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Optimal selection of aspheric surfaces in optical design

optics EXPRESS 2005年第18期13卷 7233-7242页

作者： Yabe, A Schwaighofstr 34 D-86899 Landsberg Germany

optical systems frequently use aspheric surfaces to improve performance. Typically the designer uses a combination of experience and trail and error to decide which surfaces to make aspheric, then the shape of the aspheric surface is optimized as part of the optical system. In this paper, a method of optimally choosing which surfaces are to be made aspheric is developed. This is implemented by allowing the surface number of the asphere to become a variable in the optimization. Imaginary surfaces are used as an intermediary to make the problem continuous for the optimization. The method of implementation and design examples are given. (c) 2005 optical Society of America

关键词： .selection imaginary optical systems lenses lens design global optimization aspherical eds Proc spie optical design aspheric surface surface number Aspherics design conference International optical escape function

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Challenges using data-driven methods and deep learning in optical engineering 23

Challenges using data-driven methods and deep learning in op...

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conference on Current Developments in Lens design and optical Engineering XXIII part of spie optics and Photonics conference

作者： Buquet, Julie Parent, Jocelyn Lalonde, Jean-Francois Thibault, Simon Univ Laval 2325 Rue Univ Quebec City PQ Canada Immervision 2020 Blvd Robert Bourassa Montreal PQ Canada

ISBN: (纸本)9781510654198;9781510654181

Data driven approaches have proven very efficient in many vision tasks and are now used for optical parameters optimization in application-specific camera design. A neural network is trained to estimate images or image quality indicators from the optical characteristics. The complexity and entanglement of such optical parameters raise new challenges we investigate in the case of wide-angle systems. We highlight them by establishing a data-driven prediction model of the RMS spot size from the distortion using mathematical or AI-based methods.

关键词： computational optics End-to-End design Wide-angle systems Learning-based PSF estimation Distortion Data-driven optical engineering

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optical design of a variable beam angle fiber light source 6

Optical design of a variable beam angle fiber light source

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conference on Illumination optics VI held as part of part of spie optical systems design conference

作者： Rehn, Henning Waespi, Marcel Honig, Tobias Forrer, Martin FISBA AG Rorschacher Str 268 CH-9016 St Gallen Switzerland FISBA Photon GmbH Schwarzschildstr 12 D-12489 Berlin Germany

ISBN: (纸本)9781510645936;9781510645929

In the field of endoscope optics we see more and more zoom designs, realized by tuneable lenses, micro actuators or traditional lens movement in rigid endoscopes with a camera sensor. For such devices, a lighting concept that adapts the beam angle to the current field of view of the zoom optics is desirable. In endoscopes, the light is usually transported from a source to the tip by a light guide or fiber bundle.(1) Since it is not feasible to place an optical system at the fiber exit to fulfill the task, one would make use of the fact that a fiber roughly conserves the angular distribution of incident light and transfer the task of variable beam generation to the light source. We present an optical system that performs this task by conventional optical means outside the endoscope. A LED is imaged to the fiber entrance by a system of variable focal length. By choosing the source etendue equal to that of the fiber, it is ensured that the proper magnification of the imaging is accompanied by the specified angular extent. The LED light is first collimated, and the exit pupil of the collimator is imaged by a system of moving and fix lenses. In a final step, we show a design to adapt a colored light source to the variable beam optics.

关键词： Endoscopy Zoom lens Etendue Variable Beam Illumination design Laser-phosphor sources

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New Approaches to Improve the Illumination optics of Rigid Endoscopes 6

New Approaches to Improve the Illumination Optics of Rigid E...

