Abstract
The negative and positive thermal focal lengths for 1047 nm and 1053 nm were respectively demonstrated through analyzing different thermal lensing effects along the π- and σ-polarizations in a plane-parallel resonator. A compact and efficient diode-end-pumped 1053 nm Nd:YLF polarized laser is presented. As high as 11.2 W output power of the polarized 1053 nm laser has been obtained at an absorbed pump power of 22.3 W with an optical–optical efficiency of 50% and a slope efficiency of 53%. With the aid of a ray propagation matrix and a λ/4 wave plate, different thermal lensing effects for the π- and σ-polarizations have been theoretically analyzed and experimentally verified.
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