A Method for Generating Ring Beam Based on Liquid Crystal Phased Array

Abstract

The invention relates to a method for generating an annular beam based on a liquid crystal phased array, belonging to the technical field of beam shaping, comprising the following steps: determining the inner diameter and outer diameter of a target annular beam; and first deflecting the incident beam by the first liquid crystal phased array to form Conical divergent beam; when the diameter of the conical divergent beam is the same as the outer diameter of the target annular beam, the second liquid crystal phased array deflects the conical divergent beam twice to obtain the target annular beam. The optical system of the present invention is simple, The device technology involved is mature. Compared with the traditional geometric transformation technology, it has the advantages of low debugging difficulty and accurate and controllable surface shape. At the same time, by applying programmable control to the first liquid crystal phased array and the second liquid crystal phased array The driving voltage can conveniently, flexibly and precisely control the deflection angle value dynamically, and then change the divergence angle, inner diameter and outer diameter of the target ring beam to match the requirements of different types of cassette systems for the ring beam.

Description

Technical field [0001] The present invention belongs to the field of beam shaping, and in particular, to a method of generating an annular beam based on a liquid crystal phase array. Background technique [0002] Kascellin telescope launch system (referred to as card system), due to its compact, easy to achieve large-diameter beam, non-color difference, high reflection efficiency, is often used in high-power large-diameter laser emission systems. However, in the card system, since the secondary mirror is located in the primary mirror transmitting optical path, and the center of the main mirror has a ring, when used for an alternate, the circular beam will cause the incident to become a ring beam after the beam. That is, the center of the launch system is blocked. The conception of the center will make the most concentrated part of the energy to be wasted and cannot function. On the other hand, the laser that is blocked will become a stray light, which requires effective managemen...

AI Technical Summary

Problems solved by technology

The traditional technology generally has the following defects: 1. Although the perfect transformation can be realized theoretically without any aberration, the complex mirror group has problems of difficult processing and assembly, and small deviations will bring obvious errors to the system

2. The mirror group designed and processed for a specific cassette system can only produce a specific annular beam that matches it. When the central blocking ratio of the cassette system changes, it is no longer applicable

3. It only transforms the geometric shape of the beam, but does not improve the laser divergence angle

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