bluuebunny/crossref_metadata_2025 huggingface dataset:
Aflatoxin Detection in Individual Maize Kernels Using a Handheld Fluorescence Spectroscopy Device
Authors: Smeesters Lien , Kuntzel Thomas , Thienpont Hugo , Guilbert Ludovic
Published: October 2023

We present a non-destructive fluorescence sensing methodology, optimized for aflatoxin detection in individual food products, demonstrating a promising sensitivity by differentiating naturally-contaminated maize samples with an aflatoxin concentration difference of only 0.6 μg/kg.
Investigation of Ultra-Low Frequency Vibrational Modes of 2:1 Urea-Succinic Acid Cocrystals
Authors: Singh Khushboo , Bandyopadhyay Aparajita , Sengupta Amartya
Published: October 2023

The ultra-low frequency region provides both chemical and structural information of chemical compounds. Here, we have utilized Raman and terahertz time-domain spectroscopy to study the structural fingerprints of 2:1 urea-succinic acid cocrystals in this region.
Development and Production of Silicon Immersion Gratings for High-Resolution Infrared Spectroscopy
Authors: Brooks Cynthia B.
Published: October 2023

The University of Texas at Austin fabricates silicon grisms and silicon immersion gratings for astronomical and Earth science applications. These gratings are used in both space (JWST NIRCam) and ground-based (IGRINS, iSHELL, GMTNIRS) infrared spectroscopy. This technology allows us to design and build infrared spectrometers that are quite compact while covering a large spectral range at high resolution.
The Many Assets of Onboard Interferogram Principal Component Compression in Fourier Transform Spectrometry from Space
Authors: Dussarrat Pierre , Koyamatsu Shin , Deschamps Guillaume , Theodore Bertrand , Coppens Dorothee
Published: October 2023

An onboard interferogram compression, based on Principal Components (PC), is applied to a spaceborne FTS. On top of an impressive compression ratio of 10, the usage of PC permits the computation of the light power spectra without online Fourier transforms, an efficient detection of instrumental defects, their harmonization and automatic correction.
GHz repetition rate mid-infrared lasers for dual-comb spectroscopy
Authors: Hoghooghi Nazanin , Chang Peter , Egbert Scott , Burch Matt , Lynch Patrick , Diddams Scott , Rieker Gregory B.
Published: October 2023

We present 1 GHz repetition rate mid-infrared frequency combs with optical bandwidth > 30 THz and demonstrate their application to chemical kinetics studies in dual-comb configuration.
Frequency Domain Fluorescence Lifetime Imaging Microscopy (FD-FLIM) analysis of Quercus robur samples for origin differentiation purposes
Authors: Schwarz Jonas , Wohlschläger Maximilian , Leiter Nina , Auer Veronika , Risse Michael , Versen Martin
Published: October 2023

Increasing demand for wood products requires methods to determine its harvest origin and ensure sustainable and legal sourcing. In 15 out of 21 cases, the origin of Quercus robur was differentiable in FD-FLIM studies.
Measurement of Atmospheric Carbon dioxide using Hollow-core Absorption and Photoacoustic Spectroscopy with a Broadband Laser Source
Authors: K Saran Kumar , S Sooraj , Selvaraj Ramya , S Satyanarayanan , Vasa Nilesh J
Published: October 2023

Hollow-core fiber and photoacoustic spectroscopy techniques are demonstrated for the measurement of atmospheric CO2 using a broadband supercontinuum laser at 2 µm wavelength range. The CO2 concentration was measured during the day and night time, was found to be around 420 ppm and 450 ppm respectively.
Scanning Angle Expansion in FMCW LiDAR Sensor using Relay Lens System
Authors: Jung Dahun , Jung Min Uk , Kim Chang-Seok
Published: October 2023

In this research, we have proposed relay lens system expanding angle of the FMCW LiDAR sensor. By applying a relay lens system, we achieved angle expansion of sensor and wide-angle 3D images are obtained.
Compact Instrument for Relative Water Content Assessment in Holm Oak for Black Truffle Cultivation
Authors: Peguero-Pina José Javier , Gil-Pelegrin Eustaquio , Sancho-Knapik Domingo , Ruiz-Llata Marta
Published: October 2023

We present the design and implementation of an instrument for the assessment of the relative water content in tree leaves based on diffuse reflectance spectroscopy in the near infrared. Experimental results on holm oak leaves show promising results for irrigation optimization.
A network analysis optical frequency-domain reflectometer for distributed vibration sensing
Authors: Zahoor R. , Vallifuoco R. , Catalano E. , Bernini R. , Zeni L. , Minardo A.
Published: October 2023

We demonstrate the use of a network analysis optical frequency domain reflectometer for dynamic and distributed vibration sensing. Two configurations are assessed and compared, based on either double sideband or single sideband modulation.
Evaluation of low-cost sensing fibers in a fiber optic current sensor used for DC measurements in the power grid
Authors: Mandl Johannes , Trampitsch Philipp , Klambauer Reinhard , Bergmann Alexander
Published: October 2023

Two types of low-cost sensing fiber are evaluated in an inline fiber optic current sensor designated for use in the power grid. The fibers are investigated in terms of linear current response and sensitivity.
Submarine Landslide Monitoring System based on Optic Fiber Shape Sensor
Authors: Yang Yang , Cai Weikang , Kong Lingyu , Xu Jingping , Song Zhang qi
Published: October 2023

We developed a self-contained submarine landslide monitoring system based on optical fiber shape sensor and carried out a harbor experiment. It recorded whole process and results show it has good dynamic response characteristics and high stability.
Investigations on evanescent wave absorbance sensitivity of step-etched U-bent glass optical fiber sensor probes
Authors: Chaudhary Ratan Kumar , Manoharan Hariharan , Rajamani Allwyn S , Madaboosi Narayanan , Sai V. V. R.
Published: October 2023

