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Schemes to generate a frequency-domain phase-conjugate pulse by frequency mixing prechirped pulses are proposed. A femtosecond timereversed replica is generated by the temporal-frequency-converted optical parametric processes.

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Shutter ClosesFigure 1: The user perceives a hot sensation as the shutter opens (left) and a cooling sensation as it closes (middle). The system could present thermal sensations without showing the shutter movements using an infrared transmissive mesh screen (right).