A Laser Array Light Source Based on Liquid Crystal Geometric Phase Modulation

Abstract

The invention discloses a laser array light source based on liquid crystal geometric phase modulation. Based on the geometric phase modulation principle of liquid crystal molecules, a geometric phasearray grating is designed by controlling the arrangement direction of a main shaft of the liquid crystal molecules. The grating is insensitive to the polarization state of an incident light beam, and0-pi binary geometric phase modulation can be introduced to a fundamental mode Gaussian beam in any polarization state, so that the fundamental mode Gaussian beam is converted into a high-dimensionallaser beam array. According to the laser array light source, optical elements such as the geometric phase array grating are integrally fixed through the metal sleeve, the overall structure is compact,and good stability is achieved. The light source is reliable in structure and easy to control, can serve as a novel array structure light source to be widely applied to the frontier application fields of laser array radars, face recognition, multi-point machining, microimaging and the like, and has great progress compared with the prior art.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a laser array light source based on liquid crystal geometric phase modulation. Background technique [0002] A laser array is a special light field in which multiple identical or different laser beams are regularly arranged at a certain position on the receiving plane. As a new type of structured laser field, laser arrays have important application values ​​in areas such as area array lidar, face recognition, high-power laser synthesis, multi-point processing, microscopic imaging, and medical treatment. Early laser arrays are generally directly generated by arranging multiple lasers according to certain rules, and the system is huge and complex. Later, with the development of diffractive optics, people designed diffractive devices including pure phase gratings, digital microlens reflective arrays, liquid crystal spatial light modulators, metasurfaces, etc., which diffrac...

AI Technical Summary

Problems solved by technology

However, this method still faces the problem of not being able to generate high-dimensional beam arrays due to poor resolution.

Existing reports generally generate laser beam arrays of 7×7 and below, and there are few reports on higher-dimensional beam arrays

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