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IEEE Journal of Quantum Electronics

Optical pulse squaring effects in a dispersive delay line

Robert H. Lehmberg, John F. Reintjes, Robert C Eckardt

Published Sep 1, 1977• 0 citations
Publisher

Abstract

Abstract : Temporal squaring effects are produced using a pair of diffraction gratings on 30 psecduration 1.06 micrometer pulses that were negatively self phase modulated in cesium vapor. The results are in good agreement with the theory, which is discussed in detail. Further enhancement of the squaring by a saturable absorber is also discussed.

DOI
10.1109/jqe.1977.1069541

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Abstract : Temporal squaring effects are produced using a pair of diffraction gratings on 30 psecduration 1.06 micrometer pulses that were negatively self phase modulated in cesium vapor. The results are in good agreement with the theory, which is discussed in detail. Further enhancement of the squaring by a saturable absorber is also discussed.
We analyze and experimentally demonstrate a new (temporal) Talbot effect, where a pulsed phase grating is applied to a cloud of cold atoms (Bose-Einstein condensate). In contrast to the usual (spatial) Talbot effect, our atoms gain kinetic energy when diffracted by the pulsed grating. The energy gain and the matter-wave-dispersion relation result in an exact (no paraxial approximation) Talbot effect where the initial wave front is reconstructed at multiples of a ``Talbot time'' TT{T}_{\mathrm{T}}TT​. We demonstrate the Talbot effect by applying a second pulsed phase grating after a variable delay. When this second grating is applied at even (odd) multiples of TT/2{T}_{\mathrm{T}}/2TT​/2, it doubles (cancels) the effect of the first pulsed grating.
Propagation of optical pulses in a resonantly absorbing medium is studied. Propagation time of nanosecond pulses was measured for the Rb D1{D}_{1}D1​ transition. At the center of two absorption lines, delay of the pulse peak which is about ten times as large as the pulse width was observed, where zero delay is defined for the propagation with the light velocity in vacuum. On the other hand, at the peak of an absorption line, negative delay was observed for large absorption, where the advance time is as large as 25% of the pulse width. Simulation including the effect of absorption and phase shift reproduced well the experimental results.