Design of achromatic annular folded lens with multilayer diffractive optics for the visible and near-IR wavebands.
Mingxu Piao,Bo Zhang,Keyan Dong +2 more
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TL;DR: A new design method of the MLDOE is proposed to improve the polychromatic integral diffraction efficiency (PIDE) that makes it suitable for the optical path of the AFL and can provide a new idea for designing a broadband, miniaturized, and low-cost imaging system.
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Abstract: In this paper, the annular folded lens (AFL) is applied to the realization of a miniaturized system for the visible and near-IR spectrums (0.45-1.1μm). In order to correct the chromatic aberration, a hybrid AFL is designed with the multilayer diffractive optical element (MLDOE) in which the substrate materials are precision molded glasses. We propose a new design method of the MLDOE to improve the polychromatic integral diffraction efficiency (PIDE) that makes it suitable for the optical path of the AFL. By comparing the characteristic angle weighted PIDE (CAW-PIDE), the optimal microstructure heights of the MLDOE can be obtained, and the effect of diffraction efficiency on image quality can be minimized for the entire incident angle range. The design results show that the ratio of total length to the focal length is only 0.332, and comprehensive modulation transfer function considering the diffraction efficiency is larger than 0.26 at 166 lp/mm. This study can provide a new idea for designing a broadband, miniaturized, and low-cost imaging system.
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Citations
Polychromatic annular folded lenses using freeform gradient-index optics
David H. Lippman,Robert Y. Chou,Ankur X. Desai,Nicholas S. Kochan,Tianyi Yang,Greg R. Schmidt,Julie Bentley,Duncan T. Moore +7 more
TL;DR: In this article, a freeform gradient-index (F-GRIN) media is introduced to the annular folded lens (AFL) to achieve higher monochromatic performance as well as provide color correction for diffraction limited polychromatic imaging.
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Optical design of monolithic compressed folding imaging lens for infrared/laser dual-band
Abstract: In order to realize the miniaturization of the dual-band system, the monolithic compressed folding imaging lens (CFIL) is designed for infrared/laser dual-band in this paper. The relationship among the back focal length, field of view, pupil diameter, and central obscuration of the CFIL are derived. The design method of the dual-band CFIL is given, and the stray light of the CFIL can be suppressed by the double-layer hood structure. According to the design method of the CFIL, the infrared/laser dual-band can be applied by a monolithic optical element. The design results show that the minimum MTF for all fields of view in the infrared band is greater than 0.125 at 42lp/mm, the spot uniformity in the laser band is greater than 90%, and the total system length is only 0.305 times the focal length. After tolerance analysis, the MTF of CFIL is greater than 0.1, and the spot diagram is less than 880µm. The working temperature of the system is -20∼50°C, and the compensation distance is given. After stray light optimization, The point source transmittance (PST) value in the infrared band is reduced by 2 to 4 orders of magnitude, and the PST value in the laser band is reduced by 1 to 5 orders of magnitude. Compared with the traditional coaxial reflective system, the infrared/laser dual-band CFIL has only one lens, and the optical structure is compact. It provides a new idea for the integration and miniaturization of the multi-band system.
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Design and tolerance analysis of a large-diameter diffractive telescope
TL;DR: In this paper , a large-diameter sub-aperture stitching diffractive telescope with a long focal length of 2000 mm and a full field of view (FOV) of 0.34° was designed.
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Imaging stretching and displacement using gradient-index elements during the lens design process.
TL;DR: In this article , an approach to stretch or translate images using gradient-index (GRIN) elements with a rotationally symmetric shape in lens systems is proposed, where the GRIN material, instead of optical surfaces, is utilized to enable a breaking of rotational symmetry for the two image translations.
References
Effects of diffraction efficiency on the modulation transfer function of diffractive lenses
TL;DR: The integrated efficiency is shown to be the limiting value for the optical transfer function; in most cases it serves as an overall scale factor for the transfer function.
Design of multilayer diffractive optical elements with polychromatic integral diffraction efficiency.
Changxi Xue,Qingfeng Cui +1 more
TL;DR: What the authors believe to be a new method for designing multilayer diffractive optical elements for wideband with consideration of polychromatic integral diffraction efficiency (PIDE) is presented and the maximum PIDE over the entire waveband for MLDOEs can be obtained.
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Ultrathin zoom telescopic objective
TL;DR: An ultrathin zoom telescopic objective is reported that can achieve continuous zoom change and has reduced compact volume and the total length has been largely reduced.
41
Ultrathin four-reflection imager.
TL;DR: The design and experimental results of pupil-phase encoding and postprocessing were applied to extend the depth of field and compensate a small amount of axial chromatic aberration present in the four-reflection imager prototype.
39
Achromatic and athermal lens design by redistributing the element powers on an athermal glass map.
Tae-Yeon Lim,Sung-Chan Park +1 more
TL;DR: By applying this method to design a Tessar lens, the chromatic and thermal defocuses are reduced to less than the depth of focus, over the specified waveband and temperature ranges.
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