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Laser tunable Toraldo superresolution with a uniform nonlinear pupil filter

机译:具有均匀非线性光瞳滤波器的激光可调式Toraldo超分辨率

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摘要

We demonstrate that it is possible to reduce the focal spot size by inserting a uniform nonlinear thin film at the aperture of a focusing lens. The reduction of spot size is tunable by adjusting the incoming laser power. In comparison with the original diffraction spot, the transverse spot size can be reduced 0.65 times. The nonlinear thin film acts effectively as a Toraldo filter, and the phase and amplitude modulation stems from the laser-induced variances in the transmission of the thin film. The proposed technique removes the need of fabricating annular pupil filters.
机译:我们证明有可能通过在聚焦透镜的孔径处插入均匀的非线性薄膜来减小焦斑大小。光斑尺寸的减小可通过调节入射激光功率来调节。与原始衍射光斑相比,横向光斑尺寸可减小0.65倍。非线性薄膜有效地用作Toraldo滤波器,并且相位和幅度调制源于激光在薄膜透射中引起的变化。所提出的技术消除了制造环形光瞳滤波器的需要。

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