Тип публикации: статья из журнала
Год издания: 2016
Идентификатор DOI: 10.1364/JOSAB.33.002308
Ключевые слова: Band structure, Frequency doublers, Gaussian beams, Nonlinear optics, Phase matching, Analytical expressions, Frequency-doubling, Interaction geometries, Intersection angles, Parametric interactions, Phase matching conditions, Spectral bandwidth, Transform-limited pulse, Harmonic generation
Аннотация: Noncollinear second-harmonic generation from two ultrashort pulses intersecting in a nonlinear medium is studied in spectral and time domains. We derive analytical expressions for the second-harmonic (SH) amplitude in crystals of finite thickness neglecting diffraction. The contribution from characteristics of the fundamental radiaПоказать полностьюtion and interaction geometry to the process is analyzed. In addition, refined phase-matching conditions are obtained. We find that the spectral bandwidth is determined by the intersection angle and can be enlarged. The SH pulse duration can be optimized by varying the fundamental beam size and the intersection angle. It is found that the SH beam excited by a Gaussian fundamental beam becomes elliptical. It is shown that the fundamental pulse duration can be readily characterized with single pulses by means of measuring the ellipticity of the SH beam profile. The approach developed can potentially be used to calculate parametric interactions of fundamental pulses with an arbitrary spectrum. (C) 2016 Optical Society of America
Журнал: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Выпуск журнала: Vol. 33, Is. 11
Номера страниц: 2308-2312
ISSN журнала: 07403224
Место издания: WASHINGTON
Издатель: OPTICAL SOC AMER