High-pressure pulsed molecular lasers

A review of recent developments in high-pressure pulsed molecular lasers is presented. Included are some experimental results on TEA lasers, E-beam lasers, and lasers using Blumlein excitation. Discussions of the kinetic modeling, the parametric behavior, and the characteristics of uniform discharges in the high-pressure pulsed CO2laser are given. Recent results on pulse-initiated chemical lasers, extremely high-pressure lasers, and high-repetition-rate TEA lasers are also discussed. Efforts to control and use the output from these devices are described, and an extensive list of references is given.     

Coherent combining of two pulsed fibre lasers in phase modulated mutually coupled fibre laser array

A scalable architecture for coherent combining of pulsed fibre lasers is reported. Stable synchronous and phase-locked pulsed fibre laser beams are generated in a phase modulated mutually coupled fibre laser array. The mechanism for generating a pulsed laser is different from previous Q-switching, modelocking or pump modulation methods. Two pulsed fibre lasers are coherently combined with 0.48 J pulse energy at the repetition rate of 115 kHz. The repetition rate can be controlled by adjusting the pump current. The combining efficiency of the two pulsed fibre lasers reaches 90 and the fringe contrast is larger than 40 .     

9A9--Pulsed laser holograms

The limited coherence of most pulsed lasers is the principle difficulty in making pulsed holograms. This paper describes techniques used for the production of quality holograms of back lighted subjects, using ordinary pulsed lasers. The arrangements used achieve a temporal and spatial matching of the scene and reference beams to the degree required by the laser coherence cell. Techniques are described which prevent the destruction of the spatial match when using a diffusing screen. The use of lenses to permit the recording of large subjects on small holograms with limited pulsed energy is described. The limitations on subject motion are described. Experimental examples of the techniques are illustrated by holographic recordings of bullets in flight. The technique of double exposure holographic interferometry is also illustrated.     

基于光纤二维材料集成器件的脉冲激光器及外场调控(特邀)

脉冲光纤激光器在加工、光通信、生物医学、非线性研究等领域有很大的应用前景,所以得到了广泛的关注。为了得到脉冲激光输出需要使用饱和吸收体,其中二维材料具有独特的光电特性,在光学和光电器件中已经有很多的应用,尤其是二维材料具备良好的饱和吸收,制备工艺简单,易与光纤系统集成,工作波长宽等特点,被广泛地应用于脉冲光纤激光器。文中回顾了二维材料和光纤的集成方式以及相应的脉冲光纤激光器的输出特性,并且对这类脉冲光纤激光器进行了外场调控的研究。     

脉冲泵浦调Q光纤激光器的优化设计

从光纤激光器的速率方程出发,通过MATLAB编程对光纤激光器的瞬态特性及脉冲泵浦调Q光纤激光器的输出特性进行了数值模拟和优化设计.结果表明,通过脉冲泵浦使输出脉冲宽度被压窄,随着泵浦脉冲宽度和功率的增加,产生稳定激光的时间延长,而且伴随有次脉冲产生.     

脉冲氧碘化学激光模型

采用闪光灯光解RI得到碘原子,再与电子激发态氧O_2(~⊿)传能产生脉冲碘激光的模型。此模型包括35个化学动力学过程。采用Runge-Kutta-Gill积分法求解,得到的结果表明脉冲氧碘化学激光器具有高的效率,提高激光器性能的关键在提高O_2(~1⊿)的分压。     

纳秒量级脉冲光纤激光器研究进展

脉冲光纤激光器作为当前国内外激光领域研究的热点之一,其应用越来越广泛。介绍了获取纳秒量级脉冲激光输出的两种典型结构,并基于相应原理分析了各自的关键性技术。概括了国内外该方向的研究进展,提出了有待于解决的若干问题,最后对脉冲光纤激光器的应用和发展前景进行展望。     

高功率光纤激光器研究进展

高功率掺镱双包层光纤激光器由于在效率、散热和光束质量方面的优势,在工业加工、医疗和国防等领域具有广泛的应用前景,是目前国际上激光技术研究的热点之一.首先综述了国际上高功率光纤激光器的研究进展情况,然后重点介绍了中国科学院上海光学精密机械研究所在连续光纤激光和脉冲光纤激光方面所取得的进展,采用双端泵浦技术,在15 m的国产双包层光纤中获得440 W的连续输出,采用MOPA方式,以4 m长的国产光纤作为放大介质,在100 kHz时,获得了133 W的平均功率输出.     

