Laser performance and thermal lensing in high-power diode-pumped Yb:KGW with athermal orientation |
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Authors: | JE Hellström S Bjurshagen V Pasiskevicius |
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Institution: | (1) Department of Physics, Royal Institute of Technology, 10044 Stockholm, Sweden |
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Abstract: | A comparative, experimental study of the high-power diode-pumped laser performance and thermal lensing properties between
standard b-cut Yb:KGW and Yb:KGW cut along an athermal direction is presented. The results show that thermal lens properties
in both the b-cut and the athermal direction-cut crystals are determined by anisotropic thermal expansion in Yb:KGW. Thermal
gradients due to the pump beam cause thermal lensing even in the athermal direction-cut geometry. The thermal lens is much
weaker and less astigmatic in the athermal direction-cut crystal, for the same absorbed power. These properties allow generation
of better-quality laser beams with the athermal direction-cut crystal as compared to the b-cut crystal.
PACS 42.55.Xi; 42.60.Jf; 42.70.Hj |
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