Abstract

Cavity linewidth narrowing via double-dark resonances is experimentally observed using the Rb87 Zeeman splitting sublevels. With the steep dispersion led by the interacting dark resonances in the tripod-type electromagnetically induced transparency system, we narrow the cavity linewidth to 250 kHz at room temperature. Furthermore, the position of this ultranarrow cavity linewidth can be tuned in a 60 MHz coupling field detuning range.

© 2013 Optical Society of America

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