High-multiplying-power beam expanding system of laser beam

Abstract

The invention discloses a high-multiplying-power beam expanding system of a laser beam. The system is of a coaxial four-mirror system structure without central obscuration, an incident laser beam parallel to a principal optical axis is incident to a conical reflector of a combined conical reflector through a parabolic mirror along the light incidence direction, and is reflected through an inner cone reflector, and a ring light parallel to the incident laser beam is output; a spherical reflector reflects the ring light output by the combined conical reflector to the parabolic mirror, thus obtaining beam-expanded laser with large ring light spots and small divergence angle. As the ring light generated by the combined conical mirror not only can avoid central obscuration, but also cannot change laser divergence angle and can transmit the laser without energy loss, the system can meet the requirement on high-multiplying-power beam expanding design under the condition of no central energy loss and no central obscuration, is compact, is easy for machining and mounting of a single-point diamond machine tool, and can be widely applied to the field of laser range finders.

Description

technical field [0001] The invention relates to a beam expansion system of a laser beam, in particular to a high-magnification beam expansion of a laser beam by adopting a coaxial four-reflection structure, and belongs to the technical field of laser applications. Background technique [0002] The laser beam expander system is an important part of many laser instruments and equipment such as laser rangefinders. Its main function is to compress the spatial divergence angle of the laser and make the laser beam meet the aperture requirements to achieve long-distance ranging. The existing beam expander system design methods are mainly divided into refraction type and reflective type. The design, processing and adjustment of the refraction type beam expander are relatively simple. Chinese invention patent CN101762878A discloses a laser beam expander system, which uses two lens combinations However, the aperture of the expanded beam spot is small and the magnification is low, so i...

AI Technical Summary

Problems solved by technology

The existing beam expander system design methods are mainly divided into refraction type and reflective type. The design, processing and adjustment of the refraction type beam expander are relatively simple. Chinese invention patent CN101762878A discloses a laser beam expander system, which uses a combination of two lenses Realized, but the aperture of the expanded beam spot is small, the magnification is low, it is difficult to meet the requirement of large aperture of the exit spot

Although the reflective beam expander can increase the beam expansion ratio and reduce the length of the system, there is a problem of central occlusion, which leads to a serious loss of energy in the center beam of the Gaussian laser, making it difficult to achieve long-distance distance measurement; although the off-axis system can effectively avoid central occlusion , but its installation is very difficult

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