Abstract
We have demonstrated laser frequency offset locking via the 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 , which is about one order narrower than the natural linewidth of . Without the additional frequency stabilization of the coupling lasers, we achieve the relative frequency fluctuation of 60 kHz in a long time of , which is narrower than the short-time linewidth of each individual laser.
© 2014 Optical Society of America
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