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Physical Review A

Frequency tuning of the optical delay in cesium D2 line including hyperfine structure

Monte D. Anderson, Glen P. Perram

Published Mar 26, 2010• 4 citations
Publisher

Abstract

The frequency dependence of optical delays in both the wings and core of the cesium $6 {}^{2}{S}_{1/2}\ensuremath{-}6 {}^{2}{P}_{3/2}$ transition have been observed and modeled with a Voigt line shape convolved with the six hyperfine components. Tunable delays of $0\ensuremath{-}37$ ns are achieved by tuning the laser frequency through resonance at various vapor pressures of $0.15\ensuremath{-}5.28$ mTorr.

DOI
10.1103/physreva.81.033842

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The frequency dependence of optical delays in both the wings and core of the cesium 62S1/2\ensuremath−62P3/26 {}^{2}{S}_{1/2}\ensuremath{-}6 {}^{2}{P}_{3/2}62S1/2​\ensuremath−62P3/2​ transition have been observed and modeled with a Voigt line shape convolved with the six hyperfine components. Tunable delays of 0\ensuremath−370\ensuremath{-}370\ensuremath−37 ns are achieved by tuning the laser frequency through resonance at various vapor pressures of 0.15\ensuremath−5.280.15\ensuremath{-}5.280.15\ensuremath−5.28 mTorr.
We report on a tunable all-optical delay line for pulses with optical frequency within the Rb D2 absorption line. Using frequency tuning between absorption components from different isotopes, pulses of 10 ns duration are delayed in a 10 cm hot vapour cell by up to 40 ns while the transmission remains above 10%. The use of two isotopes allows the delay to be increased or decreased by optical pumping with a second laser, producing rapid tuning over a range of more than 40% of the initial delay at 110°C. We investigate the frequency and intensity ranges in which this delay line can be realized. Our observations are in good agreement with a numerical model of the system.
Optically tunable pulse delays in cesium vapor were demonstrated by pumping several D2 transitions and burning holes in the D1 absorption spectrum. A modified sub-Doppler absorption spectroscopy setup was used with counter propagating beams with a Gaussian 7-ns full-width at half-maximum probe pulse is scanned across the D1 absorption spectrum. Probe laser optical delays followed Kramers-Kronig model prediction for Cs D1 without D2 pump laser. Optical control of pulse delay was demonstrated by varying pump intensity. Localized delay effects in agreement with model predictions were observed in the neighborhood of a burnt hole.
We report on a tunable all-optical delay line for pulses with optical frequency within the Rb D 2 absorption line. Using frequency tuning between absorption components from different isotopes, pulses of 10 ns duration are delayed in a 10 cm hot vapour cell by up to 40 ns while the transmission remains above 10%. The use of two isotopes allows the delay to be increased or decreased by optical pumping with a second laser, producing rapid tuning over a range of more than 40% of the initial delay at 110 °C. We investigate the frequency and intensity ranges in which this delay line can be realized. Our observations are in good agreement with a numerical model of the system.