基于线性光学原理的激光防护镜近况

随着激光技术的发展,激光在军事领域的应用越来越广泛。因此,如何防护激光对人眼的损害就显得越来越重要。本文分析了激光对人眼的危害,介绍了几种常用激光器的眼睛安全标准,综述了基于线性光学原理的激光防护镜的防护原理及国内外研制概况,并对三类基于线性光学原理的激光防护镜的优缺点进行了简要的比较。针对目前存在的问题,评述了激光防护镜今后的发展趋势。     

光引发和放电引发的脉冲氧碘化学激光器

光引发和放电引发的脉冲氧碘化学激光器氧碘化学激光器具有波长短、效率高、光束质量好、高储能、装置安全简便等优点。１９７８年美国空军武器实验室ＭｃＤｅｒｍｏｔｔ等人首次实现了连续波氧腆化学激光器出光［１］．由于氧碘化学激光器具有许多潜在的应用，这种新型高...     

半导体可饱和吸收镜作为被动调Q吸收体的发展状况

简介了近年来发展起来的若干种新型固体激光器被动调Q用吸收体：掺Cr4+系列，Cr，Nd∶YAG自调Q激光晶体，人眼安全激光器被动调Q用吸收体，GaAs吸收体，半导体可饱和吸收镜。着重介绍了固体激光器和光纤激光器调Q用半导体可饱和吸收镜的原理、研制方法及应用状况。     

掺杂浓度和初始温度对热容激光器应力分布的影响

建立了闪光灯抽运热容型钕玻璃棒状激光器的模型,计算并分析了棒内的温度和应力分布.结果表明,棒的掺杂浓度和初始温度对热容激光器的应力分布有影响.所得结果对热容激光器的设计、安全运行和运行成本的降低有实际应用意义.     

大气消光特性与机载激光雷达眼睛安全关系的研究

依据美国ANSI标准，定量分析了气溶胶、卷云和沙尘的垂直消光特性对机载激光雷达激光脉冲眼睛安全最大阈值能量的影响；以地基激光雷达探测得到的合肥上空沙尘暴为例，定量给出了大气中各成分消光特性对飞机眼睛安全最低高度的影响；模拟计算了各种大气成分的消光特性对激光脉冲眼睛安全系数的影响随高度的变化规律。计算结果表明：沙尘层对激光脉冲眼睛安全最大阈值能量的影响幅度可达几十毫焦。该结果为我国第一台机载大气探测激光雷达激光脉冲能量设置提供了基本依据。     

CLR-2二极管泵浦单频Tm,Ho:YAG/Tm:YAG激光器

CLR光子公司研制了一种新型固体激光器——连续波二极管泵浦Tm,Ho∶YAG激光器。据说,这种激光器是在市场上销售的首批二极管泵浦单频2.1μm激光器。 CLR-2的特点是超稳定有效激光二极管泵浦;Tm,Ho∶YAG激光器在2.1μm波段工作对人限安全(Tm∶YAG激光器在2.02μm波段工作);从Tm,Ho∶YAG的2088至2100nm     

太阳光直接泵浦固体激光器研究进展

太阳光直接泵浦固体激光器相对于传统二极管泵浦激光器具有能耗低、效率高等优势,在大气传感、深空通信及国防安全等重要领域具有极大的应用潜力,战略意义重大.本文综述了太阳光直接泵浦固体激光器的阳光收集光学系统、增益介质及泵浦系统设计的国内外研究进展,揭示了其与激光输出质量及光转化效率提升的定向关联.提出在太阳光直接泵浦固体激...     

激光照明用驱动电源的设计

设计了一种功率可调式激光器驱动电源,包括驱动电路和温控电路,实现了对激光器的直接强度调制.采用慢启动、断电保护、过流保护等多种技术较好地提高了电源的工作性能.基于温控技术设计了一种实用的温控电路,保证激光器在较宽的温度范围内安全正常工作.通过理论分析,探讨了提高调制带宽的方法.该电源输出电流0～2 A,可以同时驱动多个并联大功率激光器,工作性能稳定可靠,具有广泛的应用价值.     

