Abstract
ABSTRACT This work is concerned with the line proles, amplitudes and widths of the coherent population trapping (CPT)resonances due to low frequency Zeeman coherences, in the Hanle conguration, applied to 87 Rb atoms in thevacuum cell. Detailed calculations of the uorescence were done with two dierent transverse intensity prolesof the excitation laser tuned to the open F g =2 F e = 1 transition. Compariso n with experiment producesgood agreement for the laser intensity dependence of CPT line-widths in the wide range of the laser intensity,when the laser transverse beam prole is Gaussian. Results for both step-like and Gaussian prole of the laserbeam show asymptotic 1/d dependence (d is the laser beam diameter) of CPT line-widths, for large range ofthe laser intensity. 1. INTRODUCTION Coherent population trapping (CPT) is a phenomenon based on atomic coherence, when two quantum pathwaysinteraction in the atomic system, a single-photon transition (connecting ground and an excited state) andtwo-photon transition (connecting two ground states), interfere destructively.
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