Diffractive tunable lens for remote focusing in high-NA optical systems

被引:14
|
作者
Bawart, Martin [1 ]
May, Molly A. [1 ]
Oettl, Thomas [1 ]
Roider, Clemens [2 ]
Bernet, Stefan [1 ]
Schmidt, Michael [2 ,3 ]
Ritsch-Marte, Monika [1 ]
Jesacher, Alexander [1 ,3 ]
机构
[1] Med Univ Innsbruck, Inst Biomed Phys, Mullerstr 44, A-6020 Innsbruck, Austria
[2] Friedrich Alexander Univ Erlangen Nurnberg, Inst Photon Technol, Konrad Zuse Str 3-5, D-91052 Erlangen, Germany
[3] Friedrich Alexander Univ Erlangen Nurnberg, Grad Sch Adv Opt Technol SAOT, Paul Gordan Str 6, D-91052 Erlangen, Germany
基金
奥地利科学基金会;
关键词
ACOUSTOOPTIC LENS;
D O I
10.1364/OE.400784
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Remote ibcusing means to translate the focus position of an imaging system along the optical axis without moving the objective lens. The concept gains increasing importance as it allows for quick 3D focus steering in scanning microscopes, leaves the sample region unperturbed and is compatible with conjugated adaptive optics. Here we present a novel remote focusing approach that can be used in conjunction with high numerical aperture optics. Our method is based on a pair of diffractive elements, which jointly act as a tunable auxiliary lens. By changing the mutual rotation angle between the two elements, we demonstrate an axial translation of the focal spot produced by a NA = 0.95 air objective (corresponding to NA = 1.44 for an oil immersion lens) over more than 140 mu m with largely maintained focus quality. We experimentally show that for the task of focus shifting, the wavefront produced by the high-NA design is superior to those produced by a parabolic lens design or a regular achromatic lens doublet. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License.
引用
收藏
页码:26336 / 26347
页数:12
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    Bawart, Martin
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