Тип публикации: статья из журнала
Год издания: 2018
Идентификатор DOI: 10.1088/1612-202X/aaa618
Ключевые слова: nonlinear Bragg diffraction, nonlinear photonic lattice, second harmonic generation, femtosecond pulses
Аннотация: The frequency doubling of femtosecond laser pulses in a two-dimensional (2D) rectangular nonlinear photonic lattice with hexagonal domains is studied experimentally and theoretically. The broad fundamental spectrum enables frequency conversion under nonlinear Bragg diffraction for a series of transverse orders at a fixed longitudinПоказать полностьюal quasi-phase-matching order. The consistent nonstationary theory of the frequency doubling of femtosecond laser pulses is developed using the representation based on the reciprocal lattice of the structure. The calculated spatial distribution of the second-harmonic spectral intensity agrees well with the experimental data. The condition for multiple nonlinear Bragg diffraction in a 2D nonlinear photonic lattice is offered. The hexagonal shape of the domains contributes to multibeam second harmonic excitation. The maximum conversion efficiency for a series of transverse orders in the range 0.01%-0.03% is obtained.
Журнал: LASER PHYSICS LETTERS
Выпуск журнала: Vol. 15, Is. 4
Номера страниц: 45401
ISSN журнала: 16122011
Место издания: BRISTOL
Издатель: IOP PUBLISHING LTD