In this study, step-etched U-bent glass optical fiber (600 µm core etched to ~ 200 µm) sensor probes with IgG loading efficiency show ~2-fold higher evanescent wave absorbance sensitivity at lower concentrations of IgG (1 µg/mL).
Innovative Uav Hyperspectral Application for Monitoring Microalgal Community in Brackish Environment: Lago Delle Nazioni (Ferrara, Italy) Case Study
Authors: Bentivogli Riccardo , Pezzolesi Laura , Costanzini Elisa , Caputo Nicolè , Giambastiani Beatrice M.S. , Silvestri Sonia
Published: October 2023

This study aims to develop an innovative hyperspectral application to monitor phytoplankton in brackish environments including laboratory calibration and data field validation. Results showed good correlation between algal blooms specific indexes and phytoplankton biomass.
Environmental Sensing and Localization via SOP Monitoring of IM-DD Optical Data Channels
Authors: Awad Hasan , Virgillito Emanuele , Straullu Stefano , Bratovich Rudi , Rodriguez Fransisco M. , Proietti Roberto , D’Amico Andrea , Aquilino Francesco , Pastorelli Rosanna , Curri Vittorio
Published: October 2023

We propose a low cost implementation of the state-of-polarization monitoring for environmental sensing on terrestrial telecommunication networks’ IM-DD optical signals. Experiment show feasibility of both event’s detection and localization with less than 100 meters accuracy.
Removing Bias in Dual-Comb Spectroscopy from Pipeline Analog to Digital Converter Conversion
Authors: Malarich Nathan A. , Giorgetta Fabrizio , Cossel Kevin , Washburn Brian R. , Genest Jerome , Newbury Nathan , Coddington Ian
Published: October 2023

We quantify the percent-level bias in dual-comb spectroscopy due to nonlinearities from the analog-to-digital conversion and demonstrate a compensation method to enable gas concentration measurements with 0.2% accuracy.
Development of polarization sensitive Fourier transform infrared spectroscopy
Authors: Zang Mengmeng , Liu Xin , Wang Ying , Wang Wei
Published: October 2023

In this paper, a new Fourier infrared polarization spectroscopy measurement system is proposed, which contains an experimental setup for obtaining the full polarization spectral information and the polarization spectrum recovery algorithm.
Ultrasensitive ultrasound detection using dissipative optical microcavities
Authors: Meng Jia-Wei , Tang Shui-Jing , Xiao Yun-Feng
Published: October 2023

We propose an ultrasensitive ultrasound sensor using the strong dissipative acousto-optic interaction between a whispering-gallery microcavity and a suspended vibrating microfiber. The sensitivity is demonstrated to be insensitive to Q factors.
Label-free Fiber-optic Biosensor for SARS-CoV-2 Spike Protein Detection with Ambient Temperature Measurement Capability
Authors: Bae Minchan , Choi Sungwook , Kim Jihoon , Seo Giwan , Lee Yong Wook
Published: October 2023

We propose a label-free fiber-optic biosensor capable of detecting SARS-CoV-2 spike protein and measuring ambient temperature using multi-mode interference and grating-resonance obtained using a no-core fiber and a long-period fiber grating inscribed on double-clad fiber.
Biomimetic Optical Sensor for Fluid Velocity Measurement
Authors: Seo Dongmin , Oh Sangwoo , Byun Sung-Hoon
Published: October 2023

To measure the underwater fluid velocity, we proposed a novel optical sensor mimicking the fish neuromast. The linearity of the applied force and the intensity of light in the fluorescence image was verified through experiments.
Non-Abelian gauge field in optics
Authors: Yan Qiuchen , Wang Zhihao , Wang Dongyi , Ma Rui , Lu Cuicui , Ma Guancong , Hu Xiaoyong , Gong Qihuang
Published: October 2023

Non-Abelian optics has emerged as a promising research field with the
potential to revolutionize our understanding of light–matter
interactions and enable new applications in areas including
topological photonic devices, quantum computing, optical sensing, and
communications. This review provides an overall framework for the
rapidly developing field of non-Abelian properties in optics,
including the basic concepts of non-Abelian optics, the physical
mechanism of non-Abelian statistics, the non-Abelian gauge field in
optics, non-Abelian braiding in optics as a special phenomenon of the
non-Abelian gauge field, and current challenges and opportunities.
This review is intended to provide a new perspective on non-Abelian
optics, summarize the current status and advanced progress in
non-Abelian gauge fields and braiding in optics, and stimulate dialog
about future perspectives.
Assessment of power spectral density of microvascular hemodynamics in skeletal muscles at very low and low-frequency via near-infrared diffuse optical spectroscopies
Authors: Amendola Caterina , Buttafava Mauro , Carteano Talyta , Contini Letizia , Cortese Lorenzo , Durduran Turgut , Frabasile Lorenzo , Guadagno Claudia Nunzia , Karadeniz Umut , Lacerenza Michele , Mesquida Jaume , Parsa Shahrzad , Re Rebecca , Sanoja Garcia Diego , Konugolu Venkata Sekar Sanathana , Spinelli Lorenzo , Torricelli Alessandro , Tosi Alberto , Weigel Udo M. , Yaqub M. Atif , Zanoletti Marta , Contini Davide
Published: October 2023

