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optical performance analysis of plenoptic camera systems 15

Optical performance analysis of plenoptic camera systems

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conference on current developments in lens design and optical engineering XV

作者： Langguth, Christin Oberdoerster, Alexander Brueckner, Andreas Wippermann, Frank Braeuer, Andreas Fraunhofer Inst Appl Opt & Precis Engn D-07745 Jena Germany

ISBN: (纸本)9781628412192

Adding an array of microlenses in front of the sensor transforms the capabilities of a conventional camera to capture both spatial and angular information within a single shot. This plenoptic camera is capable of obtaining depth information and providing it for a multitude of applications, e.g. artificial re-focusing of photographs. Without the need of active illumination it represents a compact and fast optical 3D acquisition technique with reduced effort in system alignment. Since the extent of the aperture limits the range of detected angles, the observed parallax is reduced compared to common stereo imaging systems, which results in a decreased depth resolution. Besides, the gain of angular information implies a degraded spatial resolution. This trade-off requires a careful choice of the optical system parameters. We present a comprehensive assessment of possible degrees of freedom in the design of plenoptic systems. Utilizing a custom-built simulation tool, the optical performance is quantified with respect to particular starting conditions. Furthermore, a plenoptic camera prototype is demonstrated in order to verify the predicted optical characteristics.

关键词： plenoptic camera depth of field depth resolution optical performance analysis customized microlens array

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Silicon Metalens toward a fully Silicon integrated SWIR sensing 25

Silicon Metalens toward a fully Silicon integrated SWIR sens...

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conference on current developments in lens design and optical engineering XXV

作者： Dupre, Matthieu Ma, Jian Hseih, Biay-cheng Goma, Sergio Qualcomm Technol Inc 5775 Morehouse Dr San Diego CA 92121 USA

ISBN: (纸本)9781510679221;9781510679238

Most Silicon based depth and lidar sensors rely on near-infrared (NIR 750-900nm) sources to produce depth images as Silicon CMOS sensors can achieve a high quantum efficiency for an unbeatable cost at such wavelengths. Advances in short wave infrared (SWIR) sensor technologies, such as Silicon-Germanium sensors, changes this paradigm and opens a new window for groundbreaking sensor designs, as SWIR can push the wavelength above retinal hazard area (>1400nm), allowing for much higher eye safety, due to the low penetration of those wavelengths through the eye lens. Here, we propose to use a Silicon Metalens flat optics and build upon our stacked sensor technologies to obtain a fully Silicon integrated stacked sensor at SWIR wavelengths. We will discuss the design of the stacked sensor and focus on the Silicon Metalens for multiple use-cases. We will demonstrate the results of our Silicon metalens prototype at 1550nm. We will show numerical simulations of the optical stack for eye-tracking application or wide-angle time of flight (TOF) and discuss the necessary trade-offs.

关键词： metalens ToF sensors XR optics lens design

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Predictability and unpredictability in optical system optimization

Predictability and unpredictability in optical system optimi...

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conference on current developments in lens design and optical engineering Viii

作者： van Turnhout, Maarten Bociort, Florian Delft Univ Technol Opt Res Grp Lorentzweg 1 NL-2628 CJ Delft Netherlands

ISBN: (纸本)9780819468154

Local optimization algorithms, when they are optimized only for speed, have in certain situations an unpredictable behavior: starting points very close to each other lead after optimization to different minima. In these cases, the sets of points, which, when chosen as starting points for local optimization, lead to the same minimum (the so-called basins of attraction), have a fractal-like shape. Before it finally converges to a local minimum, optimization started in a fractal region first displays chaotic transients. The sensitivity to changes in the initial conditions that leads to fractal basin borders is caused by the discontinuous evolution path (i.e. the jumps) of local optimization algorithms such as the damped-least-squares method with insufficient damping. At the cost of some speed, the fractal character of the regions can be made to vanish, and the downward paths become more predictable. The borders of the basins depend on the implementation details of the local optimization algorithm, but the saddle points in the merit function landscape always remain on these borders.

关键词： optimization optical system design saddle points fractals basins of attraction

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"Moth's eye" anti-reflection gratings on germanium freeform surfaces 15

"Moth's eye" anti-reflection gratings on germanium freeform ...

