距离选通式半导体激光夜视系统

距离选通式半导体激光夜视系统是采用高功率脉冲半导体激光器作为夜视系统的照明光源、以微光管作为接收传感器的主动成像夜视系统。介绍了半导体激光夜视系统中所采用的高质量脉冲半导体激光光源技术及距离选通技术。其中光束准直整形技术和改善光场均匀性技术是脉冲半导体激光夜视系统的关键技术。距离选通式激光夜视系统消除了脉冲激光带来的后向散射及杂散光的干扰,提高了接收信噪比,可获取清晰的夜视图像。实验证明采用距离选通式半导体激光夜视系统可在很差的气象条件下工作,并可获得清晰图像,作用距离达5 km。该系统不仅用于军事领域也可用于边防、公安、搜救、监控等其他领域。     

高速硅闸流管的原理与制造方法

本文介绍高速硅闸流管简要原理制造方法。该器件可用于激光通信、引爆（信）、测距、小型雷达、模拟射击、游戏枪、车辆防碰撞等方面，也可用于各种脉冲电源及脉冲开关上。     

数字激光告警系统探测接收前端设计

探测接收前端是激光告警系统的关键部件,针对数字激光告警系统设计激光脉冲探测接收前端.采用宽带、高增益、低噪声的跨导放大方式实现了对最小来袭激光脉冲产生的10 nA,10 ms的微弱窄脉冲电流的放大,采用放大器饱和方式实现信号的整形,把来袭激光脉冲转换、放大成数字系统能处理的数字脉冲,脉冲宽度代表作用能量大小.前端最小可检测来袭激光信号能量达1μW,动态范围达100 dB.该宽带低噪声跨导放大电路很好地处理了电容对窄脉冲的影响,具有带宽宽(500 MHz),成本低的特点,为放大微弱的ns级及以下的窄脉冲电流信号提供一个很好的宽带方案.该设计结构简单、成本低廉、易于维护,不仅可用于激光来袭探测,还可用于激光安防系统等.     

随机脉冲串可分辨距离的多普勒激光雷达

随机脉冲串可分辨距离的多普勒激光雷达一种可分辨距离的多普勒激光系统包括激光本机振荡器、光学随机脉冲信号发生器、外差式输出脉冲监视器、外差式接收机、可选择的延迟线、混频器、多普勒分析仪、显示器与多普勒分析仪及显示图相耦合的处理机，该处理机用于处理接收的...     

高精度整形激光脉冲产生技术研究

研究了一种用于惯性约束聚变激光驱动器的纳秒级、高精度整形激光脉冲产生技术。采用中心波长为980nm的激光二极管作为参考光,以自动调控幅度调制器的偏置工作点,实现了脉冲工作体制的幅度调制。基于高速电光调制技术,采用两级幅度调制器设计了主振荡功率放大型全光纤激光脉冲产生装置。其中,第1级幅度调制器用于对输入连续运转的单纵模激光进行初始精密脉冲整形,第2级幅度调制器用于对激光脉冲进行二次精密整形和时域噪声抑制。实验研究表明,该激光脉冲产生装置可输出脉冲宽度在"0.1~50.0ns"范围内连续可调、对比度大于2000…1的高精度任意整形激光脉冲,满足了激光脉冲产生装置较强脉冲控制能力的要求。     

脉冲激光的非相干合成技术研究

为了实现高功率、高光束质量的激光输出,采用脉冲激光同步延时控制技术,将多束脉冲激光按时序合成一束脉冲激光,可用于产生大功率激光源。利用所设计的激光脉冲同步延时控制器,控制各个激光脉冲的时序,使按时序输出的多路激光脉冲依次通过光束合成装置,在空间合成为一束。在实验中将3束脉冲激光束合成,合成效率达到95.8%。结果表明,合束后的脉冲激光功率基本等于各束光相加的总和,同时保持了较好的光束质量。     

转镜式快速扫描自相关器的研究

本文描述一种用于飞秒激光脉冲宽度测量的自相关装置。它可令光脉冲产生周期性的时间延迟。借助于示波器,可以显示出激光脉冲强度的二次相关曲线,从而实现对周期性飞秒脉冲宽度的实时快速监测。     

