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

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optical system design for excimer laser materials processing

Optical system design for excimer laser materials processing

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

作者： Unnebrink, L Henning, T Kreutz, EW Poprawe, R Rhein Westfal TH Aachen Lehrstuhl Lasertech D-52074 Aachen Germany

ISBN: (纸本)0819432652

Non-imaging integrators which can be used for laser beam homogenization in materials processing with excimer laser radiation are analysed with regards to geometrical and statistical optics. A model for the transversal degree of coherence of the laser radiation is presented in order to estimate the performance of the integrating devices for the partially coherent excimer laser radiation. This is necessary for a more relevant design of those elements than a design by geometric optical means only. The concept of non-imaging integrators is enhanced by separating the multifaceted element from the focusing lens. This separation provides more flexibility in the processing distance of the optical system. A further enhancement is the combination of such a system with an imaging lens in order to create a system which produces a top hat fluence distribution with variable size for materials processing applications.

关键词： excimer laser non-rotationally symmetric optical elements beam homogenization materials processing multifaceted beam integrators transversal degree of coherence

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Combining the transformation and the integration methods to design a refractive lens-array for signal lighting applications 18

Combining the transformation and the integration methods to ...

引用

conference on current developments in lens design and optical engineering XVIII

作者： Essameldin, Mahmoud Fleischmann, Friedrich Henning, Thomas Lang, Walter Bremen Univ Appl Sci Fac Elect Engn & Comp Sci 30 Neustadtswall D-28199 Bremen Germany Univ Bremen Inst Microsensors Actuators & Syst Otto Hahn AlleeGebaude NW 1 D-28359 Bremen Germany

ISBN: (纸本)9781510612082;9781510612075

The design of a secondary optical lens for light beam shaping using the transformation method is performed by transforming the light source energy distribution using the concepts of energy conservation and light energy mapping. Using these concepts creates a dependency relation between the output optical performance and the luminous intensity distribution of the light source. This relation leads to errors on the optical performance due to the fabrication misalignment between the light source and the secondary optical lens. On the other hand, in the illumination applications, the integration method has been proved to be an efficient method for achieving a high degree of homogenized luminous intensity distribution by integrating and superimposing the light source energy over the illuminated objects. In signal lighting applications, the luminous intensity distribution must meet the requirements regarding the brightness perception of users over the spatial angular distribution, not the illumination of objects. In this paper, the integration method is combined with the transformation method to design a refractive lens-array for signal lighting applications. The difference between the two methods is described, presenting the advantages of the combination process. design procedures are explained in detail including the lens-array modeling. The optical performance is investigated using an optical ray tracing. Finally, the influence of the misalignment between the light source and the refractive lens-array is measured.

关键词： optical design Signal Lighting Beam-shaping

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The design, Construction and Characterization of a Solid Elastic lens

The Design, Construction and Characterization of a Solid Ela...

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conference on current developments in lens design and optical engineering IX

作者： Santiago-Alvarado, A. Vazquez-Montiel, S. Iturbide-Jimenez, F. Arriaga-Martinez, R. Gonzalez-Garcia, J. UTM Inst Fis & Matemat Carretera Acatlima Km 2-5 Huajuapan Leon Oaxaca Mexico City 6900 DF Mexico INAOE Inst Opt Santa Maria Tonantzintla Pu Mexico UTM Inst Diseno Mexico City 6900 DF Mexico

ISBN: (纸本)9780819472809

Recent times have seen the production of normal and micro liquid lenses with variable focal length. These have been specially made with transparent elastic materials and liquid medium between them, or with a dielectric liquid medium inside the cavity. Change in the volume of the liquid medium, in the first case, or the application of an electric field as in the second, produced a change in the optical parameters of the lens. The present study offers the opto-mechanical design, manufacture and characterization of a solid elastic lens made of Polydimethylsiloxane (PDMS). To do so, we have prepared a mechanical support frame to hold all of the components of the lens and also allow for the application of radial stress on its periphery. In order to ensure a well-finished lens surface a high quality optical glass mold has also been constructed. Finally, we will present an analysis of the properties of this type of lens when it undergoes variations of radial stress. The experimental results are presented.

关键词： Adaptive lens Opto-mechanical design Elastic lens

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Procedures for speeding up the exact evaluation of diffraction integrals by semiperiodic-zone division of the integration domain

Procedures for speeding up the exact evaluation of diffracti...

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conference on current developments in lens design and optical engineering V

作者： Ferré-Borrull, J Bosch, S Dept Engn Elect Elect & Automat E-43007 Tarragona Spain

ISBN: (纸本)0819454613

We develop a method for the calculation of the integrals arising in the diffraction theory of aberrations. This method is developed from in a previous one based in the division of the diffracting aperture in semiperiodic zones, which enabled the exact calculation of the Point-Spread Function of an optical system. By a careful analysis of the integration process and of the properties of the semiperiodic zones, we develop a set of formulae that give an approximate value of the result of the diffraction integrals. This permits to avoid the numerical calculation of the integrals, which is a computationally intensive procedure and enables a substantial reduction of the computation times. The method has been tested on aberration-free optical systems and real optical systems and has shown a good accuracy, although some minor problems require further investigation.

