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current developments in lens design and optical engineering XXI

Current Developments in Lens Design and Optical Engineering ...

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current developments in lens design and optical engineering XXI 2020

ISBN: (纸本)9781510637702

The proceedings contain 14 papers. The topics discussed include: ultrashort throw lenses with catadioptric relay suitable for flat and curved screens;light field displays for near eye VR and AR;wide angle lens with improved relative illumination characteristics;optimization of a mobile phone camera for as-built performance;inverse designed flat optics with multilevel diffractive lenses;optical design of triple-mode seeker;comparison of passive athermalization results of LWIR optical designs utilizing different infrared optical materials;and design of an anastigmatic three-mirror telescope using freeform surfaces.

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optical design process of a human eye inspired lens 23

Optical design process of a human eye inspired lens

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Conference on current developments in lens design and optical engineering XXIII Part of SPIE Optics and Photonics Conference

作者： Allain, Guillaume Thibault, Simon Univ Laval Fac Sci & Genie Dept Phys Genie Phys & Opt 1045 Ave Med Laval PQ G1V 0A6 Canada COPL 2375 Rue Terrasse Quebec City PQ G1V 0A6 Canada

ISBN: (纸本)9781510654198;9781510654181

Bio-inspired optical design can be described as a conscious decision in the design process to take inspiration from physical adaptation that were brought up by natural selection. The usual goal is to introduce non-conventional techniques or material in order to achieve better performance or novel applications. However, when the target is to imitate closely the form-factor, appearance and optical properties of a biological system, new requirements are added to the design process and new problems arises. In this paper, we will expose the design of an optical system that draws most requirements from both the optical properties and the form-factor of the human eye. However, contrary to human eye models, the main requirements for this project is to make a realistic design which can be assembled as a prototype. The design process will be laid out, by firstly introducing system requirements and various performance targets that comes from the bio-inspired design. The constraints associated with using entrance pupil's appearance as a requirement will be presented. This paper will also specifically be looking at distortion as a solution for modulating resolution throughout the field of view and as a tool to aid in those novel problems.

关键词： optical design Bio-inspired design Human eye optical design methodology optical Distortion

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Widely tunable large area thin liquid crystals lens 23

Widely tunable large area thin liquid crystals lens

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Conference on current developments in lens design and optical engineering XXIII Part of SPIE Optics and Photonics Conference

作者： Garcia, Javier Pereiro Cano-Garcia, Manuel Arregui, Xabier Quintana Oton, Jose Manuel Vela, Carlos Carrasco de la Rosa del Val, Pablo Geday, Morten Andreas Univ Politecn Madrid CEMDATIC ETSI Telecomunicac Ave Complutense 30 ES-28040 Madrid Spain

ISBN: (纸本)9781510654198;9781510654181

Reconfigurable diffractive lenses manufactured in liquid crystal are presented. The lenses show an unprecedented performance in terms of active diameter and focal distance range when compared to any other transparent adaptive lens. The lenses are characterized by an active area free of electronic components, with a fill factor of 98% which combined with a low operating voltage (<10V(rms)), open for applications ranging from eye contact lenses to space applications. The addressing of the liquid crystal is done exclusively from the periphery of the device. The lenses are based on tunable spiral diffractive lenses (SDL) for which the focal length may be changed by changing the topological charge, i.e. twist of the spiral in the lens. The twist in the resulting wavefront is eliminated by cascading two spiral plates with opposite twists emulating a conventional diffractive lens. The presented lenses have a tuning range from -2 to +2 diopters and an active diameter of 25mm.

关键词： Liquid Crystal flat lens adaptive optics diffractive optics optical vortex optical angular momentum

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Achieving multiple beam patterns using 3-D printed lens by changing the position of LEDs 23

Achieving multiple beam patterns using 3-D printed lens by c...