In this work, we used a hybrid time domain near-infrared spectroscopy (TD-NIRS) and diffuse correlation spectroscopy (DCS) device to retrieve hemoglobin and blood flow oscillations of skeletal muscle microvasculature. We focused on very low (VLF) and low-frequency (LF) oscillations (i.e., frequency lower than 0.145 Hz), that are related to myogenic, neurogenic and endothelial activities. We measured power spectral density (PSD) of blood flow and hemoglobin concentration in four muscles (thenar eminence, plantar fascia, sternocleidomastoid and forearm) of 14 healthy volunteers to highlight possible differences in microvascular hemodynamic oscillations. We observed larger PSDs for blood flow compared to hemoglobin concentration, in particular in case of distal muscles (i.e., thenar eminence and plantar fascia). Finally, we compared the PSDs measured on the thenar eminence of healthy subjects with the ones measured on a septic patient in the intensive care unit: lower power in the endothelial-dependent frequency band, and larger power in the myogenic ones were observed in the septic patient, in accordance with previous works based on laser doppler flowmetry.
Wavelength modulation spectroscopy for open-path drone-based methane detection
Authors: Kleemann Felix , Soskind Michael , Wysocki Gerard
Published: October 2023

In this work, we present results of a line-locked wavelength modulation spectroscopy system for stand-off methane detection with 0.8 ppm-m·Hz−1/2sensitivity, capable of simultaneous tracking of a flying drone with a retroreflector.
Planet’s Upcoming VIS-SWIR Hyperspectral Satellites
Authors: Joshua Max , Salvaggio Katie , Keremedjiev Mark , Roth Keely , Foughty Elizabeth
Published: October 2023

Planet is planning to launch a hyperspectral satellite constellation, named Tanager, in 2023 that will support applications across many sectors, including agriculture, energy, national security, mineral exploration and more. The presenter will provide background on the mission and capabilities of these upcoming VIS-SWIR satellites.
Field recovery from digital inline holographic images of composite propellant combustion base on denoising diffusion model
Authors: Xu Geng , Jin Bingning , Yang Siying , Liu Peijin
Published: October 2023

Digital inline holography has gained extensive application in the optical diagnosis of solid propellant combustion. However, this method confronts several challenges. Firstly, the calculation time required for reconstruction and depth of field extension is excessively long. Secondly, the excessive smoke, airflow, and flame during combustion cause significant interference and poor reconstruction quality, which reduces the accuracy of particle identification. To address these issues, we have developed a holographic image reconstruction technique for aluminum particle combustion based on the Attention Mechanism, U-net, and Diffusion models. This approach enables end-to-end reconstruction of aluminum particle combustion holographic images, while effectively circumventing the interference of airflow combustion and flame.
Towards “smart transceivers” in FPGA-controlled lithium-niobate-on-insulator integrated circuits for edge computing applications [Invited]
Authors: Bankwitz J. Rasmus , Dijkstra Jelle , Pradip Ravi , McRae Liam , Lomonte Emma , Lenzini Francesco , Pernice Wolfram H. P.
Published: October 2023

In the realm of advanced computing and signal processing, the need for
optimized data processing methodologies is steadily increasing. With
the world producing vast quantities of data, computing architectures
necessitate to be swifter and more energy efficient. Edge computing
architectures such as the NetCast architecture [1] combine the
strength of electronic and photonic computing by outsourcing
multiply-accumulate operations (MAC) to the optical domain. Herein we
demonstrate a hybrid architecture, combining the advantages of FPGA
data processing facilitating an ultra-low power electro-optical
“smart transceiver” comprised of a lithium-niobate on
insulator photonic circuit. The as-demonstrated device combines
potential GHz speed data processing, with a power consumption in the
order of 6.63 fJ per bit. Our device provides a blueprint of a unit
cell for a TFLN smart transceiver alongside a variety of optical
computing architectures, such as optical neural networks, as it
provides a low power, reconfigurable memory unit.
Simulation of a Large Dynamic Range Self-Referenced Plasmonic Metasurface Sensor based on Extra-Ordinary Transmission
Authors: Verma Sagar Kumar , Srivastava Sachin Kumar
Published: October 2023

An extra-ordinary transmission-based flexible plasmonic metasurface was simulated for self-referenced refractive index sensing. A refractive index sensitivity of 1139 nm/RIU and figure of merit of 386/RIU were achieved.
Data Analysis of Weak Raman Signals for the Trace Detection of Explosives
Authors: Köhntopp Anja , Dreier Lisa B. , Walter Arne , Kölbl Christoph , Duschek Frank
Published: October 2023

Rapid detection of solid explosives on surfaces using scanning Raman spectroscopy and data processing are presented. Analyzing the mean and the variance spectra of a small data set significantly increases the detection sensitivity.
Quantum-enhanced gas sensing with squeezed optical frequency combs
Authors: Belsley Alexandre
Published: October 2023

We propose a quantum-enhanced absorption spectroscopy method using bright squeezed frequency combs and predict an order-of-magnitude improvement beyond the standard quantum limit. This enables high-precision gas sensing with applications in industrial process and environmental monitoring.
High-frequency sound wave detection with ease-to-use fiber-ball lens
Authors: Kim Hansol , Jung Hongjae , Kim Yeeun , Jeong Yoonchan
Published: October 2023

We propose a fiber-ball lens-based high-frequency sound detection technique. Owing to the excellent coupling efficiency with external signals, we verify that its detection range can go up as high as 16 kHz.
Stability and Vibration Robustness of a Real-Time Synthetic Dispersion Interferometer
Authors: Uittenbosch Hugo , Lorbeer Raoul-Amadeus , Kliebisch Oliver , Mahnke Peter , Dekorsy Thomas
Published: October 2023

The phase stability and robustness against vibrations of a heterodyne two-arm dispersion interferometer with real-time digital demodulation is investigated. We assess the feasibility of this technique as a contact-free variometer for aerospace applications.
Intra-spectral temperature-compensated FBG sensors for hydrogen detection and beyond
Authors: Buchfellner F. , Bian Q. , Moos F. , Nicolai J. , Zhang F. , Hu W. , Yang M. , Koch A.W. , Roths J.
Published: October 2023

