Pulse Compression by Difference-Frequency Generation with Engineered Aperiodic Optical Superlattic
نویسندگان
چکیده
We theoretically propose a procedure for designing quasi-phase-matching (QPM) gratings for compressing ultrashort optical pulses during difference-frequency generation. The grating consists of blocks of crystal with the same block length and the direction of spontaneous polarization of each block is determined by an optimal algorithm through which the sign of the nonlinear coefficient of each block is optimized to make the phase response of the grating the same for different wavelengths of the output idler waves so that the generated idler pulse from the end of the crystal will be compressed during difference-frequency generation. Pumped by a cw (or a quasi-cw) laser, the generated idler pulse is compressed beyond its Fourier-transform limit in the simulations.
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