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Conference on current developments in lens design and optical engineering XXIII Part of SPIE Optics and Photonics Conference

作者： Udage, Akila S. Narendran, Nadarajah Rensselaer Polytech Inst Lighting Res Ctr 21 Union St Troy NY 12180 USA

ISBN: (纸本)9781510654198;9781510654181

As lighting has diversified across many applications, optical designers have been challenged to produce application-specific optical systems. For an instance where multiple beam distributions are required in an application, instead of making individual lenses catering to different beam shapes, it would be beneficial to create a single optic that can be used with different LED source positioning. Hence, this study proposes a method of positioning LEDs in a fixture to achieve multiple beam patterns using a fixed lens design. Through ray-tracing analysis, we showed that different beam distributions could be obtained by changing the LED position in a refractive lens array. The experimental study was conducted with a 3D-printed lens to validate the model. The results confirm the possibility of creating a single fixed lens to achieve multiple beam distributions via different LED positioning. The proposed novel method can replace the expensive and cumbersome process of developing separate lenses for each beam distribution. Further, our experimental results can guide fixture manufacturers on the use of 3D-printed optics for lighting applications.

关键词： Beam shaping Multiple beams Lighting 3D printing Optics Additive manufacturing

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An endoscopic lens with internal focusing 23

An endoscopic lens with internal focusing

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Conference on current developments in lens design and optical engineering XXIII Part of SPIE Optics and Photonics Conference

作者： Rehn, Henning Forrer, Hans Mehne, Christian Betke, Alexander Bobic, Neven Schumm, Tobias Graf, Christian Klein, Kirsten Hein, Simon Miernik, Arkadiusz FISBA AG Rorschacher Str 268 CH-9016 St Gallen Switzerland FISBA Photon GmbH Schwarzschildstr 12 D-12489 Berlin Germany Actuator Solut GmbH Richard Stucklen Str 19 D-91710 Gunzenhausen Germany KARL STORZ SE & Co KG Dr Karl Storz Str 34 D-78532 Tuttlingen Germany Univ Freiburg Med Ctr Fac Med Dept Urol Hugstetter Str 55 D-79106 Freiburg Germany

ISBN: (纸本)9781510654198;9781510654181

We report optical and optomechanical design of a new endoscopic system for the urinary bladder. On the basis of the specification, key requirements of the optics are derived. The required high resolution goes hand in hand with a depth of field much smaller than the intended object distance range and raises the need for image focusing. Such a focus mechanism was realized in the small endoscope tip volume with the help of smart memory alloy wires and a matching optical and mechanical design. MTF measurements and practical tests demonstrate a proper function of a prototype of the device.

关键词： Endoscope lens Chip on Tip Internal Focusing

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design of projection-based augmented reality system using holographic screen display 23

Design of projection-based augmented reality system using ho...

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Conference on current developments in lens design and optical engineering XXIII Part of SPIE Optics and Photonics Conference

作者： Nishikawa, Jun Nakamura, Tomoharu Sony Grp Corp R&D Ctr Atsugi TEC 4-14-1 Asahi Cho Atsugi Kanagawa 2430014 Japan

ISBN: (纸本)9781510654198;9781510654181

Holographic display elements (HOEs) with a high diffraction efficiency and size enlargement have been developed since 2019. To achieve high brightness and low haze, unprecedented optical systems have been proposed with a uniform chief ray angle of 0 degrees in the x-section and 70 degrees in the y-section of the HOEs. A 360 degrees cylindrical holographic screen display (CHSD) was obtained by providing a large tilt to the surface shape near the optical axis. This was done using a first-order odd aspherical coefficient for the light flux from a refractive optical system (RO). A flat holographic screen display (FHSD) is a compact, high-performance display that uses three decentered and tilted freeform mirrors to route light flux from the RO in a ball-like form. Prototyping also proposes the possibility of an augmented reality system that takes advantage of the high transparency. The design for further miniaturization while maintaining optical performance was also discussed, in which the size of the first mirror was reduced by reducing the half-field angle of the RO to approximately 6 degrees. Furthermore, by increasing the negative power of the second mirror, the small size could be maintained The size of the last mirror was dependent on the screen size and could not be reduced. By laying down the posture of this mirror, we were able to halve the size reduction in the vertical direction. In this paper, lens designs for CHSDs and FHSDs are reported. The potential of this display is also discussed.

