Abstract
Thermal lensing was studied in an -cut monoclinic (Yb:KYW) laser crystal under high-power diode pumping at , for the two principal light polarizations, and . For both polarizations, the thermal lens (TL) was positive. It was found that operation of an Yb:KYW laser with the 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 and for the mg and pg principal meridional planes, respectively, and the astigmatism degree was as low as (for a pump beam radius of ). The photoelastic terms, fractional heat loading, and generalized thermo-optic coefficients were evaluated.
© 2017 Optical Society of America
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