Passively Q-switched intracavity single resonant optical parametric oscillator and Cr4+：YAG laser
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摘要: 分析了以Cr4+:YAG作为饱和吸收体和激光增益介质的被动Q开关Cr4+:YAG激光器腔内抽运的Cr4+:YAG激光器和单共振光学参变振荡器(SRO)的特性.建立了描述这类激光器和单共振光学参变振荡器的动力学特性的速率方程.结果表明,适当条件下作为激光增益介质的Cr4+:YAG同时具有对二阶非线性作用过程产生的处于Cr4+:YAG激光增益谱范围内的SRO信号波的放大作用.分析中考虑了Cr4+:YAG较高激发态和激光上能级之间的弛豫时间约为100ns的中间能级对Cr4+:YAG饱和吸收体和激光器以及ICSRO的影响.
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关键词:
- 非线性光学 /
- 内腔单共振光学参变振荡器 /
- 被动Q开关 /
- 速率方程 /
- 光放大
Abstract: The characteristics of the Cr4+:YAG laser and single resonant optical parametric oscillator(SRO) pumped intracavity by a passively Q-switched Nd3+:YAG laser are analyzed using Cr4+:YAG as the saturable absorber and laser gain medium.The rate equations describing the dynamic characteristics of this kind of laser and intracavity SRO(ICSRO) are set up.Under suitable conditions,the Cr4+:YAG laser gain medium can amplify the SRO signal wave generated in the second-order nonlinear interacting process if the wavelength of this wave is in the range of the gain spectra of Cr4+:YAG.The influence of intermediate level on the Cr4+:YAG saturable absorber and laser as well as ICSRO are considered in the analysis.This intermediate level between the higher excited state and the upper laser level has a relaxing time constant of approximate 100ns. -
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