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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Multi-Frequency Diode Laser for Pumping CPT Resonances

Alina Isakova, Савинов Константин Николаевич, А. К. Дмитриев

Published Jun 1, 2019• 0 citations
Publisher

Abstract

To reduce the light shifts of the coherent population trapping (CPT) resonances, it was proposed to use a multi-frequency radiation of a femtosecond laser [1]. However, due to the fact that the emission spectrum of a femtosecond laser is many times larger than the width of the optical transitions used to pump the CPT resonances, data on successful experiments are not available.

DOI
10.1109/cleoe-eqec.2019.8872664

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To reduce the light shifts of the coherent population trapping (CPT) resonances, it was proposed to use a multi-frequency radiation of a femtosecond laser [1]. However, due to the fact that the emission spectrum of a femtosecond laser is many times larger than the width of the optical transitions used to pump the CPT resonances, data on successful experiments are not available.
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).
A new source of the bichromatic laser field with a stable mean value of the difference frequency is used to study coherent population trapping (CPT). A high stability of the difference phase of the fields of the radiation source is achieved by phase locking the radiation frequency of two semiconductor lasers to longitudinal modes of a femtosecond laser. The first experimental results on the spectroscopy of CPT resonances in rubidium are presented. The possibility of using the new method for spectroscopy of CPT resonances in rare-earth atom vapours is discussed.
This paper presents the search for physical mechanisms and on their basis of selective modulation of the optical frequencies in a distribution of multi-frequency laser radiation is one of the most important problems whose solution will greatly expand the capabilities of existing systems DWDM. One well-known physical effects, providing effective selective interaction of optical radiation with a material medium is the interaction of electromagnetic fields with three-level, or Λ systems. In these three-level system is observed fundamental physical phenomenon a coherent population trapping (CPT). One of the first practical examples of the CPT is to stabilize the emission frequency of optical frequency standards for optical bench, which is a resonance of CPT.