Thermal analysis of the direct pumping process in a 1064-nm non-planar-ring-oscillator Nd:YAG laser

摘要

A theoretical model is analyzed to evaluate the laser emission efficiency and the ratio of heat generation in the gain medium which are calculated by the output optical laser power vs the amount of absorbed power. During the lasing process, the total of absorbed power in the Nd:YAG crystal is obtained around 5.8-W with the 7.6-W incident power by measuring the thermal cooling power of the gain medium. The slope efficiency of the Nd:YAG NPRO laser is obtained of 78.7% experimentally, which approaches the quantum limit of 79% theoretically. This newly realized feature in the Xd:YAG NPRO laser allows for increased energy efficiency and hence less demanding on the heat management, a feature that is especially relevant to laser power upgrade in the ground-based gravitational wave detectors as well as developing laser sources for space-borne gravitational wave detectors.