Search query: DBR laser perovskite

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abstract: Single mode ridge waveguide semiconductor lasers based on AlGaAs/GaAs/InGaAs heterostructure with a surface distributed Bragg reflector were developed. Calculation of reflection spectrum based on coupled mode theory was carried out. Waveguide ridge with width of 5 mkm and Bragg grating with a period of 2 mkm was formed in the upper cladding layer by contact photolithography. Experimental studies shown that spectrum width did not exceed 0.3 nm both at continuous wave and pulse of 100 ns pump. Temperature stability of emission wavelength increased up to 0.075 nm/C.
author_names: Vasilii V Zolotarev

A V Rozhkov

A Yu Leshko

Sergey O Slipchenko

Nikita A Pikhtin

P S Kopev
title: Single mode narrow spectrum DBR laser (1040nm)
venue: 2020 International Conference Laser Optics (ICLO)
year: 2020

abstract: In this paper we present various configurations of erbium DBR lasers based on seven core fiber. By using femtosecond writing technique, it is possible to fabricate fiber Bragg gratings (FBGs) in selected cores of multicore fibers (MCF) at a certain transverse and longitudinal locations in a fiber, thus allowing for fabrication of advanced reflecting elements. Different schemes of tunable lasers are presented based on both uniform and chirped FBGs.
author_names: Alexandr V Dostovalov

Alexey A Wolf

Mikhail I Skvortsov

Kseniya V Proskurina

Sergey A Babin
title: Wavelength tunable DBR fiber laser based on multicore fiber
venue: 2020 International Conference Laser Optics (ICLO)
year: 2020

abstract: Abstract Organic inorganic hybrid perovskite semiconductors as gain materials have been widely investigated in various lasing structures. Here, we construct a vertical cavity surface emitting deep blue laser device in one step. A high quality CH3NH3PbCl3 single crystalline film as gain material is in situ grown in solution confined between a pair of distributed Bragg reflectors, which naturally form an optical microcavity. The thickness of the perovskite film can be easily adjusted from submicron to several microns by changing the applied pressure on the substrates. At room temperature, the resulting device can lase in a range of 414 435 nm when pumped by an 8 ns pulsed semiconductor laser diode, exhibiting a typical threshold of 211 mJ/cm2. The lasing wavelength and the number of modes are tunable due to the adjustable thickness of the perovskite film.
author_names: Cheng Tian

Shiqi Zhao

Tong Guo

Wanjin Xu

Yanping Li

Guangzhao Ran
title: Deep blue DBR laser at room temperature from single crystalline perovskite thin film
year: 2020

abstract: Lead halide perovskites have emerged as excellent optical gain materials for low cost and flexible lasers. Recently, continuous wave (CW) optically driven lasing was established in perovskite crystals; however, the mechanism of low threshold operation is still disputed. In this study, CW pumped lasing from one dimensional CsPbBr3 nanoribbons (NBs) with a threshold of ~130 W cm 2 is demonstrated, which can be ascribed to the large refractive index induced by the exciton polariton (EP) effect. Increasing the temperature reduces the exciton fraction of EPs, which decreases the group and phase refractive indices and inhibits lasing above 100 K. Thermal management, including reducing the NB height to ~120 60 nm and adopting a high thermal conductivity sink, e.g. sapphire, is critical for CW driven lasing, even at cryogenic temperatures. These results reveal the nature of ultralow threshold lasing with CsPbBr3 and provide insights into the construction of room temperature CW and electrically driven perovskite macro/micro lasers.
author_names: Qiuyu Shang

Meili Li

Liyun Zhao

Dingwei Chen

Shuai Zhang

Shulin Chen

Peng Gao

Chao Shen

Jun Xing

Guichuan Xing

Bo Shen

Xinfeng Liu

Qing Zhang
title: Role of the Exciton Polariton in a Continuous Wave Optically Pumped CsPbBr3 Perovskite Laser.
venue: Nano letters
year: 2020

abstract: We fabricated a Yb doped yttrium aluminium garnet (Yb:YAG) crystal derived silica fiber (YCDSF) using an assembly consisting of a YAG crystal rod and silica tube on a CO2 laser heated drawing tower. The fiber has a Yb concentration of 5.66 wt% and absorption coefficient of 32 dB/cm at 980 nm. The figure of merit of the unsaturated absorption and gain per unit length of the YCDSF are 93% and 4.4 dB/cm, respectively. Based on the results of the numerical simulation, an all fiber distributed Bragg reflector (DBR) laser using only a 1.5 cm long YCDSF is experimentally demonstrated to have a maximum output power of 360 mW with a pump threshold power of 21 mW. The fiber laser also achieved an optical signal to noise ratio of 80 dB, a beam quality factor of 1.022 in two orthogonal directions and a slope efficiency of up to 50.5% These results indicate that the all fiber DBR laser has potential applications in high quality seed sources and coherent optical communications.
author_names: Ying Wan

