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We have taken advantage of congruent melting behavior of the nonlinear rare-earth oxoborate Ca 4 REO(BO 3 ) 3 family to perfect a process of collective fabrication of self-frequency doubling microchip laser based on Nd:GdCOB (Ca 4 Gd 1-x Nd x O(BO 3 ) 3 ) crystals. The process goes from Czochralski boule to 1x3 mm 2 ...
A Shack-Hartmann wavefront sensor was used to measure thermal lensing in diode-end-pumped Yb-doped GdCOB, YCOB, YSO, YAG, and KGW crystals, under lasing or nonlasing conditions. Measured thermal lenses are aberration-free, and their focal lengths under lasing action range from 40 to 140 mm for 5 W of absorbed power. When laser action was inhibited the thermal lens dioptric power was increased significantly...
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