Intra-spectral referencing of the notch to the π-FBG envelope enables direct measurement and compensation of temperature within an FBG element. This enhances reliability and enables versatile real-field applications in H2 sensing and beyond.
Time-Expanded ΦOTDR System for Dynamic Curvature Sensing
Authors: Escobar-Vera Camilo , Soriano-Amat Miguel , Martins Hugo F. , Barrera David , Martin-Lopez Sonia , Gonzalez-Herraez Miguel , Fernández-Ruiz María R.
Published: October 2023

We present a curvature sensing scheme based on time-expanded phase-sensitive optical time domain reflectometry (TE-ΦOTDR) with 10cm resolution, 125m range and 50Hz sampling rate. The proposal fills a performance gap in fiber-based shape sensors.
QEPAS sensor with widely tunable IC-ECL for quasi-simultaneous monitoring of trace gases
Authors: Hoppe Morten , Tatenguem Herve , Aßmann Christian , Schmidtmann Sebastian , Honsberg Martin , Sacher Joachim R.
Published: October 2023

We report the application of QEPAS in combination with a widely tunable IC-based laser system for sequential quasi-simultaneous monitoring of trace gases. Tuning range, output power and detection rate requirements are met by our work.
Urolithiasis Detection with Enhanced Sensitivity using Time-Resolved Raman Spectroscopy
Authors: Thongrom Sukrit , Pengphorm Panuwat , Kanjanasakul Chanisa , Boonsri Chantira , Bejrananda Tanan , Daengngam Chalongrat
Published: October 2023

Time-resolved Raman spectroscopy was performed to identify the chemical composition of urinary sediment materials. Clear characteristic Raman peaks with fluorescence suppression and enhanced signal-to-noise ratios were obtained, which would aid the early diagnosis of urolithiasis.
Multi-wavelength Raman fiber laser for photoacoustic signal sensing of lipid
Authors: Park Sang Min , Bak Seongjin , Kim Gyeong Hun , Cho Soon-Woo , Kim Hyung-Hoi , Kim Yeong Jin , Kim Chang-Seok
Published: October 2023

We introduce a novel multi-wavelength pulsed Raman fiber laser capable of wavelength switching in the 1700 nm band by utilizing guided Raman scattering and synchronous pumping.
An Optical Fiber flow rate sensor using low cost LiDAR
Authors: Baron-Casique J. , Guevara-Hernandez S.D. , Alvarez-Chavez J.A. , Mejia-Vega O.A. , Hernandez-Garcia J.C. , Ramirez-Paredes J.P. , Jauregui-Vazquez D.
Published: October 2023

This work demonstrates a drip rate optical fiber sensor based on LiDAR. The system provides simple intensity demodulation for accurate and real-time drip monitoring.
Fiber Optic Shape Sensing Based on Eccentric FBGs and Deep Learning
Authors: Roodsari Samaneh Manavi , Angelmahr Martin , Schade Wolfgang , Cattin Philippe C.
Published: October 2023

This paper presents the design of an accurate and low-cost single-core fiber shape-sensing solution using eccentric FBGs. We developed a deep learning model that considers the sensor's full spectrum and successfully predicts its shape deformations.
Design of Total Temperature Probe for High-Speed Airflow Based on Fiber Bragg Grating
Authors: Han Guoqing , Liu Xianming , Zhang Peng , Lei Xiaohua
Published: October 2023

With conjugate heat transfer of total temperature probe and spectral analysis of fiber Bragg grating, the design of a total temperature probe based on 1mm-long tip FBG is realized, with recovery factor of 0.90.
Plasma Diagnostics with THz Lasers
Authors: van Helden Jean-Pierre H. , Wubs Jente R. , Macherius Uwe , Lü Xiang , Röben Benjamin , Biermann Klaus , Schrottke Lutz , Grahn Holger T , Weltmann Klaus-Dieter
Published: October 2023

Terahertz (THz) spectroscopy is a powerful diagnostic for investigating numerous parameters in plasmas. In this contribution, the possibilities and limitations of newly developed THz quantum cascade lasers for measurements in plasmas will be discussed.
Spatially- and Spectrally-Resolved Structures in High Harmonic Generation from Solids
Authors: Wyatt Adam S. , Kowalczyk Katarzyna M. , Allegre Hortense , Springate Emma , Tisch John W. G. , Marangos Jon P. , Matthews Mary
Published: October 2023

We present spatially- and spectrally-resolved measurements of high harmonic generation in MgO and sapphire from 30 fs pulses at 780 nm. We show ring-like features that are distinctly different to gas-phase HHG. The harmonic yield shows harmonic independent 4-fold rotational symmetry from MgO and harmonic dependent 6-fold symmetry in sapphire.
Isosteric molecules in the time-domain
Authors: Pollanka M. , Schröder C. A. , Mittermair M. , Duensing A. , Kienberger R.
Published: October 2023

Photoemission timing measurements are performed on isosteric molecules in the gas phase on attosecond timescales. Comparing the photoemission time delay between the σ and π orbitals in the inner and outer valence states of CO2 and N2O leads to a deeper insight into the characteristics of isosterism in the time-domain.
Waveform characterization of synchrotron light using spectral phase interferometry for direct electric-field reconstruction
Authors: Fuji Takao , Kaneyasu Tatsuo , Fujimoto Masaki , Okano Yasuaki , Salehi Elham , Hosaka Masahito , Takashima Yoshifumi , Mano Atsushi , Hikosaka Yasumasa , Wada Shin-ichi , Katoh Masahiro
Published: October 2023

