Dynamic effects of temperature-dependent aberration factors on the beam quality of LD end-pumped lasers

Abstract

Considering the temperature dependence of the thermal conductivity of the gain medium, the aberration factor of the thermal lens becomes a function of temperature. The influence of aberration factor on critical spot size is analyzed, the actual value of critical spot size is recalculated, and the range of beam quality deterioration is re-pointed. An asymmetric flat cavity experiment is built, and a symmetrical flat cavity is used as the supporting experiment. The widened beam quality degradation range and the dynamic operating point of the fundamental mode beam are pointed out. Experimental results match the simulation.