A novel technique for continuously programming an optical coherent transient spatial–spectral signal processor is proposed. The repeated application of two spatially distinct optical programming pulses to a nonpersistent hole-burning material writes an accumulated spatial–spectral population grating. An optical data stream is introduced on a third beam, resulting in a processor output signal that is spatially distinct from all the input pulses. Programming and processing take place simultaneously, asynchronously, and continuously. In the case of true-time delays, the efficiency that is achievable with currently available materials is of the order of that predicted for a perfect photon-gated device.
© 1999 Optical Society of America
(030.0030) Coherence and statistical optics : Coherence and statistical optics
(050.2770) Diffraction and gratings : Gratings
(070.6020) Fourier optics and signal processing : Continuous optical signal processing
(090.0090) Holography : Holography
K. D. Merkel and W. R. Babbitt, "Optical coherent transient continuously programmed continuous processor," Opt. Lett. 24, 172-174 (1999)