Coherent Transient Systems Evaluation
William Randall Babbitt
This final report of contract F49620-91-C-0088 describes the development of the analytical tools required to evaluate optical coherent transient memory, triple-product correlator, and continuous signal processor systems. One key tool is a coherent transient simulator based on the optical Bloch equations. The coherent transient output signal that results from an arbitrary sequence of pulses, each having an arbitrary amplitude, duration, center frequency, chirp, phase, and timing can be calculated. The simulator was used to study excitation pulse saturation and it effects on the output signal efficiency and fidelity and to study frequency chirped reference pulse saturation. Analytical tools were developed to assess the effects of local heating and spatial crosstalk. A performance evaluation of a coherent transient continuous optical correlator is reported, along with new implementation techniques. The continuous processor's predicted time-bandwidth product, data bandwidth, and pattern storage density are 10000, 5 GHz, and 100000 patterns per square centimeter, respectively. A proof of concept demonstration of the continuous optical processor was performed in europium doped yttrium silicate in collaboration with IBM Almaden Research Center. Research into divalent ion doped crystals as photon gated materials for coherent transient systems was performed.
Final Report•Jun 17, 1993•0 citations