Ultraslow light propagation in an inhomogeneously broadened rare-earth ion-doped crystal.
We show that coherent population oscillations effect allows us to burn a narrow spectral hole (26 Hz) within the homogeneous absorption line of the optical transition of an erbium ion-doped crystal. The large dispersion of the index of refraction associated with this hole permits us to achieve a group velocity as low as 2.7 m/s with a transmission of 40%. We especially benefit from the inhomogeneous absorption broadening of the ions to tune both the transmission coefficient, from 40% to 90%, and the light group velocity from 2.7 m/s to 100 m/s.
Baldit
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E
Laboratoire de Photonique et de Nanostructures LPN-CNRS UPR 020, Route de Nozay, 91460 Marcoussis, France.
Bencheikh
K
K
Monnier
P
P
Levenson
J A
JA
Rouget
V
V