Abstract
A four-level tripod active-Raman-gain scheme is analyzed for obtaining
phase-controlled gain, phase shift, and group velocity at room temperature. The
scheme can be used to eliminate significant probe field attenuation or distortion
which is unavoidable in the scheme based on electromagnetically induced
transparency. It is shown that the intensity gain, phase shift, and group velocity
of a probe field can be simultaneously manipulated by changing the relative phase of
two pump fields. The scheme is also different from that proposed recently by Deng et
al. where a probe-field gain always exists. New features of the scheme presented
here raise the possibility of designing rapidly responding optical switches and
gates for optical information processing.
© 2009 Chinese Optics Letters
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