Design of LD end-pumped 1319nm vortex hollow laser

This manuscript designs a compact LD single emitter end-pumped 1319 nm vortex laser. In order to compress the divergence angle and meet the requirements of compact design, a fast-axis and slow-axis integrated collimating lens was designed, with X and Y divergence angles of 1.87° and 0.99° after collimation. On this basis, a hollow pump beam was obtained by using a plano-convex lens and an axicon-lens. By simulating the pump beam at different angles of the axicon-lens, an ideal hollow pump light was obtained by using an axicon-lens with a cone angle of 20°. A bonded crystal of Nd: YAG and V: YAG was used, which utilizes selective dielectric coatings on the crystal end facets to suppress laser oscillation at 1064 nm and 1338 nm, and 1319 nm laser can be obtained. Subsequently, the heat dissipation structure for the pump module and the bonded crystal module was designed and the feasibility of the heat dissipation model was verified through ANSYS simulation.