液体激光系统在抑制热畸变方面具有突出优势, 能实现长时间稳定的高能激光输出。在液体激光系统中, 常规双侧抽运的激光增益分布呈现边缘很强、中间较弱的特点, 难以获得单横模激光输出, 限制了光束质量。介绍了一种多增益段串接的液体激光系统, 其抽运方式介于侧面抽运和端面抽运之间, 然后对其增益分布和激光能量传输效率进行了数值模拟。数值模拟表明多增益段串接的液体激光系统能产生近似于高斯型增益分布, 激光光束质量很高; 同时该多增益段串接的液体激光系统的腔内传输损耗较小, 激光能量转换效率可达30%以上。

Liquid laser system has prominent predominance in restraining heat distortion and can achieve stable high-power laser output in long time. In liquid laser system, the gain distribution by ordinary two-sides-pumping has the characteristic of strong gain at the edge but weak at the center and it is very difficult to achieve single transverse mode output. A kind of multi-segments liquid laser system connected in series, with pumping mode between side-pumping and end-pumping is introduced, and the gain distribution and the transmission loss in the resonator are simulated. The simulated results show that the multi-segments liquid laser system connected in series can achieve approximate Gaussian gain distribution, the laser beam quality is very excellent, the transmission loss is little and the laser energy transmission efficiency is higher than 30%.