关键词： point-spread function diffraction theory of aberrations optical system evaluation calculation methods

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The importance of Petzval correction in generalized Offner designs 11

The importance of Petzval correction in generalized Offner d...

引用

conference on current developments in lens design and optical engineering XXI

作者： Rogers, John R. Rakich, Andrew Synopsys Inc 199 S Los Ro Bles Ave Pasadena CA 91101 USA Mersenne Opt Consulting 41 Rimu Rd Raumati Beach 5032 Paraparaumu New Zealand

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

In this paper we examine the third-order aberrations of the "generalized Offner" family of designs comprising three concentric mirrors, with the first and third mirrors being not necessarily identical in radius and including the possibility that the object might be displaced from the common centers of curvature. We develop analytic expressions relating the first-order and third-order properties of the system to the radii of the three mirrors and to the object distance. Although one might expect a ring-field system to be relatively tolerant of field curvature, we show that the Petzval Sum affects the other aberrations in an extraordinary manner.

关键词： lens design aberration theory monocentric concentric

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Accuracy and sensitivity analysis of the conical null-screen based corneal topographer 17

Accuracy and sensitivity analysis of the conical null-screen...

引用

conference on current developments in lens design and optical engineering XVII

作者： Cossio-Guerrero, Cesar Campos-Garcia, Manuel Univ Nacl Autonoma Mexico Ctr Ciencias Aplicadas & Desarrollo Tecnol Mexico Apdo Postal 70-186 Mexico City 04510 DF Mexico

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

In every optical testing method, the time taken to process data, the precision of the results and the sensitivity are among the most relevant aspects to be taken into account when the viability of its implementation is been under consideration. An accuracy and sensitivity analysis of a topographer based on a conical null-screen with a semi-radial distribution of targets is presented. On the other hand, we proposed a custom evaluation algorithm in order to reduce the time in the calculation of the normal to the corneal surface. Finally, we perform some corneal topographical measurements.

关键词： Null-Screen optical Metrology Corneal Topography

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An endoscopic lens with internal focusing 23

An endoscopic lens with internal focusing

引用

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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Mechanical fabrication of precision microlenses on optical fiber endfaces

Mechanical fabrication of precision microlenses on optical f...

引用

conference on current developments in lens design and optical engineering V

作者： Milton, G Gharbia, Y Katupitiya, J Univ New S Wales Sch Mech & Mfg Engn Sydney NSW 2052 Australia

ISBN: (纸本)0819454613

We present a purely mechanical means of producing highly concentric spherical lenses at the endfaces of optical fibers. The production process has two stages. First, conical lenses are produced in a grinding process that ensures excellent concentricity. Then, the conical lenses are transformed to spherical lenses using a novel process called loose abrasive blasting. The cone grinding is carried out on a microgrinding machine, which has a sophisticated control system that enables the production of precision conical lenses. The blasting is carried out on a diamond blasting machine. Plots showing automatic centering performance of the microgrinding machine and scanning electron microscopy images of the conical and spherical lenses are presented. (c) 2005 Society of Photo-optical Instrumentation Engineers.

关键词： microlens optical fiber endface cone grinding

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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...

引用

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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A hardware-based simulation platform for optical design and engineering

A hardware-based simulation platform for optical design and ...

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conference on current developments in lens design and optical engineering VII

作者： Ortiz, Fernando E. Durbano, James P. Sharkawy, Ahmed S. Shi, Shouyuan Curt, Petersen F. EM Photon 51 E Main StSuite 203 Newark DE 19711 USA

ISBN: (纸本)0819463671

optical lenses and systems have historically been of interest to the design and simulation community due to their extensive use in a variety of applications, including telecommunications and imaging. To simulate these systems, it is often possible to take advantage of symmetry or apply physical approximations, such as ray tracing and/or beam propagation, in order to avoid a rigorous solution of Maxwell's equations. However, in cases where these techniques are not applicable, such as when feature sizes become comparable to the wavelength of interest, full-wave electromagnetic simulations are required. Unfortunately, the time constraints and simulation sizes associated with many designs render this analysis infeasible or impractical, a problem that is aggravated by iterative design flows. Hence, a numerical platform capable of handling such computationally intense problems is necessary. In this paper, we present a hardware-based, full-wave simulation platform and demonstrate the advantages of hardware acceleration for the simulation of optical applications. Specifically, we will present a diffractive optical element (DOE) lens simulation, comparing results with previously published analytic and experimental data. We then modify the basic lens arrangement to produce an optical beam splitter. Because such a device cannot be analytically described using symmetry, this example will demonstrate the unique advantages of powerful hardware solvers for the analysis of DOE applications. Finally, we discuss how hardware-based solvers are critical for iterative designs by means of a 1-to-3 beam splitter example. This simulation system represents a new era in optical engineering, enabling the design of next-generation devices today.

关键词： optics lens DOE splitter design hardware simulation FDTD FPGA acceleration

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