Velocity selective bi-polarization spectroscopy for laser cooling of metastable Krypton atoms
| Autor: | Kale, Y. B., Tiwari, V. B., Singh, S., Mishra, S. R., Rawat, H. S. |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | JOSA B, Vol. 31, Issue 11, pp. 2531-2539 (2014) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1364/JOSAB.31.002531 |
| Popis: | 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. Comment: 10 Pages, 11 figures, research article |
| Databáze: | arXiv |
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