46 W TEM00 output characteristic and thermal lensing effect of VPS laser under LD pumping distribution control

摘要

We built up a 32-laser-diode formed virtual point source pumping system and achieved different pump light distributions from central intense, to central uniform and central depressed ones. CW TEMinfinity operations of Nd : YAG laser were performed under these pump light distributions, and their thermal lensing effects were estimated. Results show that the operation under central depressed pump light distribution has the lowest thermal lensing effect and a higher optical-to-optical efficiency for operations performed using the same resonator parameters or within the similar stable range. The improvement in optical-to-optical efficiency is explained as a result of the reduction in the thermally induced aberration. [References: 11]