A polarization diffraction grating structure

Abstract

The invention discloses a novel polarization diffraction grating structure, which comprises a base layer and a grating layer, and is characterized in that block areas of the grating layer are different in grid bar direction, cycle and duty ratio; and the grating layer is located above the base layer and formed through exposure, development and etching. The novel polarization diffraction grating structure disclosed by the invention can overcome the defect that a traditional diffraction grating has only one degree of freedom in parameter adjustment, distribution of transmission light of a grating is controlled from three degrees of freedom so as to achieve a beam splitting / combining function for any beams, and the theoretical beam splitting / combining efficiency reaches 99%. In addition, the size of a grating device is small, and the novel polarization diffraction grating structure can be applied to the fields of anti-reflection devices, coherent polarization beam combination, Stokes parameter measurement, biological imaging, optical communication and the like.

Description

1. Technical field [0001] The invention belongs to the field of laser technology and relates to a polarization diffraction grating structure, in particular to a grating device with high beam splitting / combining efficiency. 2. Background technology [0002] As a kind of diffractive optical device, optical diffraction grating has been widely used by people. It has a periodic spatial structure and is generally made by etching on a medium or metal to form an equivalent refractive index modulation. Optical diffraction gratings can be divided into transmission gratings and reflection gratings. The diffraction order of a diffraction grating is mainly determined by the grating period and the wavelength of the incident light. [0003] Current dynamics and main problems of laser beam splitting / combining systems: [0004] 1. The traditional laser beam splitting / combining system uses Damman gratings, which can divide a beam of coherent light into several beams of coherent light of equ...

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Problems solved by technology

[0006] Aiming at the above defects and improvement needs of the prior art, the present invention provides a high-efficiency polarization diffraction grating structure and manufacturing method in order to solve the problem of uneven far-field light field distribution and uneven laser output power in the existing beam combining system. High and low conversion efficiency

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