Цифровой анализ спекл картины хаотичной композиции мод и восстановление регулярного узора интенсивности после многомодового волокна
Автор: Воляр Александр Владимирович, Брецько Михаил Владимирович, Акимова Яна Евгеньевна, Егоров Юрий Александрович
Журнал: Компьютерная оптика @computer-optics
Рубрика: Дифракционная оптика, оптические технологии
Статья в выпуске: 2 т.45, 2021 года.
Бесплатный доступ
Экспериментально и теоретически исследовался процесс согласования мод в хаотической спекл картине без опорного пучка, ответственного за формирование голографической решетки. Наш подход основывается на измерении амплитуд и фаз мод Эрмита-Гаусса и Лагерра-Гаусса в спекл картине, образованной излучением многомодового градиентного волокна. Cпекл картина формировалась на голограмме пространственного модулятора света, используя модель многомодового градиентного волокна с учетом модовой и поляризационной дисперсии, а также случайных скачков фазы каждой собственной моды. Нам удалось согласовать 210 мод спекл картины и восстановить не только исходный узор, то также каждую структурированную моду Лагерра-Гаусса и всю цепочку собственных мод Эрмита-Гаусса.
Оптические вихри, структурированный сингулярный пучок, спекл картина
Короткий адрес: https://sciup.org/140257374
IDR: 140257374 | DOI: 10.18287/2412-6179-CO-831
Digital analysis of a speckle pattern of chaotic mode composition and restoration of a regular intensity pattern after a multimode fiber
A process of mode matching in a chaotic speckle pattern without a reference beam responsible for the formation of a holographic grating was studied experimentally and theoretically. Our approach was based on measuring the amplitudes and phases of the Hermite-Gauss (HG) and Laguerre-Gauss (LG) modes in a speckle pattern formed by the radiation of a multimode gradient fiber. The speckle pattern was formed in a hologram of a spatial light modulator using a multimode gradient fiber model while taking into account the mode and polarization dispersion, as well as random phase jumps of each eigenmode. We managed to match 210 modes of the speckle pattern and restore not only the original pattern, but also each structured LG mode and the entire chain of HG eigenmodes.
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