| 摘要 |
<p>A laser-assisted material-machining device comprises a laser (14) for providing a pulsed laser beam (16), a measuring arrangement (30, 32, 34, 36, 38) in order to obtain measured values of a fundamental-wave power of the laser beam and also of a power of at least one higher harmonic generated from the laser beam by frequency multiplication, and an evaluating unit (22) connected to the measuring arrangement, which has been set up to examine the quality of the laser beam (16) in a manner depending on the measured fundamental-wave power, on the measured power of the higher harmonic, and on a set radiant power of the laser (14). By formation of the quotient of the measured fundamental-wave power and of the measured power of the higher harmonic, the current conversion efficiency of the frequency multiplication can be ascertained. Said conversion efficiency is a measure of the quality of the wavefront and of the pulse duration of the laser beam (16).</p> |
