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We present an experimental study on the cavity-atom ensemble system, andrealize the doubly-resonant cavity enhanced electromagnetically inducedtransparency, where both the probe and control lasers are resonant with aFabry-Perot cavity. We demonstrate the precise frequency manipulating of thehybrid optical-atomic resonances, through either temperature or cavity lengthtuning. In such a system, the control power can be greatly enhanced due to thecavity, and all-optical switching is achieved with a much lower control laserpower compared to previous studies. A new theoretical model is developed todescribe the effective three-wave mixing process between spin-wave and opticalmodes. Interesting non-Hermitian physics are predicted theoretically anddemonstrated experimentally. Such a doubly-resonant cavity-atom ensemble systemwithout a specially designed cavity can be used for future applications, suchas optical signal storage and microwave-to-optical frequency conversion.

Doubly-resonant-cavity electromagnetically induced transparency