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We report a velocity selective bi-polarization spectroscopy (VS-BPS)technique to generate a background-free, dispersion-like reference signal whichis tunable over a wide range of frequency. In this technique, a pair oflinearly polarized weak probe beams passing through a gas cell of metastableKrypton (Kr*) atoms, overlaps with a pair of counter-propagating circularlypolarized strong pump beams derived from an independently tunable controllaser. The polarization spectroscopy signals from the two probe beams, aftersubtraction, result in VS-BPS signal. The spectral shifting in VS-BPS signalcan be achieved by tuning the frequency of the control laser. The dependence ofthe amplitude and slope of the VS-BPS signal on the RF power used forexcitation of Kr atoms in the gas cell and on the power of pump beams has beenstudied. The frequency stability of a diode laser locked with VS-BPS signal hasbeen found to be better than the frequency stability of the laser locked with asaturated absorption spectroscopy (SAS) signal. The VS-BPS signal is finallyused for stabilization and tuning of the cooling laser frequency for amagneto-optical trap (MOT) for Kr* atoms.

Velocity selective bi-polarization spectroscopy for laser cooling of metastable Krypton atoms