Coherent radiation in time separated fields
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This paper reports on an experimental observation of coherent radiation after interaction with two standing-wave pulses having the time delayT in an absorbing rarefied gas. The radiation appears at the time 2T, 3T,... after the first pulse. The coherent radiation arises due to spacial transfer of polarization and to formation of a spacial polarization harmonic owing to a phase jump after two-photon interaction with the field of the second pulse. We observed intensity oscillations with frequency tuning of the exciting laser, varying the time delay between pulses.
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