Preparation method and application of crystal

Abstract

The invention relates to the fields of laser and optics, in particular to an optical crystal. In the invention, the characteristic that the crystal refractive index of crystal grown by a pulling method in the pulling direction is in layered uniform distribution is utilized, the crystal which is processed into a layered structure along the pulling direction is adopted, so that the light-passing direction is vertical or approximately vertical to the pulling direction, and a depolarization device or a position phase piece is manufactured by utilizing the characteristic that the refractive index of the type of crystal is in uneven distribution; and isotropic crystal which is processed into a layered structure along the pulling direction is adopted, so that the light-passing direction is vertical or approximately vertical to the pulling direction, and the position phase piece with disordered position phases is manufactured by utilizing cascade connection of single or multiple blocks of thetype of crystals. The invention provides a preparation method of a crystal and an application in realizing an optical depolarization device or an optical position phase piece by utilizing the crystal, therefore, the optical depolarization device or the optical position phase piece in the prior art is replaced, and various defects in the prior art are overcome.

Description

technical field [0001] The invention relates to the fields of laser and optics, in particular to optical crystals. Background technique [0002] The application of laser in communication, laser display and other fields has many advantages, such as: huge potential bandwidth capacity, high display brightness, good collimation, etc., as the application deepens, the disadvantages caused by the polarization of light and the same phase interference The impact is becoming more and more negligible. These effects include but are not limited to: polarization mode dispersion in optical fibers; polarization-dependent losses in passive optical devices, speckle (Speckle) effects in projection applications, etc. The use of depolarizers or phase plates is very effective in eliminating related problems. effective measures. Conventional depolarization methods mainly include diffuse reflection depolarization, scattering depolarization, making polarized light pass through a scattering...

AI Technical Summary

Problems solved by technology

Diffuse reflection depolarization and scattering depolarization have the problems of high loss and poor depolarization effect, while the conventional birefringent crystal depolarization method is more complicated in processing procedures, and it is difficult to achieve better depolarization effect for small spots. In terms of film production, the usual practice is to make retarders with uneven distribution of phase difference, which cannot achieve sufficient randomness in actual operation.

This undoubtedly limits the application of laser in optical communication, laser medical treatment, laser cutting, laser display and other fields

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