Oriented cutting method for preparing infrared non-linear optics element from yellow copper uniaxial negative crystal

Abstract

The invention relates to a directional cutting method for preparing infrared nonlinear optical elements from a chalcopyrite uniaxial negative crystal, which comprises the following steps: (1) according to cleavage surfaces {112} and {101} of the chalcopyrite uniaxial negative crystal, utilizing a crystal standard pole figure with Wuwov's intersection ruler and an X-ray diffractometer to determine the direction of a C axis of the crystal through theta-2theta continuous scanning; (2) putting the crystal of which the direction of the C axis is determined on a cutting machine, rotating a sample stage for delta theta far away from the direction of the C axis according to a phase matching angle theta m required by an optical element, and cutting the crystal to obtain an original sample of the optical element, wherein the delta theta= theta m - theta (112); (3) putting the original sample of the optical element on the sample stage of the X-ray diffractometer, determining an oscillation photograph of a cutting surface of the original sample of the optical element, and obtaining a diffraction peak place value theta' and delta theta', wherein the delta theta'=absolute (theta'- theta'(112)); and (4) finishing the optical element, and correcting the cutting surface of the original sample of the optical element until the delta theta'=the delta theta.

Description

technical field

[0001] The invention belongs to the field of preparation and processing of crystal nonlinear optical components, in particular to a directional cutting processing method for preparing infrared nonlinear optical components with chalcopyrite negative uniaxial crystals without direction characteristics. Background technique

[0002] Chalcopyrite crystals used as infrared nonlinear optical components mainly include I-III-VI compounds and II-IV-V compounds. The chalcopyrite single crystals include positive uniaxial crystals and negative single crystals. Axial crystals are generally prepared by the Bridgman-Stockbarger method (B-S method). Due to the strong constraints of the growth container, coupled with the influence of growth rate, melt viscosity, etc., the grown ingot is usually cylindrical, with no obvious directional characteristics in appearance. To accurately process it into various phase matching angles (θm) and azimuth angles ( ), such as frequency do...

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