operation in a Nuclear Reactor Core
Authors: Berkovic G. , Zilberman S. , London Y. , Dadon M. , Shafir E. , Ozeri O. , Ben-Meir K. , Krakovich A. , Makmal T.
Published: October 2023

A Bragg grating inscribed on a radiation-hard fiber using a femtosecond laser and phase-mask showed very low (< 10 pm) wavelength shift when exposed to a very high ionizing radiation dose of 8 MGy in the core of a nuclear reactor. It was verified that this grating can accurately measure temperature under intense ionizing radiation.
Evaluation of the Durability of Fiber Bragg Grating Sensors in Lithium-Ion Pouch Cells Over Six Months
Authors: Unterkofler Johanna , Klambauer Reinhard , Bergmann Alexander
Published: October 2023

Temperature monitoring of lithium-ion batteries is very important because aging is temperature dependent. In this work, we integrated fiber B ragg g rating (FBG) sensors into a pouch cell and evaluated the stability of the sensitivity over a period of six months. The FBGs were calibrated once a month. Good stability of the fibers was found.
Dynamic Fiber Bragg Grating Sensors Interrogators on Silicon Chips
Authors: Di Pasquale F. , Elaskar J. , Faralli S. , Velha P. , Tozzetti L. , Bontempi F. , Ayaz R. M. A. , Oton C. J.
Published: October 2023

we overview the development of Fiber Bragg Grating sensor interrogators on silicon chips based on Mach-Zehnder interferometers and silicon micro-ring resonator filters. Different schemes are described to achieve fast dynamic strain measurement capabilities.
Study of Vertical Axis Wind Turbine Tower Bending Deformations Using FBG Sensors
Authors: Van Esbeen Bastien , Manto Valentin , Kinet Damien , Caucheteur Christophe
Published: October 2023

This paper presents experimental results of FBG sensors used for SHM of a vertical axis wind turbine tower. Thanks to power spectral density computations, three deformation types are detected, each characterized by a specific frequency.
Direct Measurement of Attosecond Emission Delays in High Harmonic Generation
Authors: Wyatt Adam S. , Lloyd David , Chapman Richard T , Thornton Christopher , Majchrzak Paulina , Jones Alfred , Springate Emma , O’Keeffe Kevin
Published: October 2023

We present direct measurements of attosecond delays in the emission of extreme ultraviolet pulses from high harmonic generation in different gases using an inline interferometer. Relative to argon, we measure a delay of -22 ± 8 as for krypton, -71 ± 8 as for xenon, 65 ± 3 as for nitrogen (N2) and 33 ± 3 as for carbon dioxide (both unaligned).
Dual-comb spectroscopy using free-running combs with digital phase correction
Authors: Tian Haochen , Li Runmin , Sterczewski Lukasz A. , Endo Takeru , Kato Takashi , Asahara Akifumi , Minoshima Kaoru
Published: October 2023

We realize dual-comb spectroscopy measurements using two types of free-running optical frequency combs, independent Yb:fiber combs with 750-MHz repetition rate and mechanical sharing Er:fiber combs with 51-MHz repetition rate. Assisted by all-computational digital phase correction techniques, the absorption features of gaseous cells are characterized with sufficient signal-to-noise ratio.
Direct reconstruction of two ultrashort pulses based on non-interferometric frequency-resolved optical gating
Authors: Seifert Birger , Rojas-Aedo Ricardo , Wheatley Robert Alastair , Hidalgo-Rojas Diego
Published: October 2023

We describe a non-interferometric ultrashort-pulse measurement technique based on frequency-resolved optical gating (FROG) with which pulses can be reconstructed directly, i.e. non-iteratively. With a single-shot FROG setup two different FROG spectrograms are measured, which represent the only information required to reconstruct the amplitudes and phases of two independent input pulses.
The secret recipe for passive CEP stabilization
Authors: Steinmeyer Günter , Schnürer Matthias , Ehrentraut Lutz , Maksimenka Raman , Forget Nicolas
Published: October 2023

