Study of factors affecting the light shift of the CPT resonance
Motivated by recent developments in atomic frequency standards employing the
eﬀect of coherent population trapping (CPT), we propose a theoretical framework for describing
the CPT resonances. Our extended model includes several realistic experimental factors not
accounted for in the standard approaches, namely, the FM-based technique for generating the
error signal, skewed laser spectrum, etc. We provide a simple yet non-trivial analytical solution
revealing the magnitude and structure of the light shift. The performance of the model is
checked against numerical simulations, the agreement is good to perfect.