Ultraviolet and extreme ultraviolet electric-fields generated from a synchrotron light source are characterized by using spectral phase interferometry for direct electric-field reconstruction. The reconstructed 10-cycle square envelope electric-field corresponds to the radiation from an electron accelerated with the undulator which consists of 10 periods of permanent magnets.
Single-shot cross-correlation of counter-propagating, short optical pulses using random quasi-phase-matching
Authors: Dorrer C. , Shaw J. L.
Published: October 2023

We demonstrate a single-shot cross-correlator based on the transverse sum-frequency generation of counter-propagating pulses in a disordered ferroelectric crystal. It measures the cross-correlation between the two laser pulses, leading to the relative delay between two facilities on every shot for co-timing and study of their relative jitter.
Complete Characterization of an OPCPA at High Repetition Rate Using Frequency Resolved Optical Switching
Authors: Haddad Elissa , Longa Adrien , Lassonde Philippe , Leblanc Adrien , Ibrahim Heide , Légaré François , Jargot Gaëtan
Published: October 2023

We show that frequency resolved optical switching (FROSt) can be used for full characterization of high repetition rate optical parametric chirped-pulse amplifiers (OPCPA). We characterize supercontinuum seed pulses at up to 500 kHz followed by the tunable near-infrared output signal and idler, simultaneously, of an ytterbium-based OPCPA system.
High Repetition Rate, High Energy Petawatt Laser for the Matter in Extreme Conditions Upgrade
Authors: Spinka Thomas M. , Albrecht MariAnn , Alessi David , Ammons S. Mark , Barillas Cris , Batysta František , Buckley Brandon , Chemali Alex , Clark Erin , Davila Edwin , Deri Robert J. , Eseltine Kevin , Fishler Barry , Fulkerson E. Steve , Galbraith Justin , Galvin Thomas , Gonzales Anthony , Gopalan Vinod , Herriot Sandrine , Jimenez Jessica , Kiani Leily , Koh Ed , Kupfer Rotem , Liao Zhi , Lusk Jeremy , Nguyen Hoang , Patel Ashay , Peer Aaron , Peterson John , Plummer Robert , Reagan Brendan A. , Schaffers Kathleen , Sistrunk Emily , Tamer Issa , Tang Vincent , Telford Steve , Terzi Kenneth , Utley Pamela , Velas Katherine M. , Vella Anthony , Wong J. Nan
Published: October 2023

The Matter in Extreme Conditions Upgrade (MEC-U) project will combine a hard x-ray free electron laser with high-power optical lasers to produce and understand matter found in extreme environments. We are developing a 10 Hz, 150 J, 150 fs, 1PW laser system to be installed in this upgraded facility.
Ultrafast laser writing tool kit for quantum technologies
Authors: Coccia Giulio , Shahbazi Sajedeh , Kuriakose Akhil , Guo Yanzhao , Giakoumaki Argyro N. , Bharadwaj Vibhav , Koch Mihael K. , Hoese Michael , Jedrkiewicz Ottavia , Barclay Paul E. , Hadden JP , Bennett Anthony J. , Olivero Paolo , Ramponi Roberta , Kubanek Alexander , Eaton Shane M.
Published: October 2023

The possibility to develop room-temperature quantum sensors by focusing ultrashort laser pulses inside the bulk of diamond is introduced. A systematic study of the laser fabrication parameters is presented, leading to the enhanced sensitivity of quantum sensing devices in diamond.
Two-color femtosecond laser beam shaping with independent wavelength and spatial frequency tuning
Authors: Obydennov Dmitry V. , Yushkov Konstantin B. , Molchanov Vladimir Ya.
Published: October 2023

Two-color laser system with independent tunable generation of ring-shaped beams is demonstrated. The setup is based on a Ti:sapphire laser and acousto-optic filters for wavelength tuning and spatial domain laser beam shaping. The system can be used as a laser source for advanced atom traps.
Taking ultrafast microscopy to widefield with off-axis holography
Authors: Hörmann Martin , Visentin Federico , Zanetta Andrea , Osmond Johann , Grancini Giulia , van Hulst Niek F. , Liebel Matz , Cerullo Giulio , Camargo Franco V. A.
Published: October 2023

Since cameras are too slow for shot-to-shot acquisition, pump-probe microscopy was limited to single-point detection. We demonstrate widefield pump-probe images spanning 100×100 μm2 using an all-optical lock-in camera based on off-axis holography. We use it to study exciton diffusion in perovskites around 100 diffraction-limited spots.
Shorter Duration Ultrafast Electro-optic Frequency Combs via Multi-Wavelength Seeding
Authors: Seggebruch Michael W. L. , Barty C. P. J.
Published: October 2023

Electro-optic frequency comb compressed pulse durations scale by ~1/n for modulators optimally seeded with n optical carrier frequencies. Uniform, ultrafast pulses with multi-GHz repetition rates are obtainable if the resulting adjacent frequency combs are phase locked, frequency locked, and compressed with a liquid crystal spatial light modulator.
Study of acoustic phonon propagation by femtosecond ellipsometry
Authors: Espinoza Shirly , Gutiérrez Yael , Cueff Sébastien , Khakurel Krishna P. , Miranda Saul Vazquez- , Zahradník Martin , Rebarz Mateusz , Andreasson Jakob
Published: October 2023

Acoustic phonons are generated by the arrival of a femtosecond laser pulse to the surface of a material. By femtosecond pump-probe ellipsometry on thin films and bulk materials, we could discern between different types of transient phenomena including the ones due to the propagation of these photo-induced acoustic waves.
Simulations and Measurements for Signatures of Spatio-Temporal Couplings in Laser Fields
Authors: Talposi Anda-Maria , Matei Dan-Gheorghita , Iancu Vicentiu , Ursescu Daniel
Published: October 2023

