Long-life prediction method for laser optical component

A technology of optical components and prediction methods, applied in optical instrument testing, machine/structural component testing, instruments, etc., can solve problems such as accelerated life testing, and achieve the effect of improving test efficiency and shortening life test time.

Active Publication Date: 2021-02-05
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

However, the life of optical components cannot be accelerated by simply increasing the pulse repetition frequency. This is because the damage performance of optical components is related to the repetition frequency parameters of the laser. The change of repetition frequency may change the mechanism of damage, so it is necessary to carry out A reasonable accelerated test must be comparable to its service conditions

Method used

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  • Long-life prediction method for laser optical component
  • Long-life prediction method for laser optical component
  • Long-life prediction method for laser optical component

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Experimental program
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Embodiment

[0033] For a typical 355nm reflective film element (the stacking formula of the film is Sub|(LH)^40 4L|Air, where the L layer is SiO 2 , the H layer is Al 2 o 3 ) to carry out the life test process of laser damage threshold as follows:

[0034] Firstly, select the test points whose pulse times are within 1000 from the four groups of 1, 10, 100, and 1000. The repetition rate of the low repetition rate laser used is 1 Hz, and the repetition rate of the high repetition rate laser is 60 Hz. Through 1-on-1 and S-on-1 test methods, the threshold value of 355nm thin film components under low repetition frequency laser is 22.3J / cm 2 (1-on-1), 21.2J / cm 2 (10-on-1), 20.6J / cm 2 (100-on-1), 20.4J / cm 2 (1000-on-1). Through 1-on-1 and S-on-1 test methods, the threshold value of 355nm thin film components under high repetition frequency laser is 20.5J / cm 2 (1-on-1), 19.5J / cm 2 (10-on-1), 19.0J / cm 2 (100-on-1), 18.8J / cm 2 (1000-on-1). Bring the relationship between the threshold d...

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Abstract

The invention discloses a long-life prediction method for laser optical component, and aims to solve a problem of predicting the service life of an existing optical component used for a long time under any flux irradiation. The method comprises the following steps: performing fitting by taking laser pulse times as variables and taking damage thresholds under corresponding pulse times as dependentvariables to obtain a threshold function of the optical component under specific laser parameters; realizing a laser damage threshold test experiment with more pulse times in a relatively short time by utilizing high-repetition-frequency laser; and obtaining a life prediction function prediction model by testing a threshold function under high repetition frequency laser and a function of a threshold difference value of the high repetition frequency laser and target laser under the same pulse number to the pulse number. According to the invention, an acceleration experiment can be carried out on the service life test of the laser optical component, the test time is shortened, and the service life of the optical component under specific pulse times can be obtained by applying the test result; the method is suitable for the field of laser optical component life prediction.

Description

technical field [0001] The invention relates to laser optical components, in particular to a long-life testing method for laser optical components. Background technique [0002] The life of laser optical components is the maximum number of pulses when the optical components are exposed to a certain flux of laser radiation without growth and functional damage. Usually, the lifetime requirements of optical components are related to the operating time requirements of lasers and system devices. For the optical components of space lasers, the service life is required to be as long as several years or even more than ten years. It is unrealistic and uneconomical to test optical components for such a long time. However, there is no method for testing the life of laser components in terms of long life. [0003] The life test of general optical components is usually carried out under the conditions of use under the corresponding conditions of the life test. General accelerated test...

Claims

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Application Information

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IPC IPC(8): G01M11/00
CPCG01M11/00
Inventor 王胭脂郭可升陈瑞溢张宇辉朱晔新朱美萍张伟丽王建国孙建易葵邵建达
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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