High-accuracy resetting technology-based damage threshold measuring method and device

Abstract

The invention relates to a high-accuracy resetting technology-based damage threshold measuring method and device. The high-accuracy resetting technology-based damage threshold measuring method comprises the following steps of: fixing a tested sample on an electric translation table to obtain an image sequence of each measuring point of the tested sample before and after radiation of a pumping laser; comparing the image sequences obtained before and after radiation, judging whether the sample is damaged according to the difference, controlling the tested sample to return to the position in which damage occurs and performing one-step check on a damage point; and improving the energy of the pumping laser, and repeatedly obtaining the image sequence of the tested sample after radiation to realize measurement of the same region of the tested sample under radiation of different energies of the pumping laser. The high-accuracy resetting technology-based damage threshold measuring device comprises the pumping laser, the electric translation table, a lighting source and a damage monitoring component, wherein the pumping laser is used for emitting pumping laser; the electric translation table is used for driving the tested sample to move; and the damage monitoring component is used for real-time monitoring and acquisition of an image of the tested sample. Compared with the prior art, the measuring device has the advantages of high damage recognition accuracy, simple device structure and the like.

Description

technical field [0001] The invention relates to a method and a device for testing the laser damage resistance of an optical element, in particular to a method and a device for measuring a damage threshold based on a high-precision reset technology. Background technique [0002] Optical components are widely used in laser processing, laser weapons, and high-power laser systems, and are essential components in optical systems. With the continuous improvement of laser output energy, the laser damage threshold of optical components has become a key factor restricting the further development of strong laser technology, and it is also a weak link that restricts the development of laser technology in the direction of high energy and high power. In order to deeply analyze the damage performance and damage mechanism of optical components and accurately evaluate the laser damage resistance of optical components, it is necessary to continuously develop and improve the measurement techn...

AI Technical Summary

Problems solved by technology

However, the photoelectric signal detection technology is an indirect identification method, which cannot directly obtain the relevant data of the damage point, and its recognition accuracy is limited by the intensity of scattered light at the damage point and the signal calibration accuracy; in addition, due to changes in the photoelectric signal, Damage judgment and motor coordinate reading involve multiple software analysis processes, which will introduce a certain calculation time and delay time, resulting in deviations between the actual coordinates and the read coordinates

Especially when the motor is moving at high speed, the speed is generally greater than 2mm / s. At this time, every 1ms delay will cause a coordinate position deviation of at least 2μm, and the process of data collection, analysis and judgment will generally cause several ms, or even tens of ms delay, thus greatly reducing the recognition accuracy of damage point coordinates

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