染料激光器由于不同的抽运方式,在出光效率和最佳输出耦合率等参数上有很大的不同。根据速率方程理论,分析了铜蒸气激光器(CVL)511 nm横向抽运染料罗丹明6G(Rh6G)激光振荡器的光-光转换效率问题。得出染料对激光的自吸收损耗效应是造成横向抽运和纵向抽运两种方式光-光转换效率与输出耦合率差异的主要原因。对不同的染料Rh6G浓度和不同的输出耦合镜反射率进行横向抽运实验,得到8.2%的最高光-光转换效率。实验结果显示横向抽运时较低的Rh6G浓度可以降低染料自吸收效应对出光效率的影响。同时,最佳输出耦合镜的反射率比纵向抽运时小。

According to various pumping styles, the laser output efficiency and optimal output coupling are different, and so do other parameters. Based on theory of rate equation, the optical-to-optical conversion efficiency of 511 nm copper vapor laser (CVL) transversely pumped Rh6G dye laser oscillator is studied. Result shows that the major reason of the difference of optical-to-optical conversion efficiency and output coupling between transverse pumping and longitudinal pumping is dye self-absorption. Experiments of transverse pumping have been done for various Rh6G concentration and output coupling mirror′s reflectivity, and the highest optical-to-optical conversion efficiency 8.2% was obtained. The relation between the efficiency and dye concentration and the reflectivity of output mirror was given. Experimental results show that the lower Rh6G concentration could reduce the influence of dye self-absorption on laser output efficiency, and meanwhile the optimal output coupling mirror′s reflectivity in transverse pumping is bigger than that in longitudinal pumping.