双色膜V形有源镜结构的固体热容激光器输出特性

Output performance of solid state heat capacity laser with active-mirror and dichromatic coatings

为了避免片状布儒斯特角结构热容激光器由热退偏造成的腔内高动态损耗,采用双色膜技术研制了V形有源镜结构固体热容激光器。该激光器采用曲率半径为5 m的平凹稳定腔结构,共8片Nd:YAG介质,每片介质表面采用双色膜层设计,每2片构成一个模块,由3支氙灯提供能量,激光器由4个模块构成。在双色膜层上,泵浦光透过率大于95%,对1064 nm光波反射率大于99.7%。在1 ms脉宽重复频率运转条件下,激光输出随时间下降并渐趋平稳;在5 ms脉宽运转时,单脉冲输出47 J,输出峰值功率达9.4 kW,与计算得到的10.11 kW的峰值输出基本相符。该振荡器的总体电光效率达到了1.2%,通过进一步优化后,具备向更高功率定标放大的潜力。

In order to avoid the dynamic thermal-induced depolarization losses which relates to Brewster-angle scheme solidstate heat capacity laser, a laser with a V-shaped active-mirror configuration is developed and tested, using high-quality dichromatic coatings. The transmissivity of pump light is greater than 95% and the reflectivity of laser is greater than 99.7% on the same coating. The output fell down limitedly by time in the condition of repetitive operation with 1 ms pulse, and a pulsed energy output of 47 J was generated with 5 ms pulse width and 9.4 kW peak power. The measured results agree with the calculated ones （10.11 kW） in the same condition as the experiment.