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Research on Excitation and Relaxation Processes in the Self-Terminating Metal Vapor Laser of Low-Temperature Operation Using a Metal-Vapor-Complex Reaction

利用金属蒸气络合物反应低温工作自终止金属蒸气激光器的激发和弛豫过程研究

基本信息

批准号：
63550281
负责人：
TANIGUCHI Hiroshi
金额：
$ 1.22万
依托单位：
Iwate University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

项目摘要

The phenomenon of relaxation oscillations has been observed in a variety of lasers, although not so frequently in gas lasers. Relaxation oscillations are not generally observed because the decay rate of the upper laser level is large Nh most gas lasers compared to that in solid-state lasers, semiconductor lasers, and certain other laser systems in which the recovery time of the excited population inversion is substantially longer than the laser cavity decay time. However, in certain circumstances the condition for the relaxation oscillation can be satisfied even in gas lasers because in the metal-vapor laser, the decay rate of the upper laser level varies over a wide range through the resonance-radiation trapping effect owing to the resonance transition between the ground and the upper laser level.We observed an oscillatory/nonoscillatory waveform in the 510.6nm laser output of a discharge-pumped CuCl vapor laser. An undulation with a time separation of the resonator transit time is frequently observed in the copper vapor laser (CVL) output. However, the undulation observed in our experimentsis not due to this effect. Either oscillatory or nonoscillatory behavior appeared, depending on the operating temperature of the laser.These behaviors were analyzed based on the rate equations of the idealized 3-level system of the CVL by the following theoretical methods ; where the rate equations for the self-terminating metal vapor laser (ST-MVL) were newly introduced to discuss the transient features.1. analytical solutions by the small-signal approxination, 2. exact solutions by the numerical integration (by the large-signal theory), 3. analytical and numerical solutions of large-signal approximation (the combined method of the small-signal approximation and the large-signal theory).These results of the analysis of 1-3 well explained the waveform variation of the CuCl vapor laser output in the experiments.

弛豫振荡现象已经在各种激光器中观察到，尽管在气体激光器中不是那么频繁。一般不会观察到弛豫振荡，因为上激光能级的衰减率很大，与固体激光器、半导体激光器和某些其他激光系统相比，大多数气体激光器的激发态粒子数反转的恢复时间比激光腔衰减时间要长得多。然而，在某些情况下，即使在气体激光器中也可以满足弛豫振荡的条件，因为在金属蒸气激光器中，由于地面和上层激光能级之间的共振跃迁，通过共振辐射俘获效应，上激光能级的衰减率在很大范围内变化。我们在放电泵浦的CuCl510.6 nm激光输出中观察到了振荡/非振荡波形。在铜蒸气激光器(CVL)输出中，经常观察到谐振腔渡越时间间隔的起伏。然而，我们在实验中观察到的波动并不是由于这种效应。根据激光器工作温度的不同，可以出现振荡或非振荡行为。本文从理想的CVL三能级系统的速率方程出发，采用以下理论方法对这些行为进行了分析；其中，新引入了自端接金属蒸气激光器(ST-MVL)的速率方程来讨论其暂态特性。小信号近似的解析解，2.数值积分的精确解(大信号理论)，3.大信号近似的解析解和数值解(小信号近似和大信号理论相结合的方法)。这些分析结果很好地解释了实验中CuCL蒸气激光器输出的波形变化。