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Improvement of carrier distribution in dual wavelength light-emitting diodes

Journal of Semiconductors 2013年第5期34卷 87-89页

作者：司朝魏同波张宁马骏王军喜李晋闽 Research and Development Center for Semiconductor Lighting Institute of SemiconductorsChinese Academy of Sciences

The effect of different barriers between green and blue light regions in dual wavelength light emitting diodes was studied. Compared with a traditional sample, electroluminescence and photoluminescence spectra of the newly designed samples showed peak intensity improvements and smaller blue-shifts with increasing injection current level, and the bottom quantum-wells light emitting is enhanced. All these phenomena can be ascribed to reduced barrier thickness and indium doping in the quantum-barrier influencing electric fields and more holes injecting into the bottom QWs.

关键词： LED dual wavelength quantum barrier holes injection carrier distribution

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Experiment Study of dual wavelength and dual Pulse Q-switched Intracavity Frequency Doubling of a Tunable Cr∶LiSAF Laser

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Chinese Journal of Lasers 2001年第1期 16-19页

作者： CHEN Changshui 1 WANG Peilin 1 XIE Jianping 2 SHI Dufang 3 SHA Xianwu 3 HE Yulong 3 ( 1 Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China 2 High Research School, University of Science

In this paper, a flashlamp pumped Q switched Cr∶LiSAF laser system with intracavity frequency doubling is designed to obtain dual pulse and dual wavelength laser output. The behaviors of second harmonic output of dual pulse and dual wavelength are studied experimentally. Good results are obtained in experiments: the output energy of each second harmonic pulse a round 448.1 nm is 10.2 mJ, the dual pulse time interval can be tuned widely, and the tunable range of each second harmonic wavelength is 448.1 to 465 nm.

关键词： Cr∶LiSAF laser intracavity frequency doubling dual wavelength dual pulse

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Variable spot size optical system for a dual-wavelength laser therapy device

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Journal of Innovative Optical Health Sciences 2020年第4期3卷 62-68页

作者： Ningning Dong Jinjiang Cui Jiangen Xu Academy for Engineering and Technology Fudan University Shanghai 200433 P.R.China Suzhou Institute of Biomedical Engineering and Technology Chinese Academy of Sciences Suzhou 215163P.R.China

The majority of existing high-power laser therapeutic instruments employ a single wavelength for a single target;thus,they do not meet the requirements for clinical ***,this study designs an optical system for a dual-wavelength high-power laser therapeutic device with a variable spot *** waist of the short arm of the optical cavity and the G1G2 parameter(G-parameter equivalent cavity method)is calculated using MATLAB software,the spot size and divergence angle on the lens are calculated using an ABCD matrix,and the distance between the treatment spot at different spot sizes and the transformation lens is calculated in order to design the treatment *** are conducted to analyze the stability at an output power of 532 nm before beam combination and the power loss after beam *** results show that the output power stability of the 532-nm beam varies by less than 2%over 150 min,and the loss of both wavelengths is less than 20%,which meets the clinical requirements of the *** safety performance can meet the requirements of national general standards for medical electrical *** proposed dual-wavelength laser therapy instrument has both visible wave and near-infrared wave characteristics;thus,it can accurately target both superficial vessels and vessels with a larger diameter and deeper *** therapeutic device has the advantages of simple operation,stable and reliable laser output,high security and strong anti-interference ability,and meets the comprehensive clinical treat-ment demands of vascular diseases.

关键词： Laser therapy dual wavelength beam combination spot transformation

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Experimental Study on dual-wavelength Distributed Feedback Fiber Laser

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Photonic Sensors 2014年第3期4卷 225-229页

作者： Haifeng QI Zhiqiang SONG Jian GUO Chang WANG Jun CHANG Gangding PENG Shandong Key Laboratory of Optical Fiber Sensing Technologies Laser Institute of Shandong Academy of SciencesJinan 250014 China

Four distributed feedback fiber lasers with dual-wavelength operations were studied experimentally in detail. The laser characteristics of these distributed feedback fiber lasers （DFB-FLs） were investigated. The operation conditions for the dual-wavelength output are analyzed and presented. Through this study, the guidance of the design and fabrication of some dual-wavelength distributed feedback fiber lasers are provided.

关键词： Distributed feedback fiber laser dual wavelength phase shift optical fiber sensing

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A review of the dual-wavelength technique for phase imaging and 3D topography

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Light(Advanced Manufacturing) 2022年第2期3卷 136-156页

作者： Haowen Zhou Mallik M.R.Hussain Partha P.Banerjee Department of Electro-Optics and Photonics University of DaytonDaytonOH 45469USA. Department of Electrical Engineering California Institute of TechnologyPasadenaCA91125USA. Halo Industries Inc. Palo AltoCA95303USA

Optically transmissive and reflective objects may have varying surface profiles,which translate to arbitrary phase profiles for light either transmitted through or reflected from the *** high-throughput applications,resolving arbitrary phases and absolute heights is a key *** extend the ability of measuring absolute phase jumps in existing 3D imaging techniques,the dual-wavelength concept,proposed in late 1800s,has been developed in the last few *** adopting an extra wavelength in measurements,a synthetic wavelength,usually larger than each of the single wavelengths,can be simulated to extract large phases or height variations from micron-level to tens of centimeters *** review a brief history of the developments in the dualwavelength technique and present the methodology of this technique for using the phase difference and/or the phase *** applications of the dual-wavelength technique are discussed,including height feature extraction from micron scale to centimeter scale in holography and interferometry,single-shot dual-wavelength digital holography for high-speed imaging,nanometer height resolution with fringe subdivision method,and applications in other novel phase imaging techniques and optical *** noise sources for dualwavelength techniques for phase imaging and 3D topography are discussed,and potential ways to reduce or remove the noise are mentioned.

关键词： Topography 3D imaging Phase unwrapping dual wavelength

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