We discuss the origin of residual carrier-envelope phase jitters in passively stabilized laser systems, comparing measured data at 9 different laser systems with a theoretical model. These considerations strongly suggest the Gordon-Haus jitter of the primary oscillator as the reason for the often observed excessive CEP jitters of these systems.
Waveform control of relativistic laser-matter interactions
Authors: Kaur Jaismeen , Ouillé Marie , Cheng Zhao , Haessler Stefan , Huijts Julius , Rovige Lucas , Vernier Aline , Andriyash Igor , Faure Jérôme , Lopez-Martens Rodrigo
Published: October 2023

We report on the first experimental evidence of direct waveform control of relativistic-intensity laser-plasma interactions driven by a kHz near-single-cycle laser source. We show how the driving laser waveform has a clear and reproducible imprint on the spatio-spectral emission properties of secondary particle and radiation beams from gas jets and plasma mirrors.
Ultrafast thin-disk laser oscillator exceeding 400 W average output power using a replicating cavity scheme
Authors: Seidel Moritz , Lang Lukas , Phillips Christopher R. , Keller Ursula
Published: October 2023

We demonstrate a modelocked thin-disk laser oscillator providing 410 W average power with a pulse duration of 751 fs at a repetition rate of 7.77 MHz. This is enabled by a replicating cavity scheme not demonstrated before in high-power or modelocked oscillator operation and the use of sapphire bonded SESAMs.
Argon ionization by laser of fundamental frequency and its second-harmonic: Phase delays
Authors: Arbó Diego G. , López Sebastián D.
Published: October 2023

The ionization phases from argon atoms subject to a linearly polarized laser field ( – ω2ω) setting are calculated. We find excellent agreement between our results and measured phase delays [L. J. Zipp et al, Optica 1, 361].
Controlled femtosecond pulse interference and combining with an ultrasonic Bragg grating
Authors: Yushkov Konstantin B. , Molchanov Vladimir Ya.
Published: October 2023

Interference of two femtosecond laser beams is a synchronous ultrasonic Bragg grating is studied experimentally. Initial phase of the ultrasound affects the interference pattern and energy distribution between two output beams. This phenomenon can be used for controlled coherent combining of two beams using a single Bragg cell.
CAPELLA: A light field synthesizer to generate unlimited tailored waveforms
Authors: Oliver Verónica , Kreiner Asger , Zhan Minjie , Cardenas Daniel , Pervak Vladimir , Goulielmakis Eleftherios , Guggenmos Alexander
Published: October 2023

CAPELLA – UltraFast Innovations' light field synthesizer – enables the shaping and sub-cycle control of multi-watt visible laser pulses to not only synthesize any electrical field waveform but also to generate pulses below 2 fs, the shortest ever generated by a commercial device.
Optically induced DC current in unbiased dielectrics and semiconductors - a straightforward nonlinear optical effect
Authors: Khurgin Jacob B
Published: October 2023

We demonstrate theoretically that when well-below-the-bandgap femtosecond optical pulses propagate through a dielectric or semiconductor, DC current and charges are produced even though no real carriers are excited in the bands. This theory is confirmed by recent experiments.
Robust GHz Repetition Rate Optical Frequency Combs
Authors: Droste Stefan , Timmers Henry , Attar Andrew , Hickstein Daniel , Newman Zach , Carlson David , Rudin Benjamin , Emaury Florian , Vogel Kurt , Knabe Kevin
Published: October 2023

We phase stabilize a 1 GHz optical frequency comb with a residual phase noise of <270 mrad [1kHz…1MHz] on both the carrier-envelope offset frequency (fceo) and the repetition rate, respectively. Detection of fceo is done with a packaged monolithic nanophotonics device using just 140 pJ of pulse energy. The SNR of the offset beat signal is 56 dB (100 kHz RBW).
Laser Ablation thresholds of thin Aluminium films
Authors: B J. Camilo Diaz , Ivanov Dmitry , Bilmes Gabriel M
Published: October 2023

We present an experimental and theoretical study of nanosecond and femtosecond laser ablation process of thin Al films. By using Laser Ablation Induced Photoacoustics (LAIP) we identify experimentally the laser ablation thresholds. Results were compared with computational simulations based in the Two Temperature Model and Molecular Dynamics (TTM-MD).
X-ray dose rate and spectral measurements from ultrafast laser-matter interaction
Authors: Mosel Philip , Sankar Pranitha , Appi Elisa , Jusko Christoph , Zuber David , Kleinert Sven , Düsing Jan , Mapa Jose , Dittmar Günter , Püster Thomas , Vahlbruch Jan-Willem , Morgner Uwe , Kovacev Milutin
Published: October 2023

