Abstract

We have demonstrated laser frequency offset locking via the ${\mathrm{Rb}}^{87}$ tripod-type double-dark resonances electromagnetically induced transparency (EIT) system. The influence of coupling fields’ power and detuning on the tripod-type EIT profile is studied in detail. In a wide coupling field’s detuning range, the narrower EIT dip has an ultranarrow linewidth of $\sim 590\mathrm{kHz}$, which is about one order narrower than the natural linewidth of ${\mathrm{Rb}}^{87}$. Without the additional frequency stabilization of the coupling lasers, we achieve the relative frequency fluctuation of 60 kHz in a long time of $\sim 2000\mathrm{s}$, which is narrower than the short-time linewidth of each individual laser.

© 2014 Optical Society of America

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