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Achromatization of conical diffraction: application to the generation of a polychromatic optical vortex

机译:锥形衍射消色差:在产生多色光学涡旋中的应用

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摘要

Vortex beams are plagued by the intrinsic chromaticity of the physical phenomenon used to generate them. To the authors' best knowledge, attempts to generate them in a broad spectral range remain quite scarce and limited in their results. Crystal optics and especially conical diffraction (CD) (or refraction) intrinsically create achromatic vortices. The vortex is created by a wavelength-independent topological charge, embedded directly in the Fresnel equations. However, for biaxial crystals of low crystallographic symmetry, which includes all crystals used practically for CD, the dispersion of the binormal axis creates a chromaticity effect. In this Letter, we propose a new way to compensate this dispersion of the binormal axis of a biaxial crystal in order to generate white-light vortex beams by CD in a 250 nm spectral range, covering almost all the visible range. The advantages of the ability to use CD in a wide spectral range vastly exceed the sole generation of vortex beams. (C) 2016 Optical Society of America
机译:涡旋光束受到用于产生它们的物理现象的固有色度的困扰。据作者所知,尝试在较宽的光谱范围内生成它们仍然很稀少,而且结果有限。晶体光学,尤其是锥形衍射(CD)(或折射)本质上会产生消色差涡旋。涡旋由与波长无关的拓扑电荷产生,直接嵌入菲涅尔方程。但是,对于低结晶对称性的双轴晶体,其中包括实际上用于CD的所有晶体,双法向轴的分散会产生色度效应。在这封信中,我们提出了一种补偿双轴晶体双法向轴色散的新方法,以便通过CD在250 nm光谱范围内产生几乎覆盖所有可见范围的白光涡旋光束。在宽光谱范围内使用CD的优势大大超过了唯一的涡旋光束。 (C)2016美国眼镜学会

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