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Journal of Modern Optics

Energy transfer induced by femtosecond two-beam coupling in two Kerr liquids

Changwei Li, Xueru Zhang, Qing Ming Chang, Degui Kong, Hongan Ye, Junyi Yang, Xiao Jin, Min Shui, Yuxiao Wang, Kun Yang, Yinglin Song

Published Dec 1, 2009• 0 citations
Publisher

Abstract

Femtosecond two-beam coupling is demonstrated in N,N′-dimethylformamide and dimethyl sulfoxide by using a time-resolved pump-probe system at a wavelength of 800 nm. As the temporal delay between pulses is varied within the coherence time, transient energy transfer from one pulse to another occurs. Because of the asymmetry of the normalized transmittance, two-photon absorption is considered in the two liquids. A theory based on two-beam coupling in perpendicular linear polarization is used to interpret the experimental results. Good agreement is obtained between the theory and experiment. Moreover, by introducing a valuable variable, the ratio of the relaxation times of the two Kerr liquids is directly characterized.

DOI
10.1080/09500340903450290

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We have observed transient, coherent beam combination by degenerate two-wave mixing of frequency-doubled Nd:YAG picosecond laser pulses in carbon disulfide, using a circularly polarized pump wave and a linearly polarized probe beam. The important role of beam polarization is observed, and its part in energy transfer is discussed. A theory that treats polarization effects in transient two-wave mixing is presented, applied to the carbon disulfide experiments, and found to be in excellent agreement with the data.
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