Efficient high-power orthogonal dual-slab Yb:KGd(WO4)2 laser oscillator with TEM00 mode

我们演示了具有高平均功率的TEM00模式正交双板Yb：KG（WO4）2（Yb：KGW）激光振荡器。研究了热透镜的偏振各向异性，并基于正交双板缓解了像散。此外，通过调节两个晶体的净增益直接控制激光偏振。由于有效的热分布，与单晶相比，最大输出功率大大提高。对于 52.4 W 的吸收泵浦功率，该振荡器提供的平均功率为 26.5 W，对应于 50.6% 的光转换效率。同时，将输出激光器的椭圆度优化为0.940。测量的近衍射极限光束质量为M2 x = 1.19和M2 y=1.18。：

We demonstrate a TEM00-mode orthogonal dual-plate Yb:KG(WO₄)₂ (Yb:KGW) laser oscillator with high average power. The polarization anisotropy of the thermal lens was investigated, and astigmatism was mitigated based on the orthogonal dual plates. Moreover, the laser polarization was directly controlled by adjusting the net gain of the two crystals. Due to the effective heat distribution, the maximum output power was significantly improved compared to that of a single crystal. For an absorbed pump power of 52.4 W, the 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. The measured near-diffraction-limited beam quality was M²ₓ = 1.19 and M²ᵧ = 1.18.