Abstract
Wavelength-switching performance and thermal lens effect of cryogenic Yb:YAG lasers pumped by a 940 nm laser diode are presented. A maximum continuous wave output power is reached 13.16 W at 80 K with an optic-optic efficiency of 25.6% at an incident pump power of 60 W. The wavelength-switching performance is observed and explained by absorbed pump power threshold behavior as temperature. Moreover, we directly characterize the thermal lens effect by wavefront measurement with a Shack-Hartmann wavefront sensor. The wavefront peak-to-valley value (PV) is 0.338 µm (about 0.33λ) at 80 K, corresponding to a thermal lens dioptric power of 0.15 m-1. The substantial decrease of the thermal lens effect contributes to the significant improvement of laser performance, which is consistent with the brilliant beam quality factor M2 of about 1.10 at both x and y directions.
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