高功率TEA CO_2激光器非稳腔实验研究

为了提高光束质量、压缩光束发散角,利用现有高功率稳定腔TEA CO2激光器进行了非稳谐振腔的技术改造及激光输出试验,非稳谐振腔采用正分支虚共焦型非稳腔方案。为充分研究谐振腔结构参数及激光振荡模体积对输出能量和光束发散角的影响,共设计加工了包含4种放大率、5种模体积的20组非稳腔腔镜组合。在其它参数都相同的试验条件下,进行了非稳腔镜的单脉冲输出对比试验,得到的最大输出能量为14 J,是原平凹稳定腔的70%,而光束发散角只是原平凹稳定腔的1/4。

Experimental study of unstable resonator for high-power TEA CO2 laser

The experiments of unstable resonator were performed for compressing divergence angle through modifying a high-power stable resonator TEA CO2 laser. The virtual confocal positive branch was adopted to study the influences of structure parameters and mode volume on output energy and optical beam divergence for the unstable resonator. Twenty sets of mirrors with four magnifications and five mode volumes were designed and manufactured. In the same experimental conditions, the maximum pulsed energy of the unstable resonator is 14 J, which is 70% of that of the plano-concave stable resonator, but the divergence angle is just a quarter of the latter’s.