Carrier Suppression of Phase Modulated Beam Using Optical Cavity for Coherent Population Trapping Clock

Abstract

We present a method of carrier suppression of a phase coherent laser beam produced by an electro optic modulator for coherent population trapping (CPT) clock To suppress the undesired strong carrier mode of the phase modulated beam a Fabry-Perot (FP) cavity is used as an optical filter The intensity of the carrier mode is reduced by 70% without significant loss of the two first order side modes for CPT clock The contrast of the CPT signal is improved by a factor of 1 4 when the carrier suppressed phase coherent laser beam is applied to a (87)Rb CPT clock (C) 2010 The Japan Society of Applied Physics