Laser beam-expanding dodging device based on microlens array

Abstract

The invention relates to a laser beam-expanding dodging device based on a microlens array and belongs to the field of laser beam expansion. The laser beam-expanding dodging device sequentially consists of a first level microlens array, an iris diaphragm and a second level microlens array which are located on a same straight line, and screen edges of the first level microlens array, an iris diaphragm and a second level microlens array are parallel to form a coaxial system, wherein the microlens element parameters of the first and second level microlens arrays are same, the microlens element diameter is p, and the rear focal distance of the microlens arrays is f; the diameter of the first level microlens array is D1, the maximum diameter of the iris diaphragm is D2, the diameter of the second level microlens array is D3, the distance between the two microlens arrays is d, and the distances from the iris diaphragm to the first and second level microlens arrays are respectively f and d-f. According to the dodging device provided by the invention, the microlens array replaces a single lens designed beam-expanding system, so that the aberration quality of a beam-expanding optical system is improved, the system structure is simplified, the beam-expanding ratio is improved and the precision demand on system adjustment is reduced.

Description

technical field [0001] The invention belongs to the field of laser beam expansion, and relates to an optical system based on a microlens array optical element, which can be used for laser beam expansion and laser projection. Background technique [0002] The traditional laser beam expander is composed of two single lenses (focusing mirrors). The former lens focuses the laser beam on its image focus (which is also the object focus of the latter lens), and the latter lens focuses the laser beam on the focal plane. The light is transmitted as parallel light, and the beam expansion ratio is related to the focal length ratio of the front and rear lenses. This anti-telescopic beam expander system must use a larger-diameter lens in order to obtain a large beam expansion ratio, and the large-diameter lens is difficult or even impossible to process or assemble; and the system quality and The volume is very large and requires high adjustment accuracy: more seriously, because the tran...

AI Technical Summary

Problems solved by technology

Its limitation is that it cannot accommodate spatial filtering or large-scale beam expansion

[0005] The Kepler telescopic beam expander is composed of two convex lenses, and its main disadvantage is that it has a large aberration

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