A fast measuring device for laser damage threshold of optical thin film

Abstract

The invention discloses a fast measuring device for laser damage threshold of an optical thin film, which comprises a host computer (1), a system controller (2), a laser power supply (3), a laser (4), a beam splitter A (5), a laser beam Irradiation unit, energy density calibration unit, optical film damage identification unit, pulse width detection unit (8) and one-dimensional motion table (9); Unit A (501) and beam splitting and focusing unit B (602) realize uniform beam splitting of the incident laser beam, a single pulse realizes radiation measurement of no less than 10 array test points, and the light field intensity distribution of each focus point is uniform, The energy deviation between each sub-beam is not more than ±1%. The arrangement of each sub-spot on the focal plane is 1×N or N×N. Compared with the traditional single-shot pulse, only one test point is measured, and the measurement cycle is shortened by ten. times, the laser damage threshold of optical thin films can be quickly and accurately measured.

Description

technical field [0001] The invention relates to a fast measuring device for laser damage threshold of an optical thin film, which belongs to the technical field of laser testing. Background technique [0002] Optical thin films are the weakest link in lasers and their applied optical systems. The damage of the optical thin film causes changes in the properties of the laser beam transmitted in it, destroys the quality of the laser beam, causes beam phase and wavefront distortion, and even causes catastrophic damage to the laser. [0003] However, the current measurement of laser damage threshold mainly uses laser beams to directly irradiate optical films, and laser irradiation can only test one measurement point at a time, while 1-ON-1, R-ON-1 and S-ON-1 The test method requires that the same pulse energy density be irradiated no less than 10 times to obtain the damage probability under the irradiation energy density. Due to the poor energy consistency between the laser outp...

AI Technical Summary

Problems solved by technology

Damage to the optical film causes changes in the properties of the laser beam transmitted in it, destroys the quality of the laser beam, causes beam phase and wavefront distortion, and can even cause catastrophic damage to the laser

[0003] However, the current measurement of laser damage threshold mainly uses laser beams to directly irradiate optical films, and laser irradiation can only test one measurement point at a time, while 1-ON-1, R-ON-1 and S-ON-1 The test method requires that the same pulse energy density be irradiated no less than 10 times to obtain the damage probability under the irradiation energy density. Due to the poor energy consistency between the laser output pulses, it is impossible to accurately control the radiation under the same pulse energy density. According to the requirements of multiple points; and the measurement process often needs to test hundreds of points, the measurement accuracy is low, the efficiency is extremely low, and it cannot objectively and accurately reflect the laser damage threshold of the film

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