Absorption property of laser rod circle-side-pumped by LD

For the different surface treatment of the laser crystal,a mathematical model was created to describe the absorbed energy distribution in the laser crystal of the multi LD arrays circle-side-pumped solid-state lasers.Ray-tracing method was taken to calculate the distribution in the crystal.The study was mainly about the influence of the different surface treatment of the laser crystal on the distribution of the absorbed energy,and the surface treatment can restrain the amplified spontaneous emission(ASE) in the resonator but decrease the laser efficiency.The result indicates that increasing the scatter ratio of the crystal surface can restrain the ASE but reduce the laser efficiency.