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Quantum Electronics

CPT resonances under multifrequency pumping

Савинов Константин Николаевич, А. К. Дмитриев, A. V. Krivetskii

Published Feb 1, 2022• 2 citations
Publisher

Abstract

Abstract The possibility of detecting coherent population trapping (CPT) resonances with combined microwave and HF modulation of the injection current of a diode laser has been demonstrated for the first time. A series of resonances is observed, separated from each other by half the RF modulation frequency.
DOI
10.1070/qel17977

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For the first time, a series of CPT resonances under the simultaneous exposure of microwave and VHF modulation of the injection current of a diode laser with an external cavity, represented by diffraction gratting, was observed. The frequency spacing between resonances was coincided with half of the VHF modulation frequency. The contribution to pumping in this case comes from pairs of VHF components located in different spectral bands and separated from each other by the frequency of hyperfine splitting of ground state of rubidium-87 atom (about 6.8 GHz). The use of multifrequency pumping will make it possible to reduce the light shifts of the observed CPT resonances due to averaging, and the use of a semiconductor laser with an external cavity opens up the possibility of creating a combined optical and radio frequency standard. The dependences of the CPT parameters of resonances on the intensity of the incident radiation are also studied in this work, and the threshold observed in this case is consistent with the results described in the literature. The dependences of the amplitude of CPT resonances on the deviation of the applied VHF modulation have also been studied. The VHF modulation frequency remained unchanged at 34 MHz (1/200 of the clock transition frequency).
Abstract The paper presents the results of studying the coherent population trapping (CPT) resonances observed in a cell with 87Rb vapor with 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 has been revealed that, for a certain band of VHF modulation frequencies, the amplitude of a CPT resonance is proportional to the product of the electrical field strengths of the spectral components contributing to resonance excitation. The proposed model of calculating the resonance amplitude is in good agreement with experimental data.
Abstract We develop a theory of modulation response of the coherent population trapping (CPT) resonance. We consider the simplest three-level atom, but take into account the polychromatic spectrum of the pumping and probing light produced by pure FM modulation of single frequency field. The analysis based on the density matrix equations rigorously includes the most important for applications range of modulation parameters where modulation frequency and deviation are comparable with or greater than the CPT linewidth, so the response of the atomic medium is not adiabatic. Some theoretical results, in particular the possibility of using a quadrature response to modulation to suppress light shift, are compared with the experiment carried out with a diode laser (VCSEL) and 87 Rb atoms.