Инд. авторы:	Zhukov V.P., Bulgakova N.M.
Заглавие:	Asymmetry of light absorption upon propagation of focused femtosecond laser pulses with spatiotemporal coupling through glass materials
Библ. ссылка:	Zhukov V.P., Bulgakova N.M. Asymmetry of light absorption upon propagation of focused femtosecond laser pulses with spatiotemporal coupling through glass materials // Proceedings of SPIE - The International Society for Optical Engineering. - 2017. - Vol.10228. - Art.UNSP 102280D. - ISSN 0277-786X.
Внешние системы:	DOI: 10.1117/12.2265399; РИНЦ: 31035826; SCOPUS: 2-s2.0-85029148278; WoS: 000407115600008;
Реферат:	eng: Ultrashort laser pulses are usually described in terms of temporal and spatial dependences of their electric field, assuming that the spatial dependence is separable from time dependence. However, in most situations this assumption is incorrect as generation of ultrashort pulses and their manipulation lead to couplings between spatial and temporal coordinates resulting in various effects such as pulse front tilt and spatial chirp. One of the most intriguing spatiotemporal coupling effects is the so-called 'lighthouse effect', the phase front rotation with the beam propagation distance [Akturk et al., Opt. Express 13, 8642 (2005)]. The interaction of spatiotemporally coupled laser pulses with transparent materials have interesting peculiarities, such as the effect of nonreciprocal writing, which can be used to facilitate microfabrication of photonic structures inside optical glasses. In this work, we make an attempt to numerically investigate the influence of the pulse front tilt and the lighthouse effect on the absorption of laser energy inside fused silica glass. The model, which is based on nonlinear Maxwell's equations supplemented by the hydrodynamic equations for free electron plasma, is applied. As three-dimensional solution of such a problem would require huge computational resources, a simplified two-dimensional model has been proposed. It has enabled to gain a qualitative insight into the features of propagation of ultrashort laser pulses with the tilted front in the regimes of volumetric laser modification of transparent materials, including directional asymmetry upon direct laser writing in glass materials. © 2017 SPIE.
Ключевые слова:	Ultrashort pulses; Three-dimensional solutions; Spatiotemporal coupling; Pulse-front tilt; Nonlinear materials; Gaussian lasers; Free electron; Focused femtosecond lasers; Computational resources; Ultrafast lasers; Optical glass; Nonlinear optics; Nonlinear equations; Maxwell equations; Lighthouses; Light propagation; Light absorption; Laser beams; Glass; Gaussian beams; Fused silica; Electrons; Electromagnetic wave propagation in plasma; Electromagnetic wave absorption; Electric fields; pulse front tilt; non-linear materials; Maxwell's equations; lighthouse effect; Laser beam propagation; glass; Gaussian laser pulses; free electron plasma; Laser pulses;
Издано:	2017
Конференция:	Название: 7th Nonlinear Optics and Applications Conference Город: Prague Страна: Czech Republic Даты проведения: 2017-04-24 - 2017-04-27
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