Тип публикации: статья из журнала
Год издания: 2014
Идентификатор DOI: 10.1364/OL.39.004231
Ключевые слова: Ultrashort pulses, Group-velocity mismatch, Nonlinear diffraction, Nonlinear photonics, Propagation angle, Raman-Nath diffraction, Second harmonic pulse, Second harmonics, Spectral intensity, Diffraction
Аннотация: We study the nonlinear Raman-Nath diffraction (NRND) of femtosecond laser pulses in a 1D periodic nonlinear photonic structure. The calculated second-harmonic spectra represent frequency combs for different orders of transverse phase matching. These frequency combs are in close analogy with the well-known spectral Maker fringes obsПоказать полностьюerved in single crystals. The spectral intensity of the second harmonic experiences a redshift with a propagation angle, which is opposite the case of Cerenkov nonlinear diffraction. We analyze how NRND is affected by the group-velocity mismatch between fundamental and second-harmonic pulses and by the parameters of the structure. Our experimental results prove the theoretical predictions. (C) 2014 Optical Society of America
Журнал: OPTICS LETTERS
Выпуск журнала: Vol. 39, Is. 14
Номера страниц: 4231-4234
ISSN журнала: 01469592
Место издания: WASHINGTON
Издатель: OPTICAL SOC AMER