Small air-cooled, heat-dissipating VCSEL end-pumped disc laser design

In this paper, a small air-cooled, heat-dissipating VCSEL end-face pumped disc laser is designed, which is end-face pumped with Nd: YVO₄ crystal in VCSEL arrays. The pump source and gain medium are mounted on the same heat sink, and the water-cooled and air-cooled heat dissipation systems are compared and simulated by ANSYS and Flow Simulation software, respectively, which verifies the feasibility of the air-cooled heat dissipation model; an aspherical lens is designed to complete the collimation of the VCSEL array by ZEMAX, and the dispersion angle of the X and Y directions after the collimation is 0.47°; A parabolic reflecting focusing mirror is designed to collect the collimated beams, and the size of the focused spot is 1.52mm×1.52mm. The heat sink is optimised by flow simulation, and the best heat dissipation effect is obtained with the parameters of fin thickness of 2mm, fin height of 37mm and fin spacing of 3mm. The overall design of the air-cooled, heat-sink VCSEL-pumped disc laser is carried out by Soilworks, and the overall dimensions of the laser are 120mm×90mm×90mm (length×width×height) (of which the length of the heat-sink system is 40mm).