Ultrashort laser-matter processing can potentially lead to hazardous X-ray emission. Starting with an overview on secondary sources, we study the dose rate and spectral emission with respect to different laser parameters available in ultrafast laboratories and for industrial laser systems. Our results indicate that annual irradiation limits are easily exceeded.
Spectral Broadening of mJ Pulses in a Compact convex-concave Multipass Cell in Ambient Air
Authors: Omar Alan , Vogel Tim , Hoffmann Martin , Saraceno Clara J.
Published: October 2023

We demonstrate spectral broadening of 2.1-mJ pulses at 100-kHz repetition rate to a spectral bandwidth of 24.5 nm, supporting 133-fs pulses with 96 % efficiency, in a compact convex-concave multipass cell operated in ambient air.
Tight Focusing in Air of a mJ-class Femtosecond Laser: A Radiation Safety Issue
Authors: Vallières Simon , Powell Jeffrey , Connell Tanner , Evans Michael , Fourmaux Sylvain , Payeur Stéphane , Lassonde Philippe , Fillion-Gourdeau François , MacLean Steve , Légaré François
Published: October 2023

We present a straightforward method to generate MeV-ranged high dose-rate electron beams in ambient air through the tight focusing of a mJ-class femtosecond laser. We demonstrate that relativistic intensities are reached through an intensity clamping suppression effect and that the technique is promising for performing FLASH radiation therapy.
Nonlinearity-tunable regenerative amplifier for ultrashort-pulse generation
Authors: Feng Chengyong , Holcomb Robert , Jenkins Gregory W. , Dorrer Christophe , Bromage Jake
Published: October 2023

We introduce cascaded quadratic nonlinearity inside a regenerative amplifier to allow cavity-net nonlinearity tunable in both magnitude and sign. By exploiting the regime with enhanced net positive nonlinearity, we demonstrate direct amplification of 10-µJ, 1.2-ps seed pulses to 0.5 mJ, 200 fs from a Yb:YAG thin-disk regenerative amplifier.
Spatiotemporal focusing and imaging of ultrafast laser pulses for rapid, continuous 3D nanoprinting
Authors: Somers Paul , Johnson Jason E. , Xu Xianfan
Published: October 2023

We use spatiotemporal focusing and imaging of ultrafast laser pulses to implement a projection two-photon polymerization process in a continuous fashion to fabricate complex 3D structures at a large print rate. Rapid fabrication of millimeter scale structures is achievable with this continuous, layer-by-layer projection two-photon process.
Independent insulin signaling modulators govern hot avoidance under different feeding states
Authors: Chiang Meng-Hsuan , Lin Yu-Chun , Chen Sheng-Fu , Lee Peng-Shiuan , Fu Tsai-Feng , Wu Tony , Wu Chia-Lin
Published: October 2023

Thermosensation is critical for the survival of animals. However, mechanisms through which nutritional status modulates thermosensation remain unclear. Herein, we showed that hungry Drosophila exhibit a strong hot avoidance behavior (HAB) compared to food-sated flies. We identified that hot stimulus increases the activity of α′β′ mushroom body neurons (MBns), with weak activity in the sated state and strong activity in the hungry state. Furthermore, we showed that α′β′ MBn receives the same level of hot input from the mALT projection neurons via cholinergic transmission in sated and hungry states. Differences in α′β′ MBn activity between food-sated and hungry flies following heat stimuli are regulated by distinct Drosophila insulin-like peptides (Dilps). Dilp2 is secreted by insulin-producing cells (IPCs) and regulates HAB during satiety, whereas Dilp6 is secreted by the fat body and regulates HAB during the hungry state. We observed that Dilp2 induces PI3K/AKT signaling, whereas Dilp6 induces Ras/ERK signaling in α′β′ MBn to regulate HAB in different feeding conditions. Finally, we showed that the 2 α′β′-related MB output neurons (MBONs), MBON-α′3 and MBON-β′1, are necessary for the output of integrated hot avoidance information from α′β′ MBn. Our results demonstrate the presence of dual insulin modulation pathways in α′β′ MBn, which are important for suitable behavioral responses in Drosophila during thermoregulation under different feeding states.