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Optics Communications

Two-wave mixing with cross-polarized beams in sodium: a quantitative investigation

Marc Vallet, M. Pinard, G. Grynberg

Published Feb 1, 1992• 9 citations
Publisher
DOI
10.1016/0030-4018(92)90481-6

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The interaction of two linearly cross-polarized beams having frequencies ${\mathrm{\ensuremath{\omega}}}_{1}$ and ${\mathrm{\ensuremath{\omega}}}_{2}$ with sodium atoms leads to the generation of new waves having frequencies (2p+1)${\mathrm{\ensuremath{\omega}}}_{1}$-2p${\mathrm{\ensuremath{\omega}}}_{2}$. The intensities of these waves are well explained by a simple model based on self-induced optical activity. The relation with the atomic cooling in a polarization gradient and with the exact resonances in multiwave mixing is pointed out.

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Phase-modulation-induced two-wave mixing in semiconductors

Robert Frey, J. Frey, Christos Flytzanis

Two-wave mixing amplification of a weak probe beam interfering with a powerful pump beam of the same linear polarization is demonstrated when the probe beam enters the semiconductor sample before the pump pulse. This mixing of two beams of the same frequency is made possible by the difference between self-phase modulation and cross-phase modulation, which modify differently the instantaneous frequencies of both beams. Net gain coefficients up to 5.5 cm (-1) are obtained for experiments performed in CdTe. Theoretical calculations quantitatively confirm this interpretation and predict much higher gain for more resonant configurations or higher pump energies, making this process of potential interest for optical processing.

Optics Letters•Feb 15, 1997•1 citation
The interaction of two linearly cross-polarized beams having frequencies ${\mathrm{\ensuremath{\omega}}}_{1}$ and ${\mathrm{\ensuremath{\omega}}}_{2}$ with sodium atoms leads to the generation of new waves having frequencies (2p+1)${\mathrm{\ensuremath{\omega}}}_{1}$-2p${\mathrm{\ensuremath{\omega}}}_{2}$. The intensities of these waves are well explained by a simple model based on self-induced optical activity. The relation with the atomic cooling in a polarization gradient and with the exact resonances in multiwave mixing is pointed out.
Two-wave mixing amplification of a weak probe beam interfering with a powerful pump beam of the same linear polarization is demonstrated when the probe beam enters the semiconductor sample before the pump pulse. This mixing of two beams of the same frequency is made possible by the difference between self-phase modulation and cross-phase modulation, which modify differently the instantaneous frequencies of both beams. Net gain coefficients up to 5.5 cm (-1) are obtained for experiments performed in CdTe. Theoretical calculations quantitatively confirm this interpretation and predict much higher gain for more resonant configurations or higher pump energies, making this process of potential interest for optical processing.