NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2015, 6 (2), P. 244–248
Femtosecond pulse shaping via engineered nonlinear photonic crystals
U. K. Sapaev – Department of Physics, National University of Uzbekistan, named after M. Ulugbek, Tashkent, Uzbekistan; usapaev@gmail.com
V. E. Eshniyazov – Department of Physics, National University of Uzbekistan, named after M. Ulugbek, Tashkent, Uzbekistan
B. Kh. Eshchanov – Department of Physics, National University of Uzbekistan, named after M. Ulugbek, Tashkent, Uzbekistan
D. B. Yusupov – Tashkent State Technical University, Tashkent, Uzbekistan
Non-stationary second harmonic generation by femtosecond pulses, taking into account both group velocity mismatch and dispersion in nonlinear photonic crystals (quasi-phase matched crystals) with domains of arbitrary sizes has been studied numerically. A simulated-annealing algorithm, working on the basis of numerical calculation, is developed to design quasi-phase matching gratings which can yield the desired amplitude and phase profile for second-harmonic pulses in the presence of pump depletion.
Keywords: second harmonic generation, quasi-phase matched crystals, nonlinear photonic crystals, pulse shaping.
PACS 42.65.-ky, 42.79.Nv
DOI 10.17586/2220-8054-2015-6-2-244-248
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