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检索条件"任意字段=Conference on Current Developments in Lens Design and Optical Engineering XXII"

共 444 条记录，以下是261-270 订阅

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optical performance as a function of phosphor particle number in white LED

Optical performance as a function of phosphor particle numbe...

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

作者： Chen, Cheng-Chien Chen, Ching-Yi Chien, Wei-Ting Yang, Tsung-Hsun Sun, Ching-Cherng Natl Cent Univ Inst Lighting & Display Sci Dept Opt & Photon Chungli 320 Taiwan

ISBN: (纸本)9780819482822

In this paper, we demonstrate a method to calculate the phosphor particle numbers and study the relationship among phosphor particle numbers, light output and correlated color temperature (CCT) of LEDs under remote package type and dispensing package type. We also discuss the influence of the thickness and concentration of phosphors on the performance of LEDs. We compare the various thicknesses and concentrations to check the resultant CCT and the output flux, where we can see that the lumen output is almost equal as the phosphor particle numbers is similar with the CCT at 6500 +/- 200 and 5000 +/- 100 K under the remote package type.

关键词： Particle number CCT Phosphor

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Effects and prediction of stray light produced by diffractive lenses

Effects and prediction of stray light produced by diffractiv...

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8th conference on current developments in optical design and optical engineering

作者： Thibault, S Renaud, N Wang, M INO Opt Engn Grp St Foy PQ G1P 4N8 Canada

ISBN: (纸本)0819432652

Correlation between computational models and corresponding experimental data of stray light produced by unwanted diffraction orders of diffractive lenses is described. It is shown that the attractive scaler model under Fresnel approximation does not agree with experimental data. The validity of Fresnel approximation for multi-order focusing optics is derived to explain the limitation of the scaler approach. Geometrical models with both coherent and incoherent summation of each diffractive orders coupled with efficiency estimation is used with success. The model takes into account the local diffraction efficiency and also of the number of diffractive orders supported locally by the structure. This geometrical optics model can be used in standard optical design software. Therefore it may be recommended as an additional tool for stray light analysis at the design stage of hybrid refractive/diffractive optical systems. In a second part, the impact of unwanted diffraction orders when diffractive optics is used in visible imaging systems is discussed. Several experimental observations about the use of plastic refractive/diffractive lens in relation to different fabrication process used to build the lens are also discussed. From those observations, we recommend an approach to reduce the stray light produced by the diffractive lens. In conclusion, a serious stray light analysis is mandatory in the design of visible imaging systems using diffractive lenses.

关键词： stray light diffractive optical element imaging optical design

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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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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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Basic optical Properties of the Photoelastic Modulator Part III: Thermal Properties

Basic Optical Properties of the Photoelastic Modulator Part ...

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conference on current developments in lens design and optical engineering XIII

作者： Hirschy, Linda Wang, Baoliang (Bob) Wolf, Jacob Lakanen, Bob Hartmann, Brittany Hinds Instruments Inc Hillsboro OR 97124 USA

ISBN: (纸本)9780819492036

Hinds Instruments has provided photoelastic modulators (PEMs) to the photonics industry for over 40 years. In the past Bob Wang, et al. from Hinds have made two presentations(,1,2) at SPIE meetings, Basic optical Properties of the Photoelastic Modulator Part I: Useful Aperture and Acceptance Angle and Part II: Residual Birefringence in the optical Element. This presentation, Part III in the series, addresses the characteristics of the PEM that vary with temperature, highlighting effects on frequency and signal drift due to retardation changes. In addition, Part III will introduce a new PEM with advanced thermal control (PEM-ATC (TM)). Data is presented that shows the increased stability of the PEM frequency and retardation signal using this new device.

关键词： photoelastic modulator PEM polarization modulation thermal stability modulation frequency

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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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design and analysis of an adaptive lens that mimics the performance of the crystalline lens in the human eye 15

Design and analysis of an adaptive lens that mimics the perf...