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conference on Illumination optics VI held as part of part of spie optical systems design conference

作者： Gartner, Alexander Dietzel-Schaarschmidt, Antje Belloni, Paola Furtwangen Univ Inst Tech Med Jakob Kienzle Str 17 D-78054 Villingen Schwenningen Germany Wolf GmbH Henke Sass Keltenstr 1 D-78532 Tuttlingen Germany

ISBN: (纸本)9781510645936;9781510645929

Rigid endoscopes are optical systems characterized by high light losses and poor light transfer efficiencies below 20 %. We investigated this issue first by performing a photometric analysis of three state of the art endoscopes and second by carrying out an optical analysis by means of an optomechanical model with the optical design software LightTools (Synopsys (R)). The light losses in the material and the critical interfaces of the optomechanical model are then analyzed by considering both the spectral power distribution of the light source and the light distribution that is coupled into the endoscope's illumination optics. To improve the illumination optics of rigid endoscopes three approaches are presented in this work: a compound parabolic concentrator and a fiber cone are first developed as alternative coupling elements but only a minor improvement could be realized, because the present optical system is highly constraint by &endue law. Therefore, an immersion element is secondly introduced between coupling element and fiberbundle to reduce backscattering between the interfaces and to increase the overall light transfer efficiency. However, it turned out that a 10 % increased light transfer efficiency can be achieved only by selecting high numerical aperture fibers combined with the immersion element. Third, the influence of the initial coupling element's geometry on the light distribution in the surgical field is investigated. The optical simulations show that by lengthening the coupling element's truncated cone the light can be distributed more uniformly in the surgical field.

关键词： endoscopy illumination optics lightguide fiber coupling optical design efficiency uniformity biological tissue reflectance

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Efficient illumination design method for exterior automotive lighting applications 6

Efficient illumination design method for exterior automotive...

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conference on Illumination optics VI held as part of part of spie optical systems design conference

作者： Schmid, T. Synopsys Inc 199 S Los Robles AveSuite 400 Pasadena CA 91101 USA

ISBN: (纸本)9781510645936;9781510645929

The emergence of OEM and industry benchmarks [1-6] raised the expectation regarding automotive headlamps performance in the last decade, resulting in growing benefits regarding traffic safety. Concomitantly, designing headlamps has grown in complexity, especially for low beam and high beam applications. Fulfilling all requirements concurrently is challenging, not merely due to the large number of requirements to keep track off during development, but predominantly due to the simultaneous inclusion of lamp- (luminous intensity) and vehicle based (illuminance) metrics in the design. In this paper we propose and demonstrate an alternative design methodology for the development of forward lighting systems with the goal of reducing development time, providing superior photometry, and providing more structure to the development process. Instead of iteratively adjusting optical surfaces and running subsequent simulations to validate each design step, checking whether the change could achieve the respective design objective, we are subdividing the overall design problem into multiple steps and solve multiple inverse problems instead. Specifically, we compile all requirements into a unified set of luminous intensity requirements. Subsequently, we create analytical light distributions that meet this total set of requirements. Once validated, the resulting target light distribution is fragmented into multiple light distributions, which are then used as individual design targets for the creation of freeform surfaces in support of each optical sub-component. The total light distribution is obtained by superposition of all partial light distributions.

关键词： automotive lighting low beam high beam automotive regulations automotive benchmarks

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Development of the optical scheme and design of a solar sculptural composition for installation on a city street 24

Development of the optical scheme and design of a solar scul...

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conference on Novel optical systems, Methods, and Applications XXIV part of spie optical Engineering + Applications conference

作者： Tolstoba, Nadezhda D. Bezhoo, Yana N. Bernikov, Mikhael D. ITMO Univ 49 Kronverkskiy Pr St Petersburg 197101 Russia St Petersburg State Art & Ind Acad Solyanoy Lane 13 St Petersburg 191028 Russia

ISBN: (数字)9781510644694

ISBN: (纸本)9781510644694;9781510644687

The report is devoted to the development of an optical scheme and design features for a sculptural group, which is supposed to be installed on a city street. The idea of the composition is that an optical system will be inserted into the sculpture, which will collect sunlight on the image receiver. In this case, the receiver will be wooden. During daylight, the optical elements should leave a track on the receiver. The operating conditions limit the desired disposition of the scheme elements. The manufacturing conditions and the quality of parts restrict the position of the receiver and structural parts. Thus the article will present the options for the optical scheme obtained for the implementation of the sculptural composition, also show optical solutions, which proposed for realization. The project is a part of the graduation project of the Stieglitz Academy's student, and the team from ITMO University helps with the design and calculation of the optical scheme.

关键词： sun sculptural composition geometric optics non-imaging optics solar energy optical design optics and arts

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On the use of differentiable optical models for lens and neural network co-design 3

On the use of differentiable optical models for lens and neu...

