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Abstract
Light from a monolithic Nd:YAG non-planar ring oscillator laser was phase modulated using a low-phase-noise 12 MHz crystal oscillator driving a LiNbO3 electro-optic modulator. An upper limit to the additional amplitude spectral density of phase noise arising from the modulation process was measured to be 4×10-8 rad/(Hz)1/2 over an 800 Hz bandwidth around the modulation frequency. This noise is in addition to the intrinsic phase noise of the oscillator. This is significantly less than that required by the GEO 600 gravitational wave detector.
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