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conference on current developments in lens design and optical engineering XV

作者： Santiago-Alvarado, Agustin Cruz-Felix, Angel S. Iturbide-Jimenez, F. Martinez-Lopez, M. Ramirez-Como, M. Armengol-Cruz, V. Vasquez-Baez, I. Mixteca Technol Univ Huajuapan De Leon 69000 Oax Mexico

ISBN: (纸本)9781628412192

Tunable lenses are optical systems that have attracted much attention due to their potential applications in such areas like ophthalmology, machine vision, microscopy and laser processing. In recent years we have been working in the analysis and performance of a liquid-filled variable focal length lens, this is a lens that can modify its focal length by changing the amount of water within it. Nowadays we extend our study to a particular adaptive lens known as solid elastic lens (SEL) that it is formed by an elastic main body made of Polydimethylsiloxane (PDMS Sylgard 184). In this work, we present the design, simulation and analysis of an adaptive solid elastic lens that in principle imitates the accommodation process of the crystalline lens in the human eye. For this work, we have adopted the parameters of the schematic eye model developed in 1985 by Navarro et al.;this model represents the anatomy of the eye as close as possible to reality by predicting an acceptable and accurate quantity of spherical and chromatic aberrations without any shape fitting. An opto-mechanical analysis of the accommodation process of the adaptive lens is presented, by simulating a certain amount of radial force applied onto the SEL using the finite element method with the commercial software SolidWorks (R). We also present ray-trace diagrams of the simulated compression process of the adaptive lens using the commercial software OSLO (R).

关键词： Solid elastic lens tunable lens crystalline lens PDMS

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design and Fabrication of Super mirrors on the Zerodur substrate

Design and Fabrication of Super mirrors on the Zerodur subst...

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

作者： Cho, Hyun-Ju Jeon, Young-Zip Daeduk Univ Dept Firearms & Opt 48 Jang Dong Taejon 305715 South Korea Daeduk Univ Dept Special Weapon Taejon 305715 South Korea

ISBN: (纸本)9780819482822

Super mirror is a high reflectance mirror with very low absorption and scattering losses. We carefully measured the surface roughness of Zerodur substrate using phase shift interferometer and atomic force microscope, and compared it with the scattering of the mirror. The absorption of the mirror was measured by cavity ring-down method, and its results were correlated to the thin film structure. To avoid the UV degradation which comes from the He-Ne plasma, we carefully select the mirror fabrication material, and design the high reflectance mirror. Finally, mirror was fabricated by ion beam sputtering method and its optical properties were measured.

关键词： super mirror ion beam sputtering super-polishing Zerodur loss roughness scattering UV degradation

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Method for determining individual element misalignments in optical systems

Method for determining individual element misalignments in o...

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conference on current developments in lens design and optical engineering XIII

作者： Oteo, Esther Diaz, J. A. Arasa, J. Tech Univ Catalonia Terrassa Spain

ISBN: (纸本)9780819492036

A new method for the misalignments calculation has been developed based in the analysis of the coefficients of the Zernike polynomial adjustment to the on-axis wavefront of the optical system. By means of a study of the system behavior in front of misalignments when they are small perturbations of position around the nominal value, it is shown that the Zernike coefficients behaviour can be aproximated with a polynomial. The coefficients of the Zernike polynomial are used to form a system of non-linear equations where the unknown variables are the misalignment values. This system of equations can be solved to find the misalignments values. The method has been validated by the simulation of a triplet where the second lens is misaligned. A series of misalignments of decentering and tilt have been applied and by simulation the wavefront have been obtained. Then the method has been used to calculate the misalignments from the wavefronts. Good results have been obtained for decentering and tilt separetely. With this process, the error of calculation for the tilt and the decentering has been obatined to be less than 20% for the simulated triplet system.

关键词： optical systems elements alignment misalignments Zernike Coefficients wavefront evaluation

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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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