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. (c) 2007 Optical Society of America.
Sapaev, U.k., Assanto, G. (2007). Femtosecond pulse synthesis by efficient second-harmonic generation in engineered quasi phase matching gratings. OPTICS EXPRESS, 15(12), 7448-7457 [10.1364/OE.15.007448].
Femtosecond pulse synthesis by efficient second-harmonic generation in engineered quasi phase matching gratings
ASSANTO, GAETANO
2007-01-01
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. (c) 2007 Optical Society of America.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
