Optical thin film laser damage threshold testing system and method thereof

Abstract

The invention relates to a method for testing the laser damage threshold of an optical thin film, comprising the following steps: S1, testing and obtaining the laser energy density F when the optical thin film is damaged by a single pulse laser th ; S2, making the single pulse laser irradiate the optical film, recording the laser damage area boundary coordinates (x i ,y i ), and record the number of times n of single-pulse laser irradiation at the same time; S3, compare the Gaussian distribution of laser energy density with the distribution of laser damage area, and obtain the laser damage threshold F when the optical film is damaged by multi-pulse laser irradiation N ; S4. Constantly changing the incident laser energy density, repeating steps S2 and S3 to obtain laser damage threshold curves of the optical thin film under different pulse numbers of femtosecond laser irradiation. The beneficial effect is not only ensuring the measurement accuracy of the laser damage threshold of the optical thin film under multi-pulse laser irradiation, but also greatly improving the testing efficiency of the optical thin film damage threshold under multi-pulse laser irradiation.

Description

【Technical field】 [0001] The invention relates to the field of optical detection, in particular to an optical film damage threshold testing system and a method thereof. 【Background technique】 [0002] The damage to optical films by strong lasers restricts the development of lasers to high power and high energy, and is also an important factor affecting the stability, reliability and service life of optical films. With the continuous expansion of the application range of ultra-intense and ultra-short lasers, the importance of the damage resistance of optical thin films or optical components has become increasingly prominent, and accurate and efficient testing of the damage threshold of laser thin films is a prerequisite for improving the damage resistance of laser thin films. In recent years, the International Standardization Committee has promulgated ISO11524-1 and ISO11524-2, which are international standards for damage to optical components caused by laser light. [0003]...

AI Technical Summary

Problems solved by technology

The operation steps of this method are cumbersome. Under a specific number of laser pulse irradiation, it is necessary to test multiple energy steps, and each energy step needs to test multiple points to find the maximum energy density of zero-probability damage. time, and when a large number of test samples are required

[0004] Because the existing damage testing methods for optical thin films under multi-pulse irradiation of femtosecond laser are difficult to ensure the efficiency and accuracy of the damage threshold test of optical thin films, therefore, a simple, efficient and accurate method for multi-pulse irradiation of femtosecond laser is proposed. Damage Threshold Testing Requirements for Illuminated Optical Films Are Increasingly Urgent

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