Abstract
We use frequency-selective materials to expand the conventional spatial-domain optical processing into the dimensions of frequency and time. Ultrafast performance on the time scale of 10 −13 s is achieved by using resonant media with broad inhomogeneous bandwidth of up to 6 THz, in combination with dipole-allowed resonant transitions such as in organic dye-doped polymers at liquid-helium temperature. We discuss experiments on ultrafast bit-to-bit multiplication by photon echo with spectrally shaped ultrashort pulses. We present an implementation of a coherent logic gate performing “controlled, controlled NOT” operation by time-domain interference of ultrafast photon echo.
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