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conference on Unconventional optical Imaging III part of spie Photonics Europe conference

作者： Dufraisse, M. Trouve-Peloux, P. Volatier, J-B Champagnat, F. Univ Paris Saclay ONERA DTIS F-91123 Palaiseau France Univ Paris Saclay ONERA DOTA F-91123 Palaiseau France

ISBN: (纸本)9781510651494;9781510651487

Co-design methods started to incorporate neural networks a few years ago when deep learning showed promising results in computer vision. This requires the computation of the point spread function (PSF) of an optical system as well as its gradients with respect to the optical parameters so that they can be optimized using gradient descent. In previous works, several approaches have been proposed to obtain the PSF, most notably using paraxial optics, Fourier optics or differential ray tracers. All these models have limitations and strengths regarding their ability to compute a precise PSF and their computational cost. We propose to compare them in a simple co-design task to discuss their relevance. We will discuss the computational cost of these methods as well as their applicability.

关键词： Co-design Neural network optics

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design of microlens arrays with aspheric surfaces for uniform illumination 6

Design of microlens arrays with aspheric surfaces for unifor...

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conference on Illumination optics VI held as part of part of spie optical systems design conference

作者： Petrova, Galina N. Petrov, Nikolai, I Russian Acad Sci Sci & Technol Ctr Unique Instrumentat 15 Butlerova Str Moscow 117342 Russia

ISBN: (纸本)9781510645936;9781510645929

The methods of wave optics and ray-field tracing are implemented for modeling microlens arrays (MLAs), taking into account the effects of coherence and polarization of the light source, randomization of the parameters of microlens arrays. The influence of the parameters of the radiation source (wavelength, curvature of the wavefront, beam radius, coherence radius, etc.) and the microlens array (periodic or random, aspect ratio, pitch size, refractive index, shape and profile of the array surface (convex, concave, aspheric), etc.) on the output parameters (intensity distribution, radiation pattern, optical efficiency) of the diffracted beam is studied. The numerical simulation of the intensity distribution and the spreading angle of diffracted beam is carried out. To calculate the optical efficiency of microlens arrays, a new approach to the ray field based on the coherent state representation has been developed. Such wave rays can simply be tracked along arbitrary curved surfaces. A user-friendly interface has been developed for entering the initial parameters of the light source and the MLA array, as well as for displaying graphical and informational modeling results. The measured intensity distributions of diffracted radiation by microlens array are compared with the simulation results for LD and LED sources.

关键词： microlens arrays micro-optics illumination aspheric surfaces diffractive elements coherence and polarization optical efficiency user-friendly interface

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Tackling freeform aberrations by ray-mapping analysis

Tackling freeform aberrations by ray-mapping analysis

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International optical design conference (IODC)

作者： Herkommer, Alois M. Yang, Haiyue Univ Stuttgart Inst Tech Opt D-70569 Stuttgart Germany

We investigate the propagation of a four-dimensional ray grid through freeform optical systems. By analyzing the linear and nonlinear part of this ray-mapping at each surface we can quantify surface aberration contrib... 详细信息

ISBN: (纸本)9781628413786

关键词： Geometric optical design Aberrations Etendue Freeform optics

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Evaluate the Effective of Annular Aperture on the OTF for Fractal optical Modulator 22

Evaluate the Effective of Annular Aperture on the OTF for Fr...

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conference on Infrared Remote Sensing and Instrumentation XXII held a part of the Annual spie optics + Photonics Meeting

作者： Mohammed, Abdulrazak A. S. Salahaddine Univ Engn Coll Surveying Engn Dept Erbil Iraq

ISBN: (纸本)9781628412468

The fractal optical modulator is the optical modulator design by using the fractal function. As well known there is an effect of aperture's shape on the OTF signal for optical modulator. In present paper an aberration-free single annular aperture has used and the MTF characteristics responses investigate for fractal optical modulator of *** annular aperture provide several frequency transmission bands within the region up to cut-off frequency. The result compared with the spatial frequency for circular shape of fractal optical modulator aperture.

关键词： Fractal analysis optical transfer functions optical modulators Modulation transfer functions Modulators Spatial frequencies Imaging infrared seeker Iterated function systems Modulation optical design

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