Method of reducing amplitude noise of solid lasers with resonator- internal frequency doubling, and an arrangement for carrying out this method

摘要

The invention concerns a method of reducing the amplitude noise of solid lasers (e.g. Nd-YAG, Nd:YAlO, Nd:YLF, Nd:YVO.sub.3, etc.) with resonator-internal frequency doubling (for example by KTP, LBO, BBO, KNbO3, LiNbO.sub.3, etc.). According to the invention, some of the frequency-doubled ejected laser radiation or the fundamental wave radiation is guided onto a photodetector (in particular a photodiode) whose electrical output signal undergoes bandpass filtering which filters out a frequency range typical of the noise. This output signal, optionally after rectification, quadrature and/or integration, is then subjected to temperature regulation or control which corrects the temperature of the frequency-doubling crystal such that the output signal is minimized after the bandpass filter and thus the amplitude noise of the laser radiation is minimized.