A complex spectral grating is accumulated by repeated application of a pair of low-power optical programming pulses to a short-term persistent inhomogeneously broadened transition in Tm:YAG at 4.5 K and then probed to investigate the buildup dynamics. The necessary frequency stability is obtained by locking a cw Ti:sapphire laser to a regenerating transient spectral hole in the same transition. Grating accumulation is demonstrated for both a periodic spectral grating, representing a true-time delay, and a complex spectral grating, permitting correlation-based pattern recognition. This work is a step toward demonstrating an optical coherent transient continuously programmed continuous processor.
© 2000 Optical Society of America
(070.4340) Fourier optics and signal processing : Nonlinear optical signal processing
(070.4550) Fourier optics and signal processing : Correlators
(070.4560) Fourier optics and signal processing : Data processing by optical means
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(210.0210) Optical data storage : Optical data storage
K. D. Merkel, R. D. Peters, P. B. Sellin, K. S. Repasky, and W. R. Babbitt, "Accumulated programming of a complex spectral grating," Opt. Lett. 25, 1627-1629 (2000)