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Method for reducing the amplitude noise of a solid-state laser with doubled frequency inside a resonator and arrangement for implementing this method
Method for reducing the amplitude noise of a solid-state laser with doubled frequency inside a resonator and arrangement for implementing this method
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机译:降低谐振器内部频率翻倍的固态激光器幅度噪声的方法和实现该方法的装置
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PCT No. PCT/EP97/01364 Sec. 371 Date Apr. 7, 1999 Sec. 102(e) Date Apr. 7, 1999 PCT Filed Mar. 19, 1997 PCT Pub. No. WO97/35369 PCT Pub. Date Sep. 25, 1997The invention concerns a method of reducing the amplitude noise of solid lasers (e.g. Nd-YAG, Nd:YAlO, Nd:YLF, Nd:YVO3, etc.) with resonator-internal frequency doubling (for example by KTP, LBO, BBO, KNbO3, LiNbO3, 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.
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