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

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Optomechanical design of the incubator Wide Field of View Imaging Spectrometer

Optomechanical design of the incubator Wide Field of View Im...

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conference on current developments in Lens design and optical Systems engineering

作者： Haring, RE Vanstone, G Nguyen, F Rodil, C Orbital Sci Corp Pomona CA 91767 USA

ISBN: (纸本)0819437387

The optomechanical design of the Wide Field of View Imaging Spectrometer (WFIS) is presented. Developed under NASA's Instrument Incubator Program, the Incubator WFIS is a hyperspectral-imaging spectrometer covering a 120 degrees x .015 degrees field of view over a 360 nm to 1000 nm spectral range. The Incubator's mission is to demonstrate, via night aboard NASA's DC-8 Research Aircraft, new technology for earth science. The Incubator WFIS is designed specifically for observing the earth and earth's atmosphere for chemistry and aerosol studies. The optomechanical design couples an off-axis F/3 Schwarzschild telescope to a three element Offner Spectrometer using two unique anamorphic/aspheric field elements. The complete sensor, including a CCD detector and electronics, occupies a volume of approximately cubic shape measuring 25 cm on an edge. An off-axis optical system such as the incubator WFIS requires a multidisciplinary design approach. This paper emphasizes the importance that systems approach plays in optomechanical design. This is typified by the trades performed to establish the optimum design alternative for the optical metering structure to achieve the 0.010 nm wavelength stability (with a 0.005 nn goal) needed for the science mission.

关键词： hyperspectral imaging remote sensing

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current developments in Lens design and optical engineering Xiv

Current Developments in Lens Design and Optical Engineering ...

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conference on current developments in Lens design and optical engineering

ISBN: (纸本)9780819496911

The proceedings contain 37 papers. The topics discussed include: radiance limits of ceramic phosphors under high excitation fluxes;application of heterogeneous microlenses for solid state lighting;design of compact fisheye lens with slope-constrained Q-type aspheres;analytic formulas of the aspheric terms for convex-plano and plano-convex aspheric lenses;multi-core and GPU accelerated simulation of a radial star target imaged with equivalent T-number circular and Gaussian pupils;man versus machine: a lens design challenge;a 3D photographic capsule endoscope system with full field of view;double micro-prism array design for reducing dispersion on prism-based stereo camera system;optical architecture of the new generation infrared atmospheric sounder interferometer (IASI-NG);a three-channel miniaturized optical system for multi-resolution imaging;backward reflection analysis of transmitting channel of active laser ranging;and further results in measuring water ice buildup on optical components in cryogenic vacuum chambers.

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3-channel acousto-optic modulator for laser projection display system

3-channel acousto-optic modulator for laser projection displ...

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conference on current developments in optical design and engineering VII

作者： Kim, YH Park, JH Cha, SN Hwang, YM Samsung Adv Inst Technol Display Mat Lab Mat & Devices Sector Suwon 440600 South Korea

ISBN: (纸本)0819428841

A small laser projection display system is designed with a hybrid dichroic mirror for color separation, a hybrid dichroic mirror for color recombination, a 3-channel acousto-optic modulator(AOM) and a scanning part. The 3-channel AOM modulates red, green and blue laser breams. The wavelengths of red, green and blue beams are 647, 515 and 488 nm respectively. The carrier frequencies of each channel of AOM were adjusted to minimize the diffraction angle differences among red, green and blue laser beams. The carrier frequencies are 130, 168, 178 MHz for red, green and blue laser beams respectively. The measured diffraction angle after the carrier frequency control equals to the calculated diffraction angle. The transducer structure of AOM was optimized to get a high diffraction efficiency and to maximize isolation between adjacent channels by a slicing saw, which enhanced the electrical and acoustic isolation. The impedance matching-circuit of each electrode is housed in a separate compartment to suppress electrical crosstalk. The diffraction efficiency and risetime of the 3-channel AOM are over 85% and 50 nsec per each cell. The crosstalk between the channels is less than -30 dB.

关键词： 3-channel acousto-optic modulator hybrid dichroic mirrors laser projection display optical crosstalk electrical crosstalk

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Optics for binocular telescopes.

Optics for binocular telescopes.

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conference on current developments in Lens design and optical engineering II

作者： Rayces, JL Rosete-Aguilar, M J L Rayces Consuting Ltd Laguna Niguel CA 92677 USA

ISBN: (纸本)0819441554

Low power telescopes such as those used in pairs in binoculars do not have a reticle at the intermediate, real, image plane. