We report on a tunable all-optical delay line for pulses with frequency tuned between absorption lines in hot Rb vapour. Optical pulses of 10 ns duration were delayed by more than 40 ns with reasonable transmission. The use of two isotopes allows the delay to be increased or decreased through optical pumping, permitting rapid tuning over a large fraction of the unmodified delay. We investigate the frequency and intensity range over which this delay line can be used.

© 2007 Optical Society of America

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