Nonlinear enhanced-absorption resonances in compact alkali-vapor cells for applications in quantum metrology

D. V. Brazhnikov, S. M. Ignatovich, I. S. Mesenzova, A. M. Mikhailov, M. N. Skvortsov, A. N. Goncharov, V. M. Entin, I. I. Ryabtsev, R. Boudot, E. Taskova, E. Alipieva, C. Andreeva, S. Gateva

Research output: Contribution to journalConference articlepeer-review


We review three laser spectroscopy schemes developed recently for observation of high-contrast enhanced-absorption nonlinear resonances in small alkali-vapor cells. In our experiments, optical transitions within the cesium D1 line are involved and a probe beam transmission is analyzed. The first spectroscopy method is based on the configuration with two-frequency counter propagating beams, which are linearly polarized in orthogonal directions. This configuration provides observation of high-contrast natural-linewidth resonances superimposed on broad Doppler profiles when the laser frequency is scanned. These resonances have good prospects for developing a miniature optical frequency reference. The second scheme involves two-frequency counter propagating beams with equal circular polarizations and provides observation of subnatural-linewidth resonances when the Raman frequency detuning is scanned. We use these resonances for stabilizing the microwave frequency of a local oscillator (˜ 4.6 GHz). Frequency stability of around 6 × l0-12 is achieved at 1-s averaging using a 5-mm length cell. This result makes the technique attractive for developing a miniature frequency standard in thr microwave range. The third configuration exploits single-frequency counter-propagating beams with linear orthogonal polarizations. The ultrahigh-contrast subnatural-linewidth resonances can be observed when the longitudinal magnetic field is scanned around zero. The possible application is discussed of these resonances in vector atomic magnetometry.

Original languageEnglish
Article number012019
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 9 Apr 2021
Event21st International Conference and School on Quantum Electronics: Laser Physics and Applications, ICSQE 2020 - Virtual, Online
Duration: 21 Sep 202025 Sep 2020




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