Abstract
The high-power continuous-wave laser performance of the monoclinic Yb:LaCa4O(BO3)3 crystal was investigated for the first time, revealing complex output-coupling-dependent polarization state varying behavior when a Y-cut crystal was utilized. Under a low output coupling of 1%, the laser oscillation was dominated by the E//X polarization component, producing an output power of 11.0 W with an optical conversion efficiency of 62% and a slope efficiency of 67%, with respect to incident pump power. Dual-polarization laser action was realized under an output coupling of 3% over the entire operational region, and a total output power of 10.2 W was generated at 17.7 W of incident pump power with a slope efficiency of 61%, the output power ratio between the E//X and E//Z components was measured to be 1:1.2.
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