The propagation behaviour of spatio-temporal couplings in ultra-short lasers was simulated using an in-house, mesh-free, 4D Gaussian decomposition propagation code. An expository example is the generation of spatial chirp in the focus of a laser with initial angular dispersion, affecting the laser experiments. Simulations were supported by laboratory measurements.
Ultrafast Laser Systems for High Repetition Rate Seeded Soft X-Ray Free Electron Laser Facility FLASH
Authors: Hartl Ingmar , for the FLASH2020+ team
Published: October 2023

The free electron laser facility FLASH will be the first externally seeded soft x-ray free electron laser worldwide. We describe the ultrafast laser systems which are currently under construction to operate this facility.
Few-cycle Yb laser source at 20 kHz using multidimensional solitary states in hollow-core fibers
Authors: Longa A. , Arias L. , Jargot G. , Pomerleau A. , Lassonde P. , Fan G. , Safaei R. , Corkum P. B. , Boschini F. , Ibrahim H. , Légaré F.
Published: October 2023

We demonstrate pulse compression from 300 fs down to 17 fs up to 20 kHz using multidimensional solitary states in a hollow-core fiber filled with N2O in differential pressure to mitigate thermal effects.
Mid-infrared hyper spectral imaging using sub-half-cycle pulses
Authors: Zhao Yue , Kusama Shota , Furutani Yuji , Huang Wei-Hong , Luo Chih-Wei , Fuji Takao
Published: October 2023

Here we report a mid-infrared chemical imaging using chirped pulse upconversion of sub-half-cycle pulses. The spatial resolution is 15 µm and a 640×480 pixel image can be obtained in 8 s at the hyperspectral imaging, which covers a spectral range of 640–3015 cm−1 with a wavenumber resolution of ∼3 cm−1.
Efficient and broadband mid-infrared source based on optical parametric amplification in dispersion-engineered thin film Lithium Niobate
Authors: Hamrouni M. , Hwang A. , Jankowski M. , Jornod N. , Mishra J. , Stokowski H. S. , McKenna T. P. , Langrock C. , Südmeyer T. , Safavi-Naeini A. H. , Fejer M. M.
Published: October 2023

We report on a novel approach for efficient and broadband mid-infrared generation at the picojoule level of pump pulse energies. Driving OPA in thin-film-lithium-niobate waveguides with sub-10-pJ on-chip pump pulse energies, we demonstrate 1.5-pJ idler pulses with 150 µW average power within a 140-nm broad spectrum centered at 3200 nm.
High-power few-cycle pulses at 12 µm for ultrafast nonlinear spectroscopy
Authors: Fuertjes Pia , Bock Martin , Griebner Uwe , Elsaesser Thomas
Published: October 2023

A GaSe-based optical parametric chirped pulse amplifier (OPCPA) seeded by a femtoseconde Cr:ZnS oscillator delivers pulses at 11.4 µm with 185 fs duration, an energy of 65 µJ at a 1-kHz repetition rate, and is applied for nonlinear transmission experiments of liquid water.
Optical rectification using thin lithium niobate inside a high-power thin-disk laser
Authors: Wang Yicheng , Mansourzadeh Samira , Vogel Tim , Saraceno Clara J.
Published: October 2023

We demonstrate thin-disk oscillator driven extra/intracavity optical rectification using 50-µm thin LiNbO3. In extracavity conditions, THz transients with average power up to 600 µW were achieved with a spectrum extending up to 5 THz. By placing the LN crystal inside a Kerr-lens modelocked thin-disk oscillator, THz average power up to 1.2 mW was achieved.
Absolute distance measurement based on a coherently synthesized two-color electro-optic frequency comb
Authors: Li Runmin , Tian Haochen , Kato Takashi , Asahara Akifumi , Minoshima Kaoru
Published: October 2023

A low-noise coherently synthesized two-color EO comb is demonstrated and applied for distance measurement. Nanometer-precision absolute distance measurement within extended non-ambiguity range is realized by combining synthetic-wavelength interferometry and single-wavelength interferometry.
Impact of COVID-19 on the mental health of men experiencing homelessness: A cross-sectional study in Osaka, Japan
Authors: Michinaka Masahiro , Sai Akira , Yamauchi Taro
Published: October 2023

The novel coronavirus infectious disease (COVID-19) pandemic has negatively impacted not only our physical health but also mental health, including increasing depressive and anxiety symptoms. In particular, socially and physically vulnerable populations, such as people experiencing homelessness (PEH), may be more likely to have their mental health worsened by the pandemic due to having more difficulty meeting basic human needs. Therefore, this study aims to assess the impact of COVID-19 on mental health of the homeless in Japan by evaluating depressive and anxiety symptoms and identifying the associated factors particularly, sociodemographic variables as age, employment status and the fear and perceived risk of COVID-19 infection. A cross-sectional interview survey among 158 PEH in Osaka Prefecture was conducted from April to May 2022. The survey included sociodemographic questions and history and perceived risk of infection with COVID-19. Depressive symptoms were measured using the nine-item Patient Health Questionnaire (PHQ-9) and anxiety symptoms using the seven-item Generalized Anxiety Disorder Scale (GAD-7), and the fear of COVID-19 using the seven-item Fear of New Coronavirus Scale (FCV-19S). In this study, the prevalence of depression (PHQ-9≥10) was 38.6%, anxiety disorder (GAD≥10) was 19.0%, and high fear of COVID-19 (FCV-19S≥19) was 28.5%. Univariate logistic regression analysis revealed that PEH in younger age groups (18–34 years), and with joblessness, higher perceived infection risk, and higher fear of COVID-19 were more likely to suffer from depression and anxiety (p<0.05). These results indicate that the younger PEHs with worsened economic conditions and therefore, feel threatened by COVID-19 the pandemic are at higher risk of mental health deterioration. More focused research and mental health services need to be provided to this population in the future.
Automation protocol for high-efficiency and high-quality genomic DNA extraction from Saccharomyces cerevisiae
Authors: Alperovich Nina , Scott Benjamin M. , Ross David
Published: October 2023

