Loiko Pavel, Manjooran Sujith, Yumashev Konstantin, Major Arkady
Appl Opt. 2017 Apr 1;56(10):2937-2945. doi: 10.1364/AO.56.002937.
Thermal lensing was studied in an N-cut monoclinic Yb:KY(WO) (Yb:KYW) laser crystal under high-power diode pumping at ∼980 nm, for the two principal light polarizations, E||N and E||N. For both polarizations, the thermal lens (TL) was positive. It was found that operation of an Yb:KYW laser with the E||N polarization corresponds to a weaker TL that results in a better quality of the laser beam and superior power scaling capabilities. The sensitivity factors of the TL in this case were M=0.37 and 0.57 m/W for the mg and pg principal meridional planes, respectively, and the astigmatism degree was as low as S/M=35% (for a pump beam radius of w=175 μm). The photoelastic terms, fractional heat loading, and generalized thermo-optic coefficients were evaluated.
在约980 nm的高功率二极管泵浦下，研究了N切割单斜Yb:KY(WO)（Yb:KYW）激光晶体中两种主要光偏振（E||N和E||N）情况下的热透镜效应。对于这两种偏振，热透镜（TL）均为正。研究发现，Yb:KYW激光器在E||N偏振下工作时，热透镜效应较弱，从而导致激光束质量更好且功率缩放能力更强。在这种情况下，热透镜在mg和pg主子午面的灵敏度因子分别为M = 0.37和0.57 m/W，像散度低至S/M = 35%（泵浦光束半径w = 175 μm）。评估了光弹项、分数热负载和广义热光系数。
