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arXiv 2102.09922astro-ph.IMphysics.optics
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基于物理光学原理的Laser导引星设施laser发射望远镜光学设计

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

Yan Mo, ZhengBo Zhu, Zichao Fan, Donglin Ma

摘要:

激光导星装置(LGSF)是大型地基望远镜自适应光学系统的重要组成部分,其目标是在钠层产生多颗激光导星。LGSF系统采用激光发射望远镜将高斯光束以较小的光束尺寸投射到钠层上来实现这一要求。由于激光远距离传输的衍射和干涉效应,传统的基于几何光学机理的光学设计无法实现预期的激光传输。本文提出了一种基于物理光学原理的激光发射望远镜光学系统设计方法,以在大气钠层产生可接受的光斑。此外,基于物理光学传播的公差分析方法也被证明是必要的,以优化系统的仪器性能。数值计算结果表明,考虑物理光学传输的光学设计在许多场合,特别是激光传输系统中是非常有价值的,甚至是必要的。

英文摘要:

The Laser Guide Star Facility (LGSF), as the most important part of the adaptive optics system of the large ground-based telescope, is aimed to generate multiple laser guide stars at the sodium layer. Laser Launch Telescope is employed to implement this requirement by projecting the Gauss beam to the sodium layer with a small beam size in LGSF system. As the diffraction and interference effects of laser's long-distance transmission, the conventional optical design based on the geometrical optics mechanism cannot achieve the expected laser propagation. In this paper, we propose a method to design optical system for laser launch telescope based on the physical optics theorem to generate an acceptable light spot at the sodium layer in the atmosphere. Besides, a tolerance analysis method based on physical optics propagation is also demonstrated to be necessitated to optimize the system's instrumentation performance. The numerical results show that the optical design considering physical optics propagation is highly rewarding and even necessitated in many occasions, especially for laser beam propagation systems.

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