The generation of a femptosecond second harmonic in a bacterior-hodopsin solution is investigated. It is shown that the behavior of the harmonic can be explained by the coherent interference of several contributions from three-and five-wave mixing processes ( χ (2) and χ (4) ). The magnitude and phase of the fourth-order electronic susceptibility χ (4) of the medium with respect to χ (2) are determined.
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Balakin et al. (1996) studied this question.
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