Abstract
A completely symmetrical scheme of a shaper of cylindrical vector beams is proposed in which two diffractive axicons and an interference polarizer placed in-between form a sandwich structure of the smallest possible thickness. The design and experimental study of an interference polarizer for generating the radially polarized radiation at a 1530-nm wavelength is carried out. A pair of amplitude diffractive axicons with a period of 3.62 μm to provide the diffraction angle of 24.5° required for generating radial polarization is fabricated. The transformation of a circularly polarized beam into a radially polarized vortex beam is experimentally demonstrated.
Highlights
A completely symmetrical scheme of a shaper of cylindrical vector beams is proposed in which two diffractive axicons and an interference polarizer placed in-between form a sandwich structure of the smallest possible thickness
A pair of amplitude diffractive axicons with a period of 3.62 μm to provide the diffraction angle of 24.5 ° required for generating radial polarization is fabricated
5. Tovar, A.A. Production and propagation of cylindrically polarized Laguerre–Gaussian laser beams / A.A. Tovar // Journal of the Optical Society of America A
Summary
Проведён расчёт и экспериментальное исследование интерференционного поляризатора для формирования радиально-поляризованного излучения на длине волны 1530 нм. Толщина формирователя уменьшается до минимально возможной, а увеличение длины волны до 1,53 мкм при сохранении рабочего угла поляризатора позволяет почти в 3 раза увеличить период аксикона по сравнению с [8, 12, 13]. Интерференционный поляризатор представляет собой нанесённое на подложку многослойное оптическое покрытие, спектральное пропускание которого отличается для p- и s-поляризованного излучения при ненулевых углах падения. При этом можно подобрать такие толщины слоёв и угол падения, что в окрестности заданной длины волны λ0 будет наблюдаться максимальное пропускание для p-поляризации и минимальное для s-поляризации.
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