Although many protocols have been previously developed for genomic DNA (gDNA) extraction from S. cerevisiae, to take advantage of recent advances in laboratory automation and DNA-barcode sequencing, there is a need for automated methods that can provide high-quality gDNA at high efficiency. Here, we describe and demonstrate a fully automated protocol that includes five basic steps: cell wall and RNA digestion, cell lysis, DNA binding to magnetic beads, washing with ethanol, and elution. Our protocol avoids the use of hazardous reagents (e.g., phenol, chloroform), glass beads for mechanical cell disruption, or incubation of samples at 100°C (i.e., boiling). We show that our protocol can extract gDNA with high efficiency both from cells grown in liquid culture and from colonies grown on agar plates. We also show results from gel electrophoresis that demonstrate that the resulting gDNA is of high quality.
Advance directives among community-dwelling stroke survivors
Authors: Gupta Soumya , Chen Bridget J. , Suolang Deji , Cooper Rachel , Faigle Roland
Published: October 2023

Objective

Advance directives (ADs) are integral to health care, allowing patients to specify surrogate decision-makers and treatment preferences in case of loss of capacity. The present study sought to identify determinants of ADs among stroke survivors.

Methods

In this cross-sectional study (Care Attitudes and Preferences in Stroke Survivors [CAPriSS]), community-dwelling stroke survivors were surveyed on ADs; validated scales were used to query palliative care knowledge and attitudes towards life-sustaining treatments. Logistic regression was used to determine variables associated with ADs.

Results

Among 562 community-dwelling stroke survivors who entered the survey after screening questions confirmed eligibility, 421 (74.9%) completed survey components with relevant variables of interest. The median age was 69 years (IQR 58–75 years); 53.7% were male; and 15.0% were Black. Two hundred and fifty-one (59.6%) respondents had ADs. Compared to stroke survivors without ADs, those with ADs were more likely to be older (median age 72 vs. 61 years; p<0.001), White (91.2% vs. 75.9%, p<0.001), and male (58.6% vs. 46.5%, p = 0.015), and reported higher education (p<0.001) and income (p = 0.011). Ninety-eight (23.3%) participants had “never heard of palliative care”. Compared to participants without ADs, participants with ADs had higher Palliative Care Knowledge Scale (PaCKS) scores (median 10 [IQR 5–12] vs. 7 [IQR 0–11], p<0.001), and lower scores on the Attitudes Towards Life-Sustaining Treatments Scale (indicating a more negative attitude towards life-sustaining treatments; median 23 [IQR 18–28] vs. 29 [IQR 24–35], p<0.001). Multivariable logistic regression identified age (OR 1.62 per 10 year increase, 95% CI 1.30–2.02; p<0.001), prior advance care planning discussion with a physician (OR 1.73, 95% CI 1.04–2.86; p = 0.034), PaCKS scores (OR 1.06 per 1 point increase, 95% CI 1.01–1.12; p = 0.018), and Attitudes Towards Life-Sustaining Treatments Scale scores (OR 0.91 per 1 point increase, 95% CI 0.88–0.95; p<0.001) as variables independently associated with ADs.

Conclusions

Age, prior advance care planning discussion with a physician, palliative care knowledge, and attitudes towards life-sustaining treatments were independently associated with ADs.
Diverse instrument symphonic ensembles: Making sustainable music amid unsustainable situations
Authors: Palamara Jason
Published: October 2023

Music technology-focused ensembles such laptop orchestras have become mainstays at higher education institutions. Nevertheless, the perpetual innovation inherent in the mandate of such a group presents some unique challenges in the post-pandemic academic landscape. In the post-COVID period of supply chain breakdowns and budget-obsessed administrations, building an ensemble focused on technology may become prohibitively expensive. As traditional music departments struggle with lower enrolment, expanding large ensembles to include a more diverse corpus of instruments would solve multiple problems. Assuming the challenges inherent in starting such groups could be overcome, ensembles that expand their instrumental diversity could allow for innovative study, increase enrolment and even save the host institution much-needed funds. The author groups extant technology-focused musical ensembles into categories by their focus and then proposes a novel category featuring intentionally diverse instrumentation, which may solve many of the problems associated with funding such groups while increasing and diversifying enrolment.
Una metodología de la Administración pública para innovar en la empresa privada
Authors: Díaz Pacheco María Victoria , García Pérez María Dolores , Martínez del Vas Ginesa
Published: October 2023

Introduction/Objective: Fostering the competitiveness of the industrial fabric from innovation is a challenge that is taken on by the public administration, to guarantee the development of business environments that do not have well-defined processes that allow them to correctly manage said innovation. The research presented shows how said administration behaves as an innovation catalyst that, by innovating, is capable of promoting a framework of confluence between public-private actors that cooperate to co-create a new management model that helps the company to systematize innovation with quality levels accepted by the participants and that promotes an innovative culture in the company. Methodology: The Administration is going to innovate to use co-creation as the central axis to generate a new innovation management model, with a “learning by doing” procedure that helps companies acquire these routines and protocols to be able to adapt to change and to create an innovative culture. Results: A minimum viable product of the new management model developed, which included a process with 4 phases, each phase lasting 6 months, reinforced with a series of support services and work tools. Conclusions: The development of an innovation process led from public management has been shown, which through the exercise of co-creation has been able to promote public-private collaboration of the different actors in the innovation ecosystem on a regional scale. Thus, it has given rise to a model capable of systematizing the management of innovation in the business fabric, motivating its competitiveness.
Acciones y métodos como base para una gobernanza periurbana
Authors: Villar Lozano Mayerly Rosa , Domínguez-Doménech Pablo Tomás , Cruz Paula Daniela
Published: October 2023

