A Method for Simultaneously Measuring the Reflectance and Transmittance of High Reflection/High Transmission Optical Elements Based on Optical Cavity Ring-Down Technology

Abstract

The invention relates to a method for simultaneously measuring the reflectivity and transmittance of a high-reflection / high-transmission optical element based on the optical cavity ring-down technology. The ring-down time of the initial cavity is obtained by fitting. Then add the high reflection / high transmission optical element to be tested to form a stable test optical cavity, measure the ring-down signal output from the optical element to be tested and the output cavity mirror respectively, and obtain the ring-down time of the test optical cavity by fitting. The reflectivity of the reflective optical element or the transmittance of the high-transmission optical element; at the same time, the ratio of the amplitude of the optical cavity ring-down signal output by the optical element to be tested and the amplitude of the optical cavity ring-down signal output by the output cavity mirror is calculated. Scale to get the transmittance of a highly reflective optical element or the reflectance of a highly transmissive optical element. This measurement method can not only measure the reflectivity and transmittance of high-reflection / high-transmittance optical elements, but also realize high-resolution two-dimensional imaging of their reflectance and transmittance distributions.

Description

technical field [0001] The present invention relates to the technical field for measuring the reflectance / transmittance of high reflection optical elements or high transmission optical elements, in particular to a single point for simultaneously measuring high reflection optical elements or high transmission optical elements based on optical cavity ring down technology Method of reflectance / transmittance and its two-dimensional distribution of reflectance / transmittance. Background technique [0002] High reflection optical elements and high transmission optical elements are widely used in high power laser systems, gravitational wave detection, laser gyroscope and other technical fields. With the advancement of coating technology, the reflectance / transmittance of high reflection / high transmission optical components is getting higher and higher, and it is particularly important to accurately measure the reflectance / transmission of high reflection / high transmission optical comp...

AI Technical Summary

Problems solved by technology

Spectrophotometric technology can also be used to measure the reflectance of optical components, but the measurement accuracy is affected by the fluctuation of light source intensity, and the typical reflectance / transmittance measurement accuracy is ±0.1-0.3%

[0005] Using different devices to measure the single-point reflectance and transmittance of high-reflection / high-transmission optical components can neither ensure that the same component position is tested, nor that the optical components are in the same state, and the device is relatively complicated and cumbersome to operate

At present, there is no measurement method that can measure the reflectance and transmittance of high reflection / high transmission optical elements at the same time. The measurement device for reflectance / transmittance two-dimensional scanning imaging is very necessary

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