Velocity selective bi-polarization spectroscopy for laser cooling of metastable Krypton atoms
Abstract
We report a velocity selective bi-polarization 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 counter-propagating 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 VS-BPS signal. The spectral shifting in 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 (SAS) signal. The VS-BPS signal is finally used for stabilization and tuning of the cooling laser frequency for a magneto-optical trap (MOT) for Kr* atoms.
Keywords
Cite
@article{arxiv.1405.7477,
title = {Velocity selective bi-polarization spectroscopy for laser cooling of metastable Krypton atoms},
author = {Y. B. Kale and V. B. Tiwari and S. Singh and S. R. Mishra and H. S. Rawat},
journal= {arXiv preprint arXiv:1405.7477},
year = {2014}
}
Comments
10 Pages, 11 figures, research article