Femtosecond pulse synthesis by efficient second-harmonic generation in engineered quasi phase matching gratings
У. К. СапаевNonlinear Optics and OptoElectronics Lab, INFN & CNISM, University Roma Tre Via della Vasca Navale 84, 00146, Rome-ItalyGaetano AssantoNonlinear Optics and OptoElectronics Lab, INFN & CNISM, University Roma Tre Via della Vasca Navale 84, 00146, Rome-Italy
2007en
ABI
Abstract
We numerically design quasi-phase matched crystals with domains of arbitrary sizes for second harmonic generation by femtosecond pulses, taking into account both group velocity mismatch and dispersion. An efficient simulated-annealing algorithm is developed to design quasi-phase matching gratings which can yield the desired amplitude and phase of second-harmonic pulses in the presence of pump depletion. The method is illustrated with reference to single, double-hump and chirped fs Gaussian pulses in a lithium niobate crystal.
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