Method for regulating high power laser apparatus light path alignment

Abstract

A regulating method for laser device light path collimating includes the following steps: firstly, adhering a transmission grating larger than the aperture at the aperture plate behind the aperture plate of the spatial filter; secondly, starting up the laser light source, inserting a negative lens in the main light path, which allows the aperture to be fulfilled with the laser beam; the aperture profile is diffracted by the transmission grating and is imaged to the far-field detector by the imaging lens, thereby obtaining the central position of the aperture; shifting the negative lens out the light path, which allows the focal spot of the laser beam to thrill through the aperture, the focal spot is diffracted by the transmission grating and is imaged to the far-field detector by the imaging lens, thereby obtaining the central position of the focal spot; regulating the first reflecting mirror and the second reflecting mirror to superpose the central position of the focal spot of the laser beam and the central position of the aperture of the spatial filter, thereby the regulation is in good condition. The invention has features of simple equipment, easy regulate and high accuracy.

Description

technical field [0001] The invention relates to high-power lasers, in particular to a method for adjusting the optical path collimation of high-power laser devices. Background technique [0002] The current high-power laser devices used for inertial confinement nuclear fusion at home and abroad, such as the Shenguang П in my country and the NIF device in the United States, must use far-field detection devices with beam collimation to adjust the optical path. The optical axis of these far-field detection devices is generally Both are coaxial with the main laser light path. In order not to affect the main light path, its position can only be behind the reflector, and the sample is sampled through the light leakage of the reflector, such as figure 1 As shown, the first mirror 1, the second mirror 2, the spatial filter 3, and the third mirror 5 are part of the main optical path of the high-power laser device, and the far-field detection device is composed of an imaging lens 6 and...

AI Technical Summary

Problems solved by technology

[0004] The imaging lens 6 and the far-field detector 7 must be coaxial with the main optical path, and the detection system needs to be placed behind the third reflector 5 of the main optical path for sampling, which greatly increases the length of the main optical path, which is not convenient for those with a narrow space. Arrangement of Spatial Filters

Images