Device and method for measuring transmissivity and reflectivity of optical element with heavy calibre

Abstract

The invention provides a device and method for measuring the transmissivity and the reflectivity of an optical element with a heavy caliber. The device comprises an optical system, a photoelectric conversion and mechanical control system and a signal processing system. The optical system consists of a solid laser, a polarizer, a visible light source for regulating an optical path and preimaging, a beam expanding system, a dispersion prism and an attenuation lens; the photoelectric conversion and mechanical control system consists of a photoelectric detector, a scientific grade network CCD (Chare Coupled Device) and an element supporting platform; and the signal processing system consists of a data acquisition card, a network cable and a computer. The scientific grade network CCD monitors the position of a light spot on the photoelectric detector, feeds back and regulates the detector to the optimal position, also monitors a macroscopic scattergram of reflected or transmitted light beams and reflects the uniformity of reflectivity and transmissivity. The device and the method, provided by the invention, have the characteristics of simple structure, convenience for regulation as well as high efficiency and precision, and the precision for repeated measure is up to 0.05 percent.

Description

technical field [0001] The invention relates to optical measurement, in particular to a device for measuring the transmittance and reflectivity of large-diameter optical elements. Background technique [0002] In high-energy laser devices, the transmittance, reflectivity and uniformity of the film layer of the coated optical element, as an important technical index of the coating of the large-aperture optical element, directly affect the beam quality and energy distribution of the laser beam. However, the optical, electrical, magnetic, mechanical and other properties of the film layer of the optical element are easily affected by the environment, which in turn affects the transmittance and reflectivity of the optical element, and finally leads to the deterioration of the performance of the laser transmission. In order to help control the beam quality and improve the accuracy of laser parameter measurement, it is necessary to make scientific real-time detection of the transmi...

AI Technical Summary

Problems solved by technology

[0006] 1. Adding a chopper and a lock-in amplifier to reduce random noise introduces electronic noise that has a greater impact and increases the complexity of operation;

[0007] 2. When the device scans and measures the transmittance, reflectance and uniformity of large-aperture optical elements, it takes too long and the detection efficiency is not high. At the same time, environmental humidity, temperature and other factors may change with time, causing more Measurement error

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