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conference on current developments in lens design and optical engineering XV

作者： Liu, Meng Shultz, Jason A. Owen, Joseph D. Davies, Matthew A. Suleski, Thomas J. Univ N Carolina Ctr Optoelect & Opt Commun Charlotte NC 28223 USA Univ N Carolina Ctr Precis Metrol Charlotte NC 28223 USA

ISBN: (纸本)9781628412192

Germanium is commonly used for optical components in the infrared, but the high refractive index of germanium causes significant losses due to Fresnel reflections. Anti-reflection (AR) surfaces based on subwavelength "moth's eye" gratings provide one means to significantly increase optical transmission. As found in nature, these gratings are conformal to the curved surfaces of lenslets in the eye of the moth. Engineered optical systems inspired by biological examples offer possibilities for increased performance and system miniaturization, but also introduce significant challenges to both design and fabrication. In this paper, we consider the design and fabrication of conformal moth's eye AR structures on germanium freeform optical surfaces, including lens arrays and Alvarez lenses. Fabrication approaches and limitations based on both lithography and multi-axis diamond machining are considered. Rigorous simulations of grating performance and approaches for simulation of conformal, multi-scale optical systems are discussed.

关键词： biomimetic optics freeform surfaces conformal optics moth's eye gratings infrared optical modeling diamond machining interference lithography

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lens design and system optimization for foveated imaging

Lens design and system optimization for foveated imaging

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conference on current developments in lens design and optical engineering IX

作者： Curatu, George Harvey, James E. LightPath Technol 2603 Challenger Tech Ct Orlando FL 32826 USA Univ Cent Florida Orlando FL 32816 USA

ISBN: (纸本)9780819472809

Foveated imaging addresses the need for compact wide-angle imagers capable of high-resolution and compressed data transmission. The principle behind foveated imaging is to cover a wide field-of-view (FOV) with a relatively simple and compact low-resolution lens, and use a liquid crystal spatial light modulator (SLM) to correct wavefront aberrations at any selected field point. The SLM correction provides a high-resolution fovea that can be actively moved anywhere within the FOV. While most research has focused so far mainly on SLM performance, the general trend being to increase SLM resolution and modulation depth, the actual lens design and system optimization aspects were often neglected. In this paper, we propose a wide-angle lens design intended for foveated imaging applications, and discuss typical tradeoffs. Taking this design as an example, we present a method to estimate the smallest SLM resolution required to correct the wavefront error effectively, showing that with the appropriate design, this resolution can be reduced up to 10 times compared to current designs. Increasing the SLM resolution beyond this point and increasing the modulation depth above one wavelength is not necessary, and will actually reduce the performance of the imaging system. We also demonstrate the importance of fabrication tolerances, and we propose a method to calibrate the SLM in order to cancel out all additional wavefront aberrations introduced by fabrication and assembly errors.

关键词： foveated imaging adaptive optics wide-angle lenses aberration compensation spatial light modulators liquid crystal devices

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Accelerating diffractive optics design with GPU-based parallel technique

Accelerating diffractive optics design with GPU-based parall...

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conference on current developments in lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Liu, Kan Li, Hui Zhang, Xinyu Li, Dehua Wei, Mingyue Li, Bin Xie, ChangSheng Zhang, Tianxu Huazhong Univ Sci & Technol Inst Pattern Recognit & Artificial Intelligence State Key Lab Multispectral Informat Proc Technol Wuhan 430074 Hubei Peoples R China Wuhan Natl Lab Optoelect Wuhan 430074 Peoples R China

ISBN: (纸本)9780819482822

In this paper GPU based data parallel technique is used to reduce calculating time in diffractive optics elements (DOE) design. By using compute unified device architecture (CUDA) framework, comparison of acceleration radio of some major methods using in DOE design, including Gerchberg Saxton algorithm for global optimization in conjunction with Rayleigh-Sommerfeld diffractive integrating transformation, genetic algorithm with a finite-difference time-domain method and simulated annealing algorithm, is made with demonstrational DOE-lens design, whose focal spot size is 0.5 mu m, incident light wavelength is 650 nm, focal length is 3mm, DOE aperture size is 2mm.

关键词： DOE design GPU acceleration CUDA Algorithm comparison

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PROPAGATION METHODS FOR THE ANALYSIS OF BISTABLE DEVICES AND SPATIAL LIGHT MODULATORS BASED ON NONLINEAR MOLECULAR MEDIA

PROPAGATION METHODS FOR THE ANALYSIS OF BISTABLE DEVICES AND...

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conference on current developments in optical design and optical engineering iii

作者： SPEISER, S GROSWASSER, D ORENSTEIN, M TECHNION ISRAEL INST TECHNOL DEPT CHEMIL-32000 HAIFAISRAEL

ISBN: (纸本)081941249X

We already discussed the bistable behavior of a Fabry Perot resonator filled with molecular media as well as the characteristics of a spatial light modulator (SLM) based on the nonlinearity induced by excited state absorption. In the present paper we present two practical configurations. First we analyze a cavity-less bistable element which removes some of the realization problems related to high finess cavity. In this configuration the nonlinear medium is located in one arm of an optical interferometer. The scheme provides the required amount of positive feedback by the bistable mechanism -- but without a cavity. We applied the nonlinear eikonal approximation, a method which takes care of the detailed propagation effects, and obtained conditions for bistability, as well as optimizing the design parameters such as the output mirror reflectivity, etc.

