Method for building laser spot homogenization system for fiber laser and system

Abstract

The invention provides a construction method of a laser spot homogenization system for a fiber laser and the system, and solves the problems of complicated structure and poor stability caused by homogenization due to the fact that homogenization design of laser spots is not facilitated for a wide-spectrum and high-power laser by existing optical lens homogenization. The method comprises the following steps: 1) designing an effective aperture D1 and a focal length f1 of a collimator objective according to the size of a light spot required to be simulated; (2) the homogenized optical fiber is connected with an optical fiber laser, and laser spot energy distribution is obtained according to the light beam divergence angle alpha of the homogenized optical fiber and the effective aperture D1 of a collimator objective; (3) searching a light spot central area which meets the uniformity requirement and has the maximum transmittance from laser light spot energy distribution; 4) designing a collimating lens, an aperture diaphragm and a focusing lens; and (5) sequentially arranging the collimating lens, the aperture diaphragm and the focusing lens designed in the step (4) at the output end of the homogenizing optical fiber to finish the construction of the laser spot homogenizing system.

Description

technical field [0001] The invention belongs to the field of space optical target simulation, and in particular relates to a design method for a laser spot homogenization system used for a fiber laser and a laser spot homogenization system constructed by the method. Background technique [0002] In order to ensure the normal operation of the satellite in orbit, ground simulation of the space environment where the satellite is located is required. In order to avoid errors in the information extraction of the target caused by the uneven distribution of light intensity irradiated by the light source to the target, it is necessary to ensure that the spot of the simulated target is uniform, that is, the laser spot needs to be homogenized. [0003] Existing laser spot homogenization methods mainly include optical fiber homogenization, optical lens homogenization, Fresnel lens homogenization, diffractive optical element homogenization, and microlens array homogenization. At presen...

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Problems solved by technology

[0005] In order to solve the technical problem that the homogenization of the existing optical lens is not conducive to the homogenization design of the laser spot for wide-spectrum and high-power lasers, and the realization of homogenization will easily lead to complex system structure and poor stability, the present invention Provided is a method for building a laser spot homogenization system for fiber lasers and the system

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