Picosecond Phase Conjugation By Degenerate Four Wave Mixing In Alkali Vapours - A Method For Measuring Perturbation Times Of The Atomic Wavefunctions

A. C. Cefalas; S. Spyrou; C. A. Nicolaides

doi:10.1117/12.950567

20 June 1989 Picosecond Phase Conjugation By Degenerate Four Wave Mixing In Alkali Vapours - A Method For Measuring Perturbation Times Of The Atomic Wavefunctions

A. C. Cefalas, S. Spyrou, C. A. Nicolaides

Author Affiliations +

Proceedings Volume 1031, 7th Intl Symp on Gas Flow and Chemical Lasers; (1989) https://doi.org/10.1117/12.950567
Event: 7th International Symposium on Gas Flow and Chemical Lasers, 1988, Vienna, Austria

Abstract

Phase conjugated waves via degenerate four wave mixing with picosecond laser pulses having a full width at half maximum (FWHM) of 80 ps have been observed in alcali vapours. The dephasing time of the 2P3/2 state in sodium was found to be 7.4 ns. This is the lifetime of the transient volume grating of the atomic states which are involved in the phase conjugated experiment. The average time of the perturbation of the atomic wave functions due to a "hot" collision (from a frequency modulation of a Markov type) was found to be 5x10-14 sec.

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A. C. Cefalas, S. Spyrou, and C. A. Nicolaides "Picosecond Phase Conjugation By Degenerate Four Wave Mixing In Alkali Vapours - A Method For Measuring Perturbation Times Of The Atomic Wavefunctions", Proc. SPIE 1031, 7th Intl Symp on Gas Flow and Chemical Lasers, (20 June 1989); https://doi.org/10.1117/12.950567

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