关键词： optical fibers Nonlinear optics Spatial light modulators Bistability Interferometers Mirrors Absorption Reflectivity Beam propagation method Resonators

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Diffraction and geometrical optical transfer functions: calculation time comparison 18

Diffraction and geometrical optical transfer functions: calc...

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conference on current developments in lens design and optical engineering XViii

作者： Antonio Diaz, Jose Mahajan, Virendra N. Univ Granada Dept Opt E-18071 Granada Spain Univ Arizona Coll Opt Sci Tucson AZ 85721 USA

ISBN: (纸本)9781510612082;9781510612075

In a recent paper, we compared the diffraction and geometrical optical transfer functions (OTFs) of an optical imaging system, and showed that the GOTF approximates the DOTF within 10% when a primary aberration is about two waves or larger [Appl. Opt., 55, 3241-3250 (2016)]. In this paper, we determine and compare the times to calculate the DOTF by autocorrelation or digital autocorrelation of the pupil function, and by a Fourier transform (FT) of the point-spread function (PSF);and the GOTF by a FT of the geometrical PSF and its approximation, the spot diagram. Our starting point for calculating the DOTF is the wave aberrations of the system in its pupil plane, and the ray aberrations in the image plane for the GOTF. The numerical results for primary aberrations and a typical imaging system show that the direct integrations are slow, but the calculation of the DOTF by a FT of the PSF is generally faster than the GOTF calculation by a FT of the spot diagram.

关键词： optical transfer function aberrations geometrical OTF diffraction OTF imaging

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Cemented doublet field compressor/corrector: a new optical component of general utility - art. no. 628802

Cemented doublet field compressor/corrector: a new optical c...

引用

conference on current developments in lens design and optical engineering VII

作者： Schaack, David F. Designs Syst Albuquerque NM 87112 USA

ISBN: (纸本)0819463671

Field correcting lenses have been used to increase the fields of view of large telescopes since at least Ross's work in 1935. In recent years, due to the advent of electronic image sensors, there has been movement toward combining field correction with focal length reduction in so-called field compressor/corrector or telecompressor lenses. Such lenses are now commonly employed in both professional and amateur astronomy. This paper demonstrates that field compressor/corrector lenses can be of great utility in a wider context -- the design of optical instruments. In the finite conjugate and relay applications prevalent in optical instrument design, standard achromats are often employed because there is currently no better alternative short of custom lenses. I show that there exists a particularly attractive family of cemented doublet compressor/correctors that can be combined with standard achromats to greatly improve the imaging performance obtainable in these applications. I propose that these field compressing/correcting doublets should be made available from stock as standard optical components. I introduce a novel viewpoint for analyzing the imaging capability of a lens that makes it simple to visualize the performance obtainable with a lens when it is employed over a wide range of fields and focal ratios. Using the new viewpoint, I demonstrate the performance improvement obtainable when employing the new compressor/correctors. I also show that the new lenses are flexible, that is, that one may obtain their advantages while employing them with a range of achromats or over a range of focal lengths, and that the alignment tolerances between the achromat and the field compressor/corrector are modest.

关键词： field corrector field compressor focal reducer stock lens catalog lens cemented doublet image quality

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Efficient 3M PBS Enhancing Miniature Projection Optics 17

Efficient 3M PBS Enhancing Miniature Projection Optics

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conference on current developments in lens design and optical engineering XVII

作者： Yun, Zhisheng Nevitt, Timothy Willett, Stephen Mortenson, Dave Le, John McDowell, Erin Kent, Susan Wong, Timothy Beniot, Gilles J. Ouderkirk, Andrew 3M Co Elect Mat Solut Div St Paul MN 55144 USA 3M Co Elect & Energy Grp Lab St Paul MN 55144 USA

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

Over the past decade, 3M has developed a number of mobile projectors, with a goal towards providing the world's smallest, most efficient projection systems. Compact size and efficiency are required characteristics for projection systems used in mobile devices and more lately, in augmented reality systems. In this paper we summarize the main generations of 3M light engine optical designs. We present the optical architectures of four light engines, including the rationale behind the illumination designs and the projection systems. In particular, we describe various configurations relating to the 3M polarizing beam splitter (PBS) which is key to enhanced efficiency of the miniature projection systems.

关键词： Augmented reality (AR) Head Mounted Display Polarizing beam splitter (PBS) Projection system design Pico projector Illumination system design Projection lens

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