Ultrahigh level of frequency stabilisation of an injection locked Nd:YAG laser with relevance to gravitational wave detection

摘要

We report on measurements of the frequency noise of a highly stabilised injection locked Nd:YAG laser. We use a nested loop frequency stabilisation scheme to achieve a loop gain of ～1×10~(6) at Fourier frequencies around 1 kHz with frequency actuation applied only to the master oscillator. A frequency noise level of ～2×10~(-5) HzHz~(-1/2) was measured for the master laser around this frequency using an independent, narrow line width, suspended analyser cavity. Furthermore we demonstrate that the frequency noise performance of the injection locked slave laser is identical to that of the master oscillator to this level. This performance is very close to the frequency noise specification for gravitational wave detection by GEO 600.