Phase-sensitive amplification of an optical field using microwaves
Résumé
We report phase-sensitive amplification (PSA) of a near-infrared electromagnetic field using room-temperature 85 Rb atoms possessing ground-state coherence. Our novelty is in achieving significant optical PSA by manipulating the intensity and phase of a frequency-separated microwave field. PSA is obtained by inducing a three-wave mixing nonlinear process utilising a three-level cyclic scheme in the D1 manifold. We achieve a near-ideal PSA with a gain of 7 dB over a range of 500 kHz bandwidth with very low pump-field intensities and with low optical depths. Such a hybrid, ground-state-coherence-assisted PSA is the first such demonstration using atomic ensembles.
Domaines
Physique Quantique [quant-ph]
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