НАНОСИСТЕМЫ: ФИЗИКА, ХИМИЯ, МАТЕМАТИКА, 2011, 2 (1), С. 82–90
ВОССТАНОВЛЕНИЕ ВОЛНОВОГО ФРОНТА ПРИ БЕЗОПОРНОЙ ЦИФРОВОЙ ПЗС-РЕГИСТРАЦИИ МУЛЬТИСПЕКТРАЛЬНЫХ СПЕКЛ-КАРТИН
В работе представлен метод восстановления волнового фронта, основанный на использовании набора спекл-картин, сформированных различными длинами волн, и итерационном алгоритме решения уравнения распространения волн в различных плоскостях объема спекл-поля. С помощью численного моделирования восстановлены изображения амплитудных и фазовых объектов и показана возможность расширения данной методики с использованием распределений интенсивностей, записанных в разных плоскостях объема спекл-поля. Экспериментально продемонстрирована возможность восстановления волнового фронта с использованием спекл-картин на трех длинах волн, соответствующих спектральной чувствительности RGB-каналов ПЗС-матрицы, или излучения спектральных компонент суперконтинуума. Первое позволяет записывать три различных распределения интенсивности за одну экспозицию, что дает преимущества при анализе быстропротекающих процессов. Второй вариант подразумевает использование большого количества длин волн, что обеспечивает более быструю и точную сходимость метода, и привлекает простотой и надежностью схемы записи, использующей волоконные оптические элементы.
Ключевые слова: Фазовая проблема, восстановление волнового фронта, спеклы, теория диффракции.
УДК 535.42; 535.417
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