Semi-circumferential LD arrays symmetrically-pumped solid-state lasers

To reduce the asymmetry of the output laser beam caused by the geometry of the conduct-cooled laser crystal in side pumped solid-state lasers,two pump modules were symmetrically placed and a semi-circumferentially mounted LD arrays were taken in each pump module.Numerical calculation and experiment were made,a maximum output power of 63.6mJ was gotten with 276mJ pump power at a frequency of 20Hz,the slope efficiency was 34%.Both numerical and experimental results prove the symmetrical geometry can effectively improve the beam quality and approximate symmetrical laser distribution can be obtained.