Opt Express. 2023 Feb 13;31(4):6907-6916. doi: 10.1364/OE.481209.
We demonstrated a TEM mode orthogonal dual-slab Yb:KG(WO)(Yb:KGW) laser oscillator with high average power. Polarization anisotropy of thermal lenses was investigated and alleviating the astigmatism based on orthogonal dual-slab. In addition, the laser polarization was directly controlled by adjusting the net gain of the two crystals. The maximum output power was highly enhanced compared with single crystal due to effective thermal distribution. For an absorbed pump power of 52.4 W, this oscillator delivered an average power of 26.5 W, corresponding to an optical-to-optical conversion efficiency of 50.6%. Meanwhile, the ellipticity of the output laser was optimized to 0.940. Nearly diffraction-limited beam quality was measured to be 2= 1.19 and 2=1.18.
我们展示了一种具有高平均功率的 TEM 模式正交双平板 Yb:KG(WO)(Yb:KGW)激光振荡器。研究了热透镜的偏振各向异性，并基于正交双平板来减轻像散。此外，通过调整两个晶体的净增益，可以直接控制激光的偏振。与单晶相比，由于有效散热，激光的最大输出功率得到了极大的提高。对于吸收的泵浦功率为 52.4 W，该振荡器输出功率为 26.5 W，对应于 50.6%的光光转换效率。同时，输出激光的椭圆度被优化至 0.940。测量到近衍射极限的光束质量为 2=1.19 和 2=1.18。