宽带激光参量放大器及其在飞秒拍瓦（10^15W）脉冲激光技术中的应用

飞秒超高功率,超高强度激光系统将为极端条件下的激光和物理相互作用提供实验研究手段,支持飞秒激光脉冲放大的宽带激光放大器是研制这类强激光系统的关键单元。本文讨论了参量光放大器的宽带特性,它可用于飞秒啁啾脉冲激光放大。据此,建立利用此方案结合纳秒钕玻璃高能激光装置产生飞秒超强激光脉冲、和传统的钕玻璃啁啾脉冲激光放大相比,ＯＰＣＰＡ可大幅度提高输出功率和光束质量。     

TOC系列准分子激光器

准分子激光器是以输出紫外激光为主的一种气体脉冲激光器．它具有脉冲能量大,重复频率高,功率稳定,工作寿命长,可靠性好及使用方便等特点．适用范围：在配以相关装置和选用合适的输出激光波长条件下,在科学研究上可用于激光大气探测、激光化学;医学上可用于冠状动脉硬化的消融、人眼角膜屈光度矫正;在工业技术领域,可用干集成块芯片退火、镀超导膜、刻制光纤光栅、计算机硬盘磁头导线绝缘层剥离、产品上打标记;农业技术上可用于种子遗传因子的辐照诱变。技术参数;分别可输出波长：193Ilnl、248111、308111;激光单脉冲能量范围：…     

CO2和CO激光激活介质用作相位共轭反射镜的非线性元件

ＣＯ_２和ＣＯ激光激活介质用作相位共轭反射镜的非线性元件引言产生“长”脉冲（１０～１０３μｓ）辐射的脉冲和脉冲一周期ＣＯ２激光器及ｃｏ激光器可用于各种目的（例如材料加工、光泵等）。为了改善此类激光辐射角的方向性，可在非线性介质中产生四波相互作用应用辐...     

高频电光调Q板条激光器的第一脉冲控制

Q开关激光器在高重复频率运行时,存在"第一脉冲现象",这不仅在激光的很多工业应用中颇为不利,也会造成不必要的能量损失,基于激光速率方程,以电光Q开关部分端面泵浦的板条激光器为例,建立了理论模型对电光Q开关激光器的脉冲输出及粒子数积累过程进行模拟.分析了"第一脉冲问题"的产生机理,并提供了一种通过调制普克尔斯盒上电压脉冲的方法对第一脉冲能量加以控制的方案,并给出了通过这一方法控制第一脉冲问题的理论和实验结果.     

Modeling pulse shape of Q-switched lasers

A general approach describing the pulse shape and temporal width of Q-switched lasers has been derived. Based on a normalized intermediate variable describing the ratio of population inversion density at the beginning of Q-switch to that at threshold, a generalized characteristic equation that governs passively and actively Q-switched lasers is derived. From the characteristic equation, the pulse symmetry property and pulse width can be described and easily calculated for any given operating parameters, and the waveform of the laser pulse can be reconstructed without solving the laser rate equations. An approach is also given for the case of intracavity frequency-doubled Q-switched lasers. Theoretical results show agreement with experiments for a diode pumped Nd:YAG laser system that is passively Q-switched by a Cr⁴⁺ :YAG absorber     

Fir laser emissions from population inversion transition by TEA-CO2 laser pumping

In this paper, the numerical analysis is given which is applicable for a TEA-CO₂ laser pumping in search of effective pumping method. The analysis also can estimate the optimum pressure for a given molecule and a given pulse laser. Also we report in this work many FIR laser emissions from population inversion transition which have never observed before using a TEA-CO₂ laser.     

铜蒸气激光器脉冲加宽技术及加宽脉冲对放大器效率的影响

本文给出一套实用的铜蒸气激光器(CVL)激光脉冲展宽系统,展宽效率为60％。展宽的光脉冲注入放大器后,放大器效率提高10～12％,同时给出不同延时下,CVL放大光输出脉冲波形,并分析了其变化规律。     

A conceptual design of a hydrogen-fluoride chemical laser driver for inertial confinement fusion

This paper summarizes the results of a study which assessed the potential of the hydrogen-fluoride (HF) chemical laser as a laser-fusion driver. The evaluation was made by designing a laser system in sufficient detail that potential problems could be identified. A summary of the laser design including amplifier parameters, electron-beam accelerator specifications, gas-handling system, pulse shape considerations, and net efficiency calculations is presented here. The final laser design consists of 20, 100 kJ final amplifiers, which combine to yield a 2 MJ laser output. The energy is delivered in a shaped pulse in which one-half of the energy is delivered in the last 3 ns. The pulse rate is 4 pulses per second and the net efficiency is approximately 3 percent. Consideration is also given to the consequences of varying certain laser parameters. The general conclusion obtained from this study is that the HF laser is an attractive laser candidate for laser-fusion applications.     

