Abstract
ABSTRACT We describe a low frequency noise laser system conceived for the readout of small mechanical vibrations. The system consists of a Nd:YAG source stabilized to a high Finesse Fabry-Perot cavity and achieves the bestperformance in the range 1—10 kHz, with a minimum residual noise of 4 x iO Hz//i We perform anextended characterization of the frequency stability by means of an independent optical cavity and we alsomeasure the residual fluctuations after transmission through an optical fiber. Our apparatus is optimized forthe use in an optical readout for the gravitational wave detector AURIGA, where a laser system with the characteristics here reported will allow an improvement of one order of magnitude in the detector sensibility.Keywords: frequency stabilization, gravitational waves ,opticalsensor 1. INTRODUCTION An important task for precision metrology is monitoring extremely small vibrations. The recent and still increasing progresses in opto-electronics, in particular concerning laser stabilization and high quality optical
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