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We report on the demonstration of Doppler-free polarization spectroscopy ofthe D2 line of 6Li atoms. Counterintuitively, the presence of an Ar buffer gas,in a certain pressure range, causes a drastic enhancement of the polarizationrotation signal. The observed dependence of the signal amplitude on the Arbuffer pressure and the pump laser power is reproduced by calculations based onsimple rate equations. We performed stable laser frequency locking using adispersion signal obtained by polarization spectroscopy for laser cooling of6Li atoms.

Buffer gas-assisted polarization spectroscopy of 6Li