Method for testing laser damage threshold of optical thin film

Abstract

The invention relates to a method for testing a laser damage threshold of an optical thin film. The method comprises the following steps: S1, obtaining laser energy density Fth of the optical thin film during single-pulse laser damage through test; S2, irradiating the optical thin film by the single-pulse laser, recording laser damage area boundary coordinates (xi, yi) when the laser damage boundary on the surface of the optical thin film is not increased any more, and meanwhile, recording the number n of times of single-pulse laser irradiation; S3, comparing Gaussian distribution of the laserenergy density with laser damage area distribution to obtain a laser damage threshold FN of the optical thin film during multi-pulse laser irradiation damage; and S4, continuously changing the incident laser energy density, and repeatedly executing the steps S2 and S3 to obtain a laser damage threshold curve of the optical thin film under the irradiation of femtosecond laser with different pulsenumbers. The method has the beneficial effects that the measurement accuracy of the laser damage threshold of the optical thin film under multi-pulse laser irradiation is guaranteed, and meanwhile, the test efficiency of the damage threshold of the optical thin film under multi-pulse laser irradiation is greatly improved.

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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