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The Laser Guide Star Facility (LGSF), as the most important part of theadaptive optics system of the large ground-based telescope, is aimed togenerate multiple laser guide stars at the sodium layer. Laser Launch Telescopeis employed to implement this requirement by projecting the Gauss beam to thesodium layer with a small beam size in LGSF system. As the diffraction andinterference effects of laser's long-distance transmission, the conventionaloptical design based on the geometrical optics mechanism cannot achieve theexpected laser propagation. In this paper, we propose a method to designoptical system for laser launch telescope based on the physical optics theoremto generate an acceptable light spot at the sodium layer in the atmosphere.Besides, a tolerance analysis method based on physical optics propagation isalso demonstrated to be necessitated to optimize the system's instrumentationperformance. The numerical results show that the optical design consideringphysical optics propagation is highly rewarding and even necessitated in manyoccasions, especially for laser beam propagation systems.

Optical design of the laser launch telescope via physical optics theorem for Laser Guide Star Facility