Сравнение фокусировки коротких импульсов в приближении Дебая
Автор: Хонина Светлана Николаевна, Устинов Андрей Владимирович, Волотовский Сергей Геннадьевич
Журнал: Компьютерная оптика @computer-optics
Рубрика: Дифракционная оптика, оптические технологии
Статья в выпуске: 3 т.42, 2018 года.
Бесплатный доступ
Рассмотрены различные типы импульсов и свойства их частотных спектров. Расчёты показали, что существенное различие между импульсами начинается только при очень малых длительностях (менее периода осцилляции). В этом случае импульс Гаусса становится нефизичным и нужно использовать другие типы импульсов, например, импульс Пуассона. Выполнено сравнительное моделирование фокусировки коротких импульсов апланатическим объективом при различных состояниях поляризации и порядках вихревой сингулярности в приближении Дебая. Показано, что для субцикличного импульса Пуассона, имеющего значительную энергию в высоких частотах, состояние поляризации и наличие вихревой фазовой сингулярности существенно влияет на распределение в фокальной области.
Короткие импульсы, частотный спектр, фокусировка импульсов, острая фокусировка, апланатический объектив, приближение дебая
Короткий адрес: https://sciup.org/140228747
IDR: 140228747 | DOI: 10.18287/2412-6179-2018-42-3-432-446
Comparison of focusing of short pulses in the Debye approximation
We have examined different types of pulses and features of their frequency spectra. Calculations have shown that a significant distinction between the pulses only takes place at a very short pulse duration (shorter than the oscillation period). In this case, the Gaussian pulse becomes nonphysical and one needs to use other types of pulses, for example, the Poisson pulse. We performed comparative modeling of focusing of short pulses by an aplanatic lens for different polarization states and vortex singularity orders in the Debye approximation. We have shown that the polarization state and the presence of vortex phase singularity essentially affect the distribution in the focal area for a subcycle Poisson pulse.
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