Intracavity frequency doubling of μs alexandrite laser pulses
Intracavity frequency doubling of μs alexandrite laser pulses
复制标题
μs 翠绿宝石激光脉冲的腔内倍频
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
K. Schoof
中科院分区：
文献类型：
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作者：
R. Brinkmann;K. Schoof
利用闪光灯泵浦的调Q紫翠宝石激光器，研究了三镜折叠腔结构的腔内倍频。因此，我们使用不同的非线性光学晶体将基本的750 nm辐射转换为近紫外光谱范围（375 nm）。激光脉冲被拉伸到微秒（s）的时间域由一个电子反馈系统调节谐振腔的损失。我们研究了不同脉冲长度的转换效率以及由于所使用的光学晶体引入的腔内损耗的非线性而导致的脉冲延长的效果。利用BBO晶体，我们能够在375 nm处实现每脉冲25 mJ的二次谐波输出，时间矩形脉冲长度为1微秒（s），并且具有稳定的近似高斯形状的光束轮廓。
Intracavity second harmonic generation with a three mirror folded cavity configuration was investigated with a flashlamp pumped, Q-switched Alexandrite laser. We therefore used different nonlinear optical crystals to convert the fundamental 750 nm radiation into the near UV spectral range (375 nm). The laser pulses were stretched into the microsecond(s) time domain by an electronic feedback system regulating the losses of the resonator. We investigated the conversion efficiency for different pulse lengths as well as the effect of pulse-lengthening due to the nonlinearity of the intracavity losses introduced by the optical crystal used. Working with BBO-crystals, we were able to achieve a second harmonic output of 25 mJ per pulse at 375 nm with a temporal rectangular pulse of 1 microsecond(s) in length and a stable nearly Gaussian shaped beam profile.