基于雪崩效应的小型激光激励源电路研究

为了获得高功率、窄脉冲探测激光,提出了一种基于雪崩效应的小型半导体激光激励源电路实现方案,分析了激励电路产生高压窄脉冲信号的原理,介绍了其组成单元信号整形电路、直流偏置电路和高压脉冲产生电路的硬件设计。测试表明,该电路能够输出电压约460V、脉宽小于6.0ns、下降沿约2.5ns的脉冲激励信号,印证了原理设计的正确性。该电路具有高性能、小体积、高可靠和易适装的应用特点,能够有效满足某激光引信对激光激励电路的任务要求。     

可编程多用伪随机激光激励源信号源

针对新一代可编程，变频激光武器的产生，模拟战场环境下激光信号工作频率的变化，向激光干扰机提供可编码伪随机编码时统信号，并对其设计进行粗略的介绍。     

微波激励气体激光器激励参数的测量研究

研究了气体激光器的激励参数，相对激发度和增益系数之的关系，给出了测量微波激励气气体激光器激励数的新方法。     

基于差频激光源的微量气体光声光谱检测系统

在周期极化的铌酸锂晶体中混合1．5－1．6μm可调谐半导体激光和1.064μmNd,YAG调Q脉冲激光,得到3．35－3．66μm的连续可调谐窄线宽激光脉冲,平均输出功率达0.2mW,实验装置比OPO相对简单,紧凑,无振荡阈值,根据该差频发生器的输出特性,设计了共振频率可调的光声池和光声光谱检测系统,并首次利用该系统对低浓度的CH4样品气体进行了光声谱测量,实验结果显示了系统在微量气体测量方面的优越性。     

高重复率CO2TEA激光激励源

主要论述了ＣＯ２ＴＥＡ激光激励源在研制过程中采用的新组件、新技术。其显著特点，大大压缩了体积，减轻了重量，降低了无功损耗，而且工作重复频率高，电磁兼容性好，工作稳定可靠。使ＣＯ２ＴＥＡ激光测距机一体化成为现实。     

电子束激励氟化氢激光实验研究

介绍了利用SPG-200脉冲功率源产生电子束激励氟化氢激光的实验研究情况。重点介绍了实验装置的结构及主要性能指标,给出了不同气体混合比例和不同气压条件下激光输出特性的测量结果,并对实验结果进行了分析。在二极管电压约为190kV,二极管电流约为1.9kA,气体混合比例为C2H6∶SF6=0.35∶10,气室气压为30kPa的条件下,获得了稳定的激光输出。谐振腔为平凹腔时,最大输出能量4.55mJ;谐振腔为平行平面腔时,最大输出能量5.22mJ。     

气体激光器的微波激励技术

作为一种优良的气体激光器的激励技术——微波激励技术,已成功地用于多种辉光放电形式的脉冲和连续波气体激光器中,其中包括原子、分子和准分子激光器,并已进入实用化阶段。本文评述这种激励技术的进展。     

一种S波段噪声干扰激励源设计方法

提出了一种S波段噪声干扰激励源的设计方法,介绍了噪声源的功能、组成以及原理,从工程实现的角度对噪声干扰激励源的设计方法进行了阐述,通过以直接数字合成器(DDS)为核心,结合微波变频网络完成S波段噪声干扰激励源的设计。     

激光陀螺射频激励的激励特性研究

本文给出了射频激励激光陀螺的功率输出和Ｈｅ－Ｎｅ气压,气比关系的实验结果,同时给出了一个实用的射频激励源电路,并帝测了它的输出特性。     

Spectroscopic studies of gas discharges used for argon ion lasers

Characteristics of argon discharge which are relevant to the operation of Ar⁺lasers are investigated. These include ion and electron densities and ion temperatures as a function of current density.     

