变反射率镜非稳腔优化研究──超高斯途径

Characterization Of Unstable Resonator Using Variable Reflectivity Mirror

分析了超高斯变反射率镜非稳腔的腔模和输出特性。以最高输出光束亮度为目标就其腔参数进行了优化研究和设计。ｆ在２０ｍｍ．口径钕玻璃激光介质上采用这种腔结构进行了实验研究，获得了数十焦耳近衍射极限的高亮度激光输出。远场合总能量８０％的发散全角为０．１９２ｍｒａｄ，是衍射极限的１．９倍，输出能量是腔内损耗相当的普通非稳腔的９２％。

The characterization of unstable resonator using Super-Gaussian mirror is analysed theoretically. Its cavity parameters have been designed for getting optimum laser brightness and its output characterization has been investigated experimentally at Φ20 mm Nd:glass laser. The output them has near diffraction limited divergence of 0. 192 mrad (full angle) and has output energy as high as 92% of that of the conventional unstable resonator.