Abstract

Dark resonance in coherent population trapping of lithium atoms in the ground state is measured by detecting atomic light emission. Compared to transmission detection, emission detection improves the signal-to-noise ratio of the resonance signal at low temperatures, extending the lower temperature limit to $220{^ \circ}{\rm C}$. This corresponds to an atomic density, 1 order of magnitude smaller than the saturated density required in transmission detection. In Ar gas, the resonance width at a low temperature is found to be decreased to 45 Hz, which is as narrow as in He and Ne gases.

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