Para abordar el problema de la gobernanza periurbana, es relevante comprender la ocupación informal de las áreas periurbanas como génesis del desequilibrio territorial. Sobre este vale precisar que, en el caso de las ciudades latinoamericanas y, particularmente, de la ciudad colombiana, se gesta en el nacimiento de las urbes bajo dinámicas e intereses que constituyen un modelo de ocupación con base en el potencial de explotación de recursos, lo que trae consigo la conformación acelerada de nodos urbanos en los que, por su primacía, no solo se concentra una basta población, sino la oferta de bienes, servicios e imaginarios vinculados al progreso y el bienestar (Zambrano & Bernard, 2014, pp. 16-20). Esto, como consecuencia, fortalece la “dicotomía entre campo y ciudad que concentra la hegemonía cultural, económica y política en los principales nodos urbanos socavando con ello la cultura rural y la riqueza social del campo” (Ardila & Vergara, 2012, pp. 83-85), con la respectiva pérdida de la vocación y uso productivo de la tierra, factor que se suma a las diversas causas de migración masiva hacia las ciudadesm, en la búsqueda de alternativas productivas y oportunidades de movilidad social que el campo no ofrece.
La realidad del borde periurbano, Caso mexicano: Puerto Vallarta, Zona del Coapinole
Authors: González Alberto Reyes , Reyes González Andrés Enrique , Odetti Jimena
Published: October 2023

En el proceso de definición de estudios urbanos es necesario establecer algunos elementos conceptuales, los cuales puedan orientar el análisis territorial a través de la utilización de variables cualitativas y cuantitativas, que en algunas partes del proceso suelen ser elementos fundamentales para la construcción de cartografías urbanas. Este estudio se centró en dos elementos principales, la marginación y la identificación de los stakeholders. Estos agentes se plantean en un mismo elemento territorial, el cual se denominó Centralidad del Coapinole. Para el análisis de Puerto Vallarta se estableció un modelo de interpretación territorial policentral. La identificación de las zonas marginadas en la zona metropolitana de Puerto Vallarta se concentran principalmente en las zonas de montaña, alejadas del recurso turístico: la playa; se procedió a generar un análisis de las bases de datos que produjo el Instituto Nacional de Estadística y Geografía (INEGI) en el año 2010; a su vez se hizo un análisis de los datos contenidos en la Metodología para Identificación de Marginación Urbana realizada por el Consejo Nacional de Evaluación de la En este estudio se seleccionaron dos elementos para su análisis. El primero se refiere a la cantidad de población que presenta algún grado de marginación dentro de la zona metropolitana, junto con su distribución porcentual. El segundo elemento son las Áreas Geoestadísticas Básicas (AGEBS) que se incluyeron en el análisis, permitiendo comprender su distribución porcentual según su grado de marginación. En ambos análisis se mantuvo la ponderación establecida por CONEVAL (2010) (Reyes y Baños, 2022, p. 224).
Caso argentino: Salta
Authors: Polliotto Gabriela Alejandra , Ulivarri Paula , Clark Amelia , Reyes Gabriela Leonor
Published: October 2023

Salta es una ciudad del norte de Argentina, capital de la provincia del mismo nombre. Según datos del censo 2010, posee una población de 533.303 habitantes, lo quela convierte en la ciudad más poblada de la provincia, la segunda del Noroeste Argentino (NOA) y la séptima del país. El espacio territorial y caso de estudio se encuentra ubicado en la zona sudeste de la ciudad de Salta Capital y comprende los barrios populares denominados Ampliación 20 de Junio y Tinkunaku (Figuras 42 y 43). El área se caracteriza por su cercanía con el canal Tinkunaku, con el río Arenales y con el Parque Industrial.
The geometry of discrete L-algebras
Authors: Rump Wolfgang
Published: October 2023

The relationship of discrete L-algebras to projective geometry is deepened and made explicit in several ways. Firstly, a geometric lattice is associated to any discrete L-algebra. Monoids of I-type are obtained as a special case where the perspectivity relation is trivial. Secondly, the structure group of a non-degenerate discrete L-algebra X is determined and shown to be a complete invariant. It is proved that X ∖ {1} is a projective space with an orthogonality relation. A new definition of non-symmetric quantum sets, extending the recursive definition of symmetric quantum sets, is provided and shown to be equivalent to the former one. Quantum sets are characterized as complete projective spaces with an anisotropic duality, and they are also characterized in terms of their complete lattice of closed subspaces, which is one-sided orthomodular and semimodular. For quantum sets of finite cardinality n > 3, a representation as a projective space with duality over a skew-field is given. Quantum sets of cardinality 2 are classified, and the structure group of their associated L-algebra is determined.
‘Left-Kantianism’ and the ‘Scientific Dispute’ between Rudolf Stammler and Hermann Cohen
Authors: Widmer Elisabeth
Published: October 2023

This paper argues that the ‘scientific dispute’ between Hermann Cohen and Rudolf Stammler is symptomatic of a philosophical movement of left-wing Kant interpretations at the turn of the twentieth century. By outlining influential predecessors that shaped Cohen’s and Stammler’s thinking, I show that their Kantian justifications of socialism differ regarding their conception of law, history, and the political implications that follow from their practical philosophies. Against scholars who suggest that the Marburg School’s view on socialism was a coherent school of thought, I introduce the concept of ‘left-Kantianism’ as an open term that includes a wide variety of novel socialist approaches to Kant at the time.