Jianxiang Wen

Yanhua Dong

Chen Jiang

Ming Jia

Fengzai Tang

Na Chen

Ziwen Zhao

Sujuan Huang

Fufei Pang

Tingyun Wang
title: Exceeding 50% slope efficiency DBR fiber laser based on a Yb doped crystal derived silica fiber with high gain per unit length.
venue: Optics express
year: 2020

abstract: We demonstrate a low concentrated solar pumped laser (SPL) with natural sunlight by using an all inorganic cesium lead halide perovskite (CsPbBrxI3 x) nanocrystal (NC) dispersed in toluene as a sensitizer. The perovskite NCs exhibit substantial advantages for SPL applications because of their broad absorption and narrow photoluminescence (PL) spectra with high quantum yield using inexpensive commercial precursors. We successfully synthesized CsPbBrxI3 x NCs with precisely tuned PL wavelengths from 581 to 612 nm by altering the I/Br ratio to achieve spectral overlap with Nd3+ ions, which have been widely used as a laser medium for SPLs. The measurement results show that the laser output power is highly sensitive to the peak PL wavelength of the NCs, and the highest laser output was obtained at the peak wavelength of 595 nm. Although the synthesized NCs have a wider absorption band, the laser output power obtained was much less than that of an organic dye of rhodamine 6G (R6G) The numerical analyses show that the optimal peak PL wavelength is 10 nm shorter than the absorption peak of Nd3+ ions because of the reflection property of the dichroic mirror coated on the input window. Moreover, we found that the concentration of NCs needs to be optimized in response to the peak PL wavelength. The calculations show that a laser output power 2.7 times greater than that of R6G can be obtained under an optimal peak PL wavelength of 575 nm and a concentration of 24 g/l for the CsPbBrxI3 x NCs.
author_names: Taizo Masuda

Yaohong Zhang

Chao Ding

Feng Liu

Kiyoto Sasaki

Qing Shen

Masamori Endo
title: All inorganic cesium lead halide perovskite nanocrystals for solar pumped laser application
year: 2020

abstract: In this paper, we present DBR lasers using DUV lithography in a generic InP based photonic integration platform. The DBR lasers exhibit SMSR over 45 dB and laser linewidths below 100 kHz.
author_names: Mu-Chieh Lo
title: Narrow Linewidth DBR Laser Using Open Access High Precision Grating in InP PIC Generic Foundry Platform
year: 2020

abstract: Abstract Flexible energy harvesters based on piezoelectric nanomaterials have attracted great attention because they enable a self powered system that converts electric energy from ambient energy resources. To achieve perovskite structured piezoelectric nanopowders, most studies have utilized multi step chemical based hydrothermal reaction with repeat purification processes, which results in time consuming production, low yield production, and the inevitable existence of second phase. As an alternative that addresses the drawbacks of previous synthesis methods, the ultrafast laser processing based on cold ablation is highly promising for nanomaterial synthesis. In this work, we investigated the feasibility of synthesizing BaTiO3 nanoparticles by the picosecond laser ablation of a bulk BaTiO3 target in an ethanol solvent. The picosecond laser synthesized BaTiO3 nanoparticles have a spherical shape with a size of ~300 nm and typical perovskite crystallinity with tetragonal phase. To investigate the piezoelectric response from BaTiO3 nanoparticles, we used a piezoresponse force microscope and confirmed the piezoelectric charge constant of ~130 pmV 1. The results indicate the viability of synthesizing piezoelectric ceramic nanoparticles by the laser ablation of a bulk target in a liquid environment.
author_names: Insung S Choi

Su-jin Lee

Jong Chan Kim

Yeong-gyu Kim

Dong Yeol Hyeon

Kung Sun Hong

Jeong Hun Suh

Dongsig Shin

Hu Young Jeong

Kwi-Il Park
title: Piezoelectricity of picosecond laser synthesized perovskite BaTiO3 nanoparticles
year: 2020

abstract: Perovskite solar cells have attracted much attention recently for their high efficiency, ease of preparation and low cost. Here, we report a novel laser annealing method for perovskite films at a low substrate temperature by scanning laser spots on the film surfaces. An ultrafast crystallization process within a few seconds is realized under a laser with a high intensity and a fast scanning speed. Because the crystalline perovskite phase has a stronger light absorption than the amorphous phase, the fast laser annealing can induce a higher temperature in the former and lead to the selective growth of large perovskite grains. Under optimum conditions, perovskite films with high crystallinity are successfully fabricated, resulting in perovskite solar cells with high power conversion efficiency and good stability. Moreover, a faster laser annealing process of perovskite films is achieved by using a linear laser beam, which is expected to be a promising technique for the mass production of large scale perovskite solar cells.
author_names: Peng You

Guijun Li

Guanqi Tang

Jiupeng Cao

Feng Yan
title: Ultrafast laser annealing of perovskite films for efficient perovskite solar cells
year: 2020

abstract: We report on a facile and rapid photo induced process to conjugate graphene based materials with metal halide perovskite nanocrystals. We show that a small number of laser pulses is sufficient to decorate the 2 dimensional (2D) flakes with metal halide nanocrystals without affecting their primary morphology. At the same time, the density of anchored nanocrystals could be finely tuned by the number of irradiation pulses. This facile and rapid room temperature method provides unique opportunities for the design and development of perovskite 2D nanoconjugates, exhibiting synergetic functionality by combining nanocrystals of different morphologies and chemical phases with various 2D materials.
author_names: Athanasia Kostopoulou

Konstantinos Brintakis

Efthymis Serpetzoglou

Emmanuel Stratakis
title: Laser Assisted Fabrication for Metal Halide Perovskite 2D Nanoconjugates: Control on the Nanocrystal Density and Morphology
venue: Nanomaterials
year: 2020