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Frontiers in Optics

Large group delays and long storage times for optical pulses in atomic vapor cells

Irina V. Novikova, D. F. Phillips, Ronald Lee Walsworth

Published Jan 1, 2006• 0 citations
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Abstract

We achieve large fractional delays in slow and stored light in atomic vapors using temporally shaped control fields. Combined with amplification, temporal control allows for pulse transmission with pulse bandwidth preservation and minimal distortion.
DOI
10.1364/ls.2006.ltuj1

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Conclusions • Control and signal fields have orthogonal linear polarizations. • Two AOMs allow independent control of Probe and Control field intensities. • PZT allows adjustment of phase difference, , between control and probe fields. • Use gain and pulse recompression to localize pulse in medium • Turn off control field to store pulse as atomic coherence. • After storage interval, retrieve using constant control field. Fractional delay > 20

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We study ultrabroadband slow light in a warm rubidium vapor cell. By working between the D1 and D2 transitions, we find a several-nanometer window centered at 788.4 nm in which the group index is highly uniform and the absorption is small (<1%). We demonstrate that we can control the group delay by varying the temperature of the cell, and we observe a tunable fractional delay of 18 for pulses as short as 250 fs (6.9 nm bandwidth) with a fractional broadening of only 0.65 and a power leakage of 55%. We find that a simple theoretical model is in excellent agreement with the experimental results. Using this model, we discuss the impact of the pulse’s spectral characteristics on the distortion it incurs during propagation through the vapor.