GSMBE生长1.8-2.0μm波段InGaAs/InGaAsP应变量子阱激光器

报道了气态分子束外延(GSMBE)生长1.8—2.0μm波段InGaAs/InGaAsP应变量子阱激光器的研究结果．1.8μm波段采用平面电极条形结构,已制备成功10μm和80μm条宽器件,器件腔长500μm,室温下光致发光中心波长约为1.82μm,在77K温度下以脉冲方式激射,阈值电流分别约为250mA和600 mA,中心波长分别在1.69μm和1.73μm附近． 2.0μm波段,制备成功8μm宽脊波导结构器件,器件腔长500μm,室温光致发光中心波长约为1.98μm,77K温度下以脉冲方式激射,阈值电流约为 20mA,中心波长约为1.89μm,其电流限制和纵模限制效果优于平面电极条形结构器件．     

高峰值功率重频脉冲固体激光器

综述了高峰值功率重频脉冲固体激光器的发展现状,对其中的Q开关、腔倒空、锁模等窄脉冲技术和放大技术进行了分析,展示了高峰值功率重频脉冲固体激光器的发展前景。     

高峰值功率重频脉冲固体激光器

综述了高峰值功率重频脉冲固体激光器的发展现状，对其中的Ｑ开关、腔倒空、锁模等窄脉冲技术和放大技术进行了分析，展示了高峰值功率重频脉冲固体激光器的发展前景。     

InGaAs／InGaAsP分别限制应变量子阱激光器的研制及其特性研究

报道了利用ＬＰ－ＭＯＶＰＥ技术生长高质量的ＩｎＧａＡｓ／ＩｎＧａＡｓＰ分别限制应变量子阱激光器结构材料、激光器制作和结果．宽而激光器实现了室温脉冲受激发射．激射波长为１．４９μｍ，在腔长为２０００μｍ时，最低阈值电流密度为０．３０ｋＡｃｍ－２．最大脉冲光输出峰值功率达５００ｍＷ以上．同时，从理论和实验上研究了阙值电流及阙值电流密度随激光器腔长的变化关系，并与ＬＰ－ＭＯＶＰＥ生长制作的宽面双异质结构激光器进行了比较．     

Index guiding dependent effects in implant and oxide confined vertical-cavity lasers

Implant and oxide confined vertical-cavity surface-emitting lasers are compared in terms of properties dependent upon the nature of index guiding in the two structures including CW threshold current scaling with size, light-current linearity, pulsed operation delay, and beam profiles. The oxide confined lasers, fabricated by wet thermal oxidation, have a built-in index guide and thus exhibit substantially better properties than do lasers from the same wafer fabricated by proton implantation which rely on a thermal lens to reduce diffraction losses.     

Broadband Pulsed Fiber Laser Generation with Topological Insulator: Towards the Mid-Infrared Regime

In recent years, topological insulators have aroused the attention of a great number of scientists due to their unique electronic structures and peculiar physical properties. Triggered by the similar electronic structures as graphene, the broadband nonlinear absorption properties of topological insulators were investigated. Moreover, the mode-locked or Q-switched fiber lasers based on topological insulators were realized for broadband operating wavelength. Here, we present an overview of the preparation, transferring, linear and nonlinear optical properties, and their applications of topological insulators in pulsed fiber lasers. The pulsed fiber lasers towards midinfrared regimes have been proposed.     

室温脉冲螺旋Wiggler磁体和大电流脉冲电源的研究

本文研究了适用于自由电子激光的室温脉冲螺旋Ｗｉｇｇｌｅｒ磁体，对其设计构思、磁场特性和设计参数进行了分析和计算．作者在文中还研究并设计了螺旋Ｗｉｇｇｌｅｒ磁体的大电流宽脉冲供电电源；分析了脉冲电流的时间特性对产生自由电子激光的影响程度．     

超短脉冲光纤激光相干合成(特邀)

相干合成技术能够突破单路激光的功率和脉宽极限,实现超高功率、超短脉宽的脉冲激光输出。介绍了超短脉冲光纤激光空域、时域和频域相干合成的基本原理和关键技术。综述了空域、时域和频域相干合成系统及其关键技术的研究现状,梳理了超短脉冲光纤激光相干合成的发展趋势,为相关技术的发展提供参考。     

氖的光电压效应

本文报道氖放电气体在分别受到连续和脉冲激光微扰时产生光电压效应的实验结果,并讨论了光电压效应的产生机制。     

大功率半导体激光器热弛豫时间的测量

根据脉冲工作状态下半导体激光器激射光谱随结温升高而发生红移的原理,提出了一种测试半导体激光器热弛豫时间的新方法——利用调节取样积分器(Boxcar)取样门,测量光信号脉冲内不同时刻的时间分辨光谱。采用此方法对TO封装和厘米-靶条(cm-Bar)阵列的AlGaAs/GaAs半导体激光器的动态热特性进行了测试,得到其热弛豫时间分别为66μs和96μs。     

基于量子级联激光器的气体检测研究

随着社会的发展,对基于激光光谱技术的快速、灵敏和选择性气体探测的需求日益增加,量子级联(QC)激光器特有的高输出功率、宽调谐范围和能够在室温或者接近室温下工作的特性使它成为气体遥测的理想光源.详细描述了QC激光器,介绍了基于室温脉冲QC-DFB激光器的典型的中红外激光光谱实验装置,并探讨了QC激光器应用于气体检测的广阔前景.     

ZnS薄膜脉冲激光沉积及其发光特性

综述了ZnS的发光机制,脉冲激光沉积(PLD)制备薄膜的原理、特点,分析了在用PLD制备ZnS过程中各主要沉积条件对成膜质量的影响,展望了ZnS薄膜的应用前景。