LASER DEVICE AND DETERIORATION DETERMINATION METHOD OF OPTICAL ELEMENT

原文（中国語）

A laser device includes an optical element arranged on an optical path of laser light; a movement mechanism configured to move the optical element in a direction along a surface of the optical element on which the laser light is incident; a beam measurement device configured to measure the laser light via the optical element; and a processor configured to acquire first output data output from the beam measurement device when the laser light is radiated to a first portion of the optical element, move the optical element after acquiring the first output data by driving the movement mechanism, acquire second output data output from the beam measurement device after the movement when the laser light is radiated to a second portion of the optical element different from first the portion, and determine deterioration of the optical element based on the first output data and the second output data.