2014/05/31 by Y. B. Kale, V. B. Tiwari, S. Singh +3 · 8 citations
Chemistry · Physics and Astronomy · #Argon #Atomic and Subatomic Physics Research #Atomic physics #Chemistry #Cold Atom Physics and Bose-Einstein Condensates #Excitation #Krypton #Laser #Materials science #Optics #Physics #Polarization (electrochemistry) #Quantum optics and atomic interactions #SIGNAL (programming language) #Spectroscopy #physics.atom-ph
paper · pdf · doi:10.1364/josab.31.002531
published in Journal of the Optical Society of America B 31(11), 2531 (Optica Publishing Group) · 10 Pages, 11 figures, research article
arxiv created 2014/08/08 · openalex publication_date 2014/10/02 · arxiv updated 2014/10/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We report a velocity selective bipolarization spectroscopy (VS-BPS) technique to generate a background-free, dispersion-like reference signal which is tunable over a wide range of frequency. In this technique, a pair of linearly polarized weak probe beams passing through a gas cell of metastable krypton (Kr*) atoms overlaps with a pair of counterpropagating circularly polarized strong pump beams derived from an independently tunable control laser. The polarization spectroscopy signals from the two probe beams, after subtraction, result in the VS-BPS signal. The spectral shifting in the VS-BPS signal can be achieved by tuning the frequency of the control laser. The dependence of the amplitude and slope of the VS-BPS signal on the RF power used for excitation of Kr atoms in the gas cell and on the power of pump beams has been studied. The frequency stability of a diode laser locked with VS-BPS signal has been found to be better than the frequency stability of the laser locked with a saturated absorption spectroscopy signal. The VS-BPS signal is finally used for stabilization and tuning of the cooling laser frequency for a magneto-optical trap for Kr* atoms.