激光器频率稳定性的分析优化

在相干光通信中,激光器的频率稳定性是相当重要的,压缩光源的频率噪声不仅可以降低通信的误码率,而且能够增大系统的安全传输距离,以此提高通信质量。而且在其它领域低频率噪声光源也应用广泛。将正弦调制信号加载到激光器电流调制端口进行波长调制,以乙炔气体的吸收线作为频率参考将激光器频率锁定在乙炔吸收线上,利用单光子波长调制技术实现对DFB激光器的频率锁定。     

千瓦级双包层光纤激光器冷却方案设计理论和实验研究

尽管双包层光纤激光器的散热性能好于传统的固体激光器的散热性能,光纤激光器中的热沉积仍然是限制提高其输出功率的重要因素.以双端抽运的400 W双包层光纤激光器为实例,定量分析了光纤内的热沉积分布.根据所建立的散热模型,为了确保千瓦级双包层光纤激光器安全稳定的运行,抽运端附近的对流换热系数应大于2.8×10^-2W·cm^-2K^-1.据此设计出高功率双包层光纤激光器抽运端冷却装置并成功应用在激光系统中,获得了千瓦级的激光输出. 关键词： 热沉积 散热 双包层光纤激光器     

Multi-objective optimisation of lidar parameters for forest-fire detection on the basis of a genetic algorithm

A numerical model for the estimation of the laser pulse energy required for forest-fire detection with a predefined signal-to-noise ratio by an eyesafe lidar operating at wavelength of 1.54 μm is developed. This model is coupled with a genetic algorithm, which is used for multi-objective optimisation of the fitness function (weighted sum of laser price, telescope price, and surveillance time) using telescope diameter and laser beam divergence as independent variables.     

激光在汽车工业中的发展现状与应用

介绍了近年来激光技术在汽车工业中的几项重要应用，详述了激光在诸如激光焊接、激光打标、激光热处理和激光切割等有关汽车工业技术中的应用状况，同时对汽车工业中所用激光类型进行了归类。最后综述了半导体激光器泵浦全固态激光器以及短脉冲和超短脉冲激光的应用前景。     

Efficient multi and single line atomic fluorine lasers

Intense multi- and single-line laser operation is reported from semiconductively preionised atomic fluorine lasers employing an optimised capacitor transfer excitation circuitry. The performance and spectral characteristics of these lasers are discussed and compared to the characteristics of previously described atomic fluorine lasers. The efficiency of one of these lasers described, at optimum conditions, is reaching a value as high as 0.14%. To the best of our knowledge, this is the highest efficiency reported up date, for an atomic fluorine laser.     

Resonantly-pumped Er3+:Y2O3 ceramic laser for remote CO2 monitoring

Laser performance of resonantly-pumped Er³⁺-doped Y₂O₃ ceramic laser for remote DIAL CO₂ monitoring is reported. Slope efficiency of 64.6% and output power of over 9.3 W have been achieved with this eyesafe, 1.6-μm, CW laser in a cryogenically cooled operation regime despite the marginal optical quality of currently available laser gain material.     

双频激光技术研究新进展及发展趋势

双频激光器在干涉测量和光学传感等技术领域扮演极其重要的角色。综述了近年来双频激光技术研究的新进展(包括双折射双频He Ne激光器、双折射双频Nd:YAG激光器和双纵模半导体激光器),简要介绍了各种双频激光器的工作原理,分析了这些双频激光器在频差大小、频差稳定性和频差调谐特性等方面的优缺点,指出了今后双频激光技术研究的发展趋势。     

Time history of laser power pulses from molecular gas lasers

The leading edge of laser power pulses is shown to be described by one exponential function in molecular gas lasers with a directly pumped upper laser level and by a sum of two exponential functions in lasers with an indirectly pumped upper laser level.     

CO激光器的发展及潜在应用

本文描述CO激发器的发展及潜在应用。叙述工业用预冷气流激光器,气动激光器和外科用水冷管式激光器。概述三种类型的预电离TEA CO激光器及电子束控制CO激光器。最后介绍CO激光器选用的贵金属催化剂。     

Frequency-tunable semiconductor lasers

Recent advances in frequency-tunable semiconductor lasers are reviewed. They are classified into hybrid and monolithic tunable lasers. Monolithic tunable lasers based on distributed Bragg reflector or distributed feedback laser structures are most attractive for practical applications. The device structures and the tuning characteristics are described, with emphasis on the tuning range, spectral linewidth and frequency-switching time. Recent system experiments using monolithic tunable lasers in an optical communication area are also described.An Invited Paper     

Optically pumped terahertz lasers with high pulse repetition frequency: theory and design

Optically pumped terahertz （THz） lasers with high pulse repetition frequency are designed. Such a laser includes two parts： the optically pumping laser and the THz laser. The structures of the laser are described and analyzed. The rate equations for the pulsed THz laser are given. The kinetic process and laser pulse waveform for this kind of laser are numerically calculated based on the theory of rate equations. The theoretical results give a helpful guide to the research of such lasers.     

Absorptive and dispersive bistability in semiconductor injection lasers

Recent progress in the study of both absorptive and dispersive bistability in semiconductor injection lasers is reported. Inhomogeneously excited semiconductor lasers as an absorptive case, and laser diode optical amplifiers and optical injection locking systems of laser diodes as dispersive cases, are described. Applications of bistable semiconductor lasers, such as optical memories, optical regenerative amplifiers and all-optical switching, are also discussed.