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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

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

摘要

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.
机译:PCT号PCT / EP97 / 01364秒371日期1999年4月7日102(e)1999年4月7日PCT申请日期1997年3月19日PCT公开WO97 / 35369 PCT公布1997年9月25日,本发明涉及一种通过谐振器内部倍频(例如通过KTP)来降低固体激光器(例如Nd-YAG,Nd:YAlO,Nd:YLF,Nd:YVO3等)的幅度噪声的方法。 ,LBO,BBO,KNbO3,LiNbO3等)。根据本发明,将倍频发射的激光辐射或基波辐射中的一些引导到光电检测器(特别是光电二极管)上,该光电检测器的电输出信号经过带通滤波,该带通滤波滤除典型的噪声频率范围。然后,可选地在整流,正交和/或积分之后,对该输出信号进行温度调节或控制,该温度调节或控制校正倍频晶体的温度,从而使输出信号在带通滤波器之后被最小化,从而使信号的幅度噪声最小。激光辐射被最小化。

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