Method for regulating high power laser apparatus light path alignment

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.