We realize efficient operation of the first Stokes (1240.3 nm) and the second Stokes (1485.8 nm) in external cavity diamond Raman lasers (DRLs) through efficient cavity coupling management and study their output performance. Firstly, an output pulse energy of 0.26 mJ at the first Stokes is generated and the slope efficiency is 84.3%, which closely approaches the quantum limit of 85.8%. Secondly, an output pulse energy of 0.26 mJ at the first Stokes and 0.18 mJ at the second are generated simultaneously. The total Raman output pulse energy is 0.44 mJ with a slope efficiency of 73.0%. To our knowledge, this is the highest slope efficiency in dual-wavelength external cavity DRLs. At the maximum pump level, by managing the cavity coupling, the energy ratio of the second Stokes to the first can be changed from 0.69 to 1.92. Highly efficient operation in external cavity DRLs is very important in practical applications, such as remote sensing, scanning lidar and laser range finding.

中文翻译：

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外腔金刚石拉曼激光器中接近量子极限的高效操作

通过有效的腔耦合管理，我们实现了外腔金刚石拉曼激光器（DRL）中第一斯托克斯（1240.3 nm）和第二斯托克斯（1485.8 nm）的高效运行，并研究了它们的输出性能。首先，在第一个斯托克斯处产生了0.26 mJ的输出脉冲能量，斜率效率为84.3％，接近于85.8％的量子极限。其次，在第一斯托克斯处产生的输出脉冲能量为0.26 mJ，在第二斯托克斯处产生的输出脉冲能量为0.18 mJ。拉曼输出脉冲总能量为0.44 mJ，斜率效率为73.0％。据我们所知，这是双波长外腔DRL中最高的斜率效率。在最大泵水平下，通过管理腔体耦合，第二斯托克斯与第一斯托克斯的能量比可以从0.69更改为1.92。