摘要: We have developed a new method of determining in time both the real and imaginary parts third-order nonlinear-optical coefficients. In this phase-conjugated four-wave-mixing signal beam interferes with one transmitted pump beams. By comparing interference pattern that known reference, we are able to determine optical nonlinearity for an unknown sample. The can also be separated when incoming is delayed. apply bis-thienyl polyene molecule containing five conjugate double bonds find hyperpolarizability γ1111 = (−2.5 − 0.17i) × 10−30 esu.
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