关键词： Holographic optical elements augmented reality display freeform mirror projection lens lens design

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Multifocal Contact lens HDR Image Simulation Showing Dysphotopsia 23

Multifocal Contact Lens HDR Image Simulation Showing Dysphot...

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Conference on current developments in lens design and optical engineering XXIII Part of SPIE Optics and Photonics Conference

作者： Cvarch, Ben Schwiegerling, Jim Univ Arizona James C Wyant Coll Opt Sci 1630 E Univ Blvd Tucson AZ 85721 USA

ISBN: (纸本)9781510654198;9781510654181

A system is developed for simulating the image quality and dysphotopsia of multifocal lenses. To achieve this, the simulation modifies a High Dynamic Range (HDR) photograph by blurring it with the lens' point spread function in MATLAB. Dysphotopsias are instances of unwanted or missing light within the eye. Common forms of dysphotopsia include glare, starburst (radial lines emanating from bright sources), and halo (rings of light surrounding bright sources) with the latter two typically occurring at night or in other high contrast settings. Dysphotopsia is considered the most common complaint of patients after successful cataract surgery and have thus earned significant attention in the context of intraocular lenses (IOLs). There have been fewer studies of multifocal contact lens dysphotopsia, but this is despite the documented impact dysphotopsia has on the image quality of multifocal lenses. This simulation is the first handling of dysphotopsia that combines HDR images and specifics of the lens design to predict how the dysphotopsia will appear to patients. Being able to show patients accurate simulations of dysphotopsia has the benefit of setting proper patient expectations before they begin using multifocal lenses. Furthermore, these simulated images can also potentially help diagnose patient problems by giving patients an accurate baseline to compare to.

关键词： Multifocal contact lenses presbyopia dysphotopsia HDR optical simulation vision

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Latest advancements at NILT on flat metalens-based camera modules in near-infrared 23

Latest advancements at NILT on flat metalens-based camera mo...

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Conference on current developments in lens design and optical engineering XXIII Part of SPIE Optics and Photonics Conference

作者： Mattinson, Fredrik Quaade, Ulrich Johansen, Villads Egede Samadi, Akbar Fly, Jesper Schmidlin, Moritz NIL Technol ApS Haldor Topsoes Alle 1 DK-2800 Lyngby Denmark

ISBN: (纸本)9781510654198;9781510654181

NIL Technology (NILT) is an optical solutions company designing, developing, and manufacturing flat optical elements and components with nanoscale features such as diffractive optical elements (DOEs) and meta optical elements (MOEs). NILT's MOE lenses have recently demonstrated a groundbreaking 94% absolute efficiency at 940 nm. This major milestone, in combination with other efforts such as the subsequent module integration and enabling of mass production of MOE elements, are among the key development areas for successful adoption of MOE lenses in various markets, ranging from consumer to automotive and applications such as sensing and machine vision systems. Here, we report our recent achievements with a camera module based on an MOE lens. We have successfully designed and manufactured camera modules using a single MOE lens showing excellent performance compared to refractive lens counterparts. The design has a low f-number and extremely high relative illumination. Prototypes are prepared using e-beam lithography, whereas MOE lenses in mass production are manufactured using nanoimprint lithography. The characterization of the MOE lenses reveals full agreement with the simulated nominal design. Image artifacts can appear due to higher orders of diffraction if the MOE lenses are not designed and manufactured properly. To illustrate the promise for volume production, a tolerance analysis has been performed, where the system tolerance analysis shows yield versus performance. At the module level, a straylight study, including ghost image and finally, thermal stability has been analyzed. The tolerance and thermal analysis are not presented in this manuscript. These results show the advantages of using 'NILT's high-efficiency meta optical elements compared to traditional optical systems.

