A phase-conjugate wave A exp(−iϕ) exp[i(ky − ωt)] was generated in the forward direction in physically thin Na-vapor cells by a pump wave and a signal wave A exp(iϕ) with either pulsed or continuous laser radiation near the Na D line. High-order nonlinearities were readily observed with pulsed radiation, and waves with phase exp(Im ϕ) were observed up to m = ±8.
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Heer et al. (1979) studied this question.
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