RELATIONSHIP BETWEEN LASER SPECTRUM AND CPT RESONANCES UNDER MULTIFREQUENCY EXCITATION
K. N. Savinov, L. R. Stolyarova, D. M. Kotina, A. V. Krivetsky, N. N. Golovin, A. K. Dmitriev
Novosibirsk State Technical University, Novosibirsk, Russia
Keywords: coherent population trapping, frequency modulation, diode laser, light shift
Abstract
The paper presents the results of studies of coherent population trapping (CPT) resonances recorded in a cell with 87Rb vapors with the addition of a buffer gas under multifrequency excitation by radiation from an external cavity diode laser (ECDL). The laser diode injection current is modulated simultaneously by microwave (MW) and very high frequency (VHF) signals. It is found that for a certain range of VHF modulation frequencies, the CPT resonance amplitude is proportional to the product of the electric field strengths of the spectral components contributing to the resonance excitation. The proposed model for calculating the resonance amplitude is in good agreement with the experimentally obtained data.
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