关键词： metalens metasurface diffractive lens DOE MOE diffraction efficiency meta-atom

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A Toolkit for Multiscale optical System Inverse-design 23

A Toolkit for Multiscale Optical System Inverse-Design

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Conference on current developments in lens design and optical engineering XXIII Part of SPIE Optics and Photonics Conference

作者： Campbell, Sawyer D. Jenkins, Ronald P. Zerbe, Benjamin A. Whiting, Eric B. Balasubramanian, Manushanker Das, Arkaprovo Young, Jacob T. Werner, Douglas H. Werner, Pingjuan L. Penn State Univ Sch Elect Engn & Comp Sci University Pk PA 16802 USA

ISBN: (纸本)9781510654198;9781510654181

optical system design is undergoing a transformational change with the increases in computational horsepower, cutting-edge algorithmic developments, and the advent of new nanofabrication technologies. Among the most exciting advances in recent memory are optical metasurfaces, which are patterned surfaces commonly realized through nanofabrication that can imbue optical engineers with expanded degrees of design freedom due to their ability to exploit the generalized form of Snell's law. Through intelligent optimization and design, metasurfaces can be constructed which achieve arbitrary chromatic dispersion behaviors and unprecedented control over polarization that simply cannot be realized with conventional optical elements. However, designing high-performance metasurfaces requires the use of full-wave simulation tools and numerical optimization techniques which necessitate considerable computational resources. Moreover, while optical metasurfaces are moving towards millimeter and centimeter scale diameter lenses with advances in nanofabrication techniques, it is computationally infeasible to employ full-wave simulation tools directly to model optical systems that use such large size elements. Nevertheless, the size, weight, and power (SWaP) advantages afforded by optical metasurfaces make them a compelling choice for designers to consider in a number of applications, which are currently limited by bulky conventional optical solutions. Therefore, techniques that can rapidly model metasurfaces in conjunction with conventional optical elements such as lenses, mirrors, and prisms are highly desirable. In this presentation, we highlight a toolkit of custom solvers, design procedures, and powerful optimization algorithms that simplify and accelerate the development of hybrid optical systems with arbitrary combinations of conventional and metasurface elements.

关键词： optical design optimization inverse-design gradient-index lenses metasurfaces simulation multiscale

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Spectrally aligned integration of miniaturized substrate-free thin-film filters for fiber optical networks 14

Spectrally aligned integration of miniaturized substrate-fre...

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current developments in lens design and optical engineering XXIV 2023

作者： Gehrke, Philipp Rüsseler, Anna K. Hoffmann, Gerd A. Wienke, Andreas Kracht, Dietmar Ristau, Detlev Laser Zentrum Hannover e.V. Hollerithallee 8 HannoverD-30419 Germany Welfengarten 1a HannoverD-30167 Germany Gottfried Wilhelm Leibniz Universität Hannover Welfengarten 1 HannoverD-30167 Germany

ISBN: (纸本)9781510665460

This paper presents the active alignment of miniaturized, substrate-free optical thin-film filters (TFFs) according to the filters’ spectral transfer properties for integration into fiber optical networks. optical TFFs are often designed for a specific narrow angle of incidence (AOI) range. Hence, a sufficient manufacturing precision of the angled photonic components connected to the optical filter is needed. These components then can no longer be used for different scenarios where i.e. the incident angle is changed. Conversely, the individual miniaturized optical filter chips can also vary in specification due to slight inhomogeneities during the production on a large-scale wafer. Therefore, not all filter chips on the wafer meet the demanded specifications at the designed AOI, resulting in a reduced yield. Moreover, it requires a time-consuming separation into different quality classes by measuring single filter chips on the wafer. To maximize the amount of usable chips, a procedure was developed to actively align the chips inside a precision optics assembly system by measuring the transmitted power at different wavelengths while tilting them towards the optical axis. When the optimal angle is found, the chip is glued into the optical network platform. Next to maximizing the yield, the production steps can be reduced because the prior separation into quality classes becomes redundant. Manufacturing tolerances during the thin-film deposition are equalized due to the active spectral alignment on a universal optical platform. With this technique, a more versatile process for TFF integration compared to passively aligned assemblies on fixed angle components is demonstrated. © 2023 SPIE.

关键词： Integration

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