Ultra-sensitive all-optical sampling at 1.5 µm using two-photon-absorption in a commercial 1.3 µm quantum-well semiconductor laser has been demonstrated. Using only direct detection of the unamplified two photon absorption photocurrent, a temporal resolution of ~2 ps and a sensitivity of less than 2 mW2 have been achieved.
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Thomsen et al. (1999) studied this question.