Crystal birefringence test system based on adjustable broadband laser

Abstract

The invention discloses a crystal birefringence test system based on adjustable broadband laser. The crystal birefringence test system comprises a laser, a light path unit, an electric signal processing unit and a data processing unit, according to the invention, the phase delay variation is used as a measurement index of crystal stress birefringence, and the optical path unit capable of comparing birefringence phase delay deviation degree in real time when the crystal is pressurized and not pressurized is used; the photoelastic coefficients of the crystal material under the pressurized state and the non-pressurized state under the irradiation of different wavebands of laser are measured at the same time by combining the electric signal processing unit and the data processing unit, and birefringence measurement and phase retardation deviation degree comparison under the difference pressure state and the non-pressurized state of the crystal under the broadband adjustable laser are achieved. The device is high in measurement precision, simple in structure and easy to implement, and effectively fills the blank of stress birefringence test of the crystal material under the pressurization condition in the prior art.

Description

technical field [0001] The invention belongs to the technical field of optical material stress measurement, and in particular relates to a crystal birefringence test system based on an adjustable wideband laser. Background technique [0002] With the continuous development of optical technology, optical materials for various purposes have gradually entered the public's field of vision, among which crystal materials are one of the most commonly used optical materials in optical systems, and their application range is very wide, involving military, aerospace, medical and communication and other aspects. Because the internal structure of most crystal materials is inhomogeneous, and when light propagates in a heterogeneous body, its propagation speed and refractive index value change with the vibration direction, resulting in birefringence. In the application of various fields, the birefringence of the crystal material will cause the deterioration of the image quality, cause th...

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Problems solved by technology

However, looking at the research on the stress birefringence of crystal materials at home and abroad, most of them stay in the visible light band, and there are very few studies on the infrared band. It is used to measure the crystal stress birefringence in the visible and infrared adjustable band Coefficient equipment is blank

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