Method for improving data processing of absorption loss measurement of optical elements

Abstract

The invention discloses a method for improving the data processing of the absorption loss measurement of optical elements. The method comprises the steps of: continuously irradiating the surfaces of the optical elements with excitation beams which are focused through a lens, wherein the interior temperature of the optical elements rises up because of absorbing the energy of incident laser beams; establishing an accurate temperature model which can better reflect the physical reality of the optical elements; based on the accurate temperature model, obtaining an optimum temperature detection position different from that adopted by an international standard ISO11551 through carrying out numerical simulation on the temperature rise at different positions of the optical elements with a certainsize and different thermal physical properties; adjusting a temperature sensor to the optimum temperature detection position to measure the temperature data on the surfaces of the optical elements; and obtaining the absorption loss values of samples by fitting the measured temperature data to a uniform temperature model adopted by the international standard ISO11551. Compared with a fixed temperature detection position adopted by the traditional international standard ISO11551, aiming at the sizes and thermal physical parameters of different optical elements to be measured, the method adopts the temperature sensor of which the position is adjustable to realize the purpose of more accurately measuring the absorption losses of the optical elements.

Description

Technical field [0001] The invention relates to the field of optical element testing, in particular to an improvement and optimization method for data processing in laser calorimetry technology for measuring the absorption loss of optical elements. Background technique [0002] In large-scale lasers and their application systems, a large number of thin-film optical components, especially reflective optical components, are used. Due to the existence of film absorption, the internal temperature of the film optical element will rise due to the laser beam irradiation during use, resulting in thermal distortion of the surface of the optical element, and catastrophic damage to the optical element in severe cases. The absorption loss directly determines the damage threshold of the optical element, and limits the power or energy that the laser and laser system can carry; at the same time, the thermal deformation of the surface of the optical element caused by the absorption loss will cau...

AI Technical Summary

Problems solved by technology

Numerical calculation results show that for optical components with small thermal conductivity and non-25mm diameter, fixing the temperature sensor at 7mm will introduce a large measurement error of absorption loss

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