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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。
The liquid laser system has outstanding advantages in suppressing thermal distortion and can achieve long-term, stable high-energy laser output. In the liquid laser system, the laser gain distribution of the conventional two-sided pumping presents the characteristics of strong edge and weak middle, which makes it difficult to obtain the laser output of the single transverse mode and limits the beam quality. A liquid laser system with multiple gain stages connected in series is introduced. Its pumping mode is between side pumping and end pumping, and its gain distribution and laser energy transmission efficiency are numerically simulated. The numerical simulation shows that the liquid laser system connected in series with multiple gain stages can generate a Gaussian gain distribution with high laser beam quality. The transmission loss of the liquid laser system connected in series with multiple gain stages is small, and the laser energy conversion efficiency Up to 30%.