FM and AM mode locking of the homogeneous laser--Part I: Theory

A new general analysis for mode-locked operation of a homogeneously broadened laser with either internal phase (FM) or amplitude (AM) modulation is presented in this paper. In this analysis, a complex Gaussian pulse is followed through one pass around the laser cavity. Approximations are made to the line shape and modulation characteristics to keep the pulse Gaussian. After one round trip, a self-consistent solution is required. This yields simple analytic expressions for the pulse length, frequency chirp, and bandwidth of the mode-locked pulses. The analysis is further extended to include effects of detuning of the modulator, in which case analytical expressions are obtained for the phase shift of the pulse within the modulation cycle, the shift of the pulse spectrum off line center, the change in pulse length, and the change in power output. Numerical results for a typical Nd:YAG laser are given. In the case of the FM mode-locked laser it is found that there is a frequency chirp on the pulse and that this causes pulse compression and stretching when the modulator is detuned. Etalon effects and dispersion effects are also considered.     

脉冲激光测距机最大测程测试方法研究

最大测程是反映脉冲激光测距机性能优劣的主要参数之一。分析了现行激光测距机最大测程指标考核的方法,比较了各种考核方法的利弊。在此基础上提出了一种采用室外消光法与室内时序增益系数比检测相结合的方案进行激光测距机最大测程测试的新方法．并对两具测距机分别进行了室外消光比、室内时序增益系数比、最大测程的测试,对两者的结果进行了对比。最后针对本测试系统的组成进行了误差分析。结果证明,新的检测方法可以客观、真实、准确地测量1．06μm和1．54μm两种波段的脉冲激光测距机的最大测程,测试结果受天气条件和目标特性影响小,也不受脉冲激光测距机增益电路的影响,且测量精度高,重复性好,操作方便可靠。同时还可对激光测距机测程范围、测距精度、选通范围及选通精度、距离分辨率等主要性能参数进行模拟测试。     

长脉冲紫外预电离TE CO2激光器

研制了一台增益体积为1.17 L的长脉冲紫外预电离TE CO2激光器。基于Pulser/sustainer技术,设计了独立可控的双高压开关抽运电路。在激光混合气体比CO2∶N2∶He=1∶2.5∶13,总气压30 kPa时,以6 nF的Pulser电容控制100 nF的Sustainer电容,获得稳定的辉光放电,激光比注入能量达1.607 J/(kPa.L),其中,Pulser能量不到全部注入能量的5%。另外,在保持Sustainer总电容100 nF不变的情况下,设计了两种脉冲宽度略有不同的Sustainer电路,均获得了稳定的辉光放电,实验测量了放电电压、放电电流与输出激光脉冲波形,并分析了Sustainer放电的阻抗特点。激光器采用“Z”形折叠腔结构,输出激光脉冲宽度达20μs,电光转换效率超过12.0%,最大脉冲能量为6.5 J。     

Compact Nd:YVO/sub 4/ lasers with pulse repetition rates up to 160 GHz

We present a comprehensive study on multigigahertz repetition rate Nd:YVO/sub 4/ lasers, passively mode-locked with semiconductor saturable absorber mirrors. A brief review of Q-switching instabilities with special emphasis on high repetition rate is given. We then present basic design guidelines, and experimentally show that one can push the pulse repetition rate of a Nd: YVO/sub 4/ laser up to 157 GHz, reaching the fundamental limit to the repetition rate which is given by the pulse duration and thus by the amplification bandwidth. We also demonstrate an air-cooled diode-pumped 10-GHz Nd: YVO/sub 4/ laser with 2.1-W average output power and 13% electrical-to-optical efficiency, showing the potential of solid-state lasers generating multiwatt, multigigahertz pulse trains with high efficiency.     

光纤中自相似脉冲研究进展

概述了光纤中自相似脉冲的最新理论与实验研究结果。对稀土元素掺杂光纤放大器、拉曼光纤放大器、光纤激光器、色散渐减光纤中自相似渐进形脉冲的演化特性作了深入细致的描述。并在此基础上对自相似脉冲在光纤通信中的应用作了介绍。展望了自相似脉冲在光纤中的应用前景,并指出了目前研究中有待解决的问题。