We observe two-photon absorption (2PA) of picosecond, 0.6-μm, 0.3-nJ pulses in a 0.4-μm film of ZnSe. We use high-frequency-modulation phase-sensitive detection to be near the shot-noise limit combined with a low-frequency pulse-delay modulation to discriminate against large thermal nohlinearities. This dual-modulation technique, combined with the field enhancement produced by placing the film in a resonant cavity, permits observation of 2PA and other fast nonlinearities by using pulses having peak powers of the order of 1 W.
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Stryland et al. (1988) studied this question.
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