LASER SPECTROSCOPY OF MOLECULAR CESIUM NEAR 1064 NM ENHANCED BY A FABRY-PEROT CAVITY

We made Doppler-broadened and Doppler-free absorption measurement of a cesium cell that was placed inside an external Fabry-Perot cavity, us ing a Nd:YAG laser. We achieved a cavity finesse of approximately 85, and the sensitivity of the measurement was improved by as much as 26.5 with respect to single-pass absorption. The sensitivity enhancement b y the external cavity may enable one to lock the laser frequency to 13 3Cs2 lines at relatively low temperatures, in which the frequency-depe ndent temperature shift, as well as the collision broadening, is reduc ed significantly.