新式反馈控制气体激光稳流电源

我们采用把控制晶体管接在交流电源测桥式整流器直流输出端进行电流负反馈控制的方式,研制成了供输出功率为2瓦的CO_2波导激光器使用的稳流电源.电源的原理电路和电压电流波形分别示于图1和图2.假设升压变压器SB为一理想变压器,漏感L_s为零,初级电感L_1为无穷大;次级负载折算到初级为一纯电阻R;注入晶体管BG基极的电流为一定值i_(bo)下面我们借助于图1(b)和图2定性分析一下晶体管BG的控制作用.由图1(b)可知,负载电流i_R     

用于远程激光测距机的小体积高功率固体激光器

为了满足军用远程激光测距机对小体积高峰值功率固体激光器的应用需求, 采用短腔长、正交偏振电光调Q技术, 设计了小型风冷LD抽运Nd:YAG固体激光器, 并对样机进行了实验验证。结果表明, 激光器重量630g、重频20Hz、输出能量85mJ、脉冲宽度3.9ns、激光峰值功率21.8MW、束散角1.9mrad, 满足了小型化和高峰值功率的要求。该激光器具备较强环境适应性, 目前已实现工程化应用。     

Optical degradation of high- power ionized argon gas lasers

The development, over the past several years, of high-power continuous duty argon ion lasers has encountered limitations in the form of a severe optical degradation problem. An absorbing film builds gradually on the optical components, which terminates the discharge tube. This layer absorbs a small fraction of the laser power, thermally distorts the optical components, and unbalances the optical cavity. In this way, the laser power that can be extracted is limited to some value far below the inherent capabilities of the active medium. Experimental investigations of Brewster's angle window degradation were performed on a large quartz bore laser capable of CW powers in excess of 100 watts. Methods of recognizing and measuring the extent of window damage were established. Contaminants generated by the discharge erosion of the electrodes and the bore structure proved to be the source of the problem. Studies of the transport processes suggested that the motion of charged particles under the influence of the plasma fields is the dominant mechanism by which the contaminants reach the terminal optics. On the basis of the understanding achieved during this study, various techniques to modify or prevent tile degradation were developed and assessed.     

Characteristics of large-area filamentary guns used for the E-beam stabilization of gas lasers

The development of high-energy electric-discharge lasers has created the requirement for high-voltage large-area uniform-current-density electron beams. This paper describes the characteristics for a class of filamentary electron guns of novel electrode configuration that satisfies these requirements. Expressions are derived for the gun potentials, electric fields, and space-charge-limited current densities. A comparison is made between theoretical and experimental results for a low-voltage model gun. The operating characteristics for large-area high-voltage guns are also discussed.     

用于反激式变换器的BJT功率管驱动电路的设计

为反激式变换器BJT功率管设计了一种驱动电路。针对电流镜复制的精确度,设计了运放、MOS管组成的深度负反馈环路和共源共栅结构对电路进行钳位,使电流精确复制到功率管基极;针对BJT管较慢的开关速度,配合数字控制,缩短功率管状态转换所需时间,降低了功率管损耗。在CSMC 18μm 18 V工艺下,利用Hspice软件进行仿真,结果表明,BJT功率管工作在饱和区,开关转换速度增强,满足了反激式变换器对BJT功率管开关速度的要求。     

高功率二极管泵浦固体激光谐振腔的进展和分析

对近年来用于高功率二极管泵浦固体激光器的新型光腔,如棒成象非稳腔,近共心非稳腔,折迭腔以及SBS相位共轭MOPA系统等进行了深入的分析,并对实现高功率输出和高光束质量的相关技术作了讨论.     

高功率二极管泵浦固体激光谐振腔的进展和分析

对近年来用于高功率二极管泵浦固体激光器的新型光腔，如棒成象非稳腔，近共心非稳腔，折迭腔以及ＳＢＳ相位共轭ＭＯＰＡ系统等进行了深入的分析，并对实现高功率输出和高光束质量的相关技术作了讨论。     

A compact DC-to-DC power converter for distributed power processing

The authors present a compact (55-W/in³), efficient (86% power train), 1-MHz switch-mode, DC-to-DC power converter contained in a 2-in by 2-in by 0.25-in, 1-in³ package. They describe the interleaved forward topology, steady-state analysis, switch transitions, capacitor substrate, planar printed-wiring-board transformer, packaging, electrical performance, power loss analysis, thermal analysis, reliability, and efficiency and power density improvements     

高功率激光器用的折迭式共振腔

利用光束传输矩阵方法,计算了折迭式激光器共振腔内光束半径分布和模体积与转折反射镜曲率半径、气体负透镜参数α的关系.结果表明,由于气体负透镜效应,放电长度较长的气体激光器,采用折迭式腔结构,不仅缩短了空间长度,而且对保证共振腔工作在低损耗区域,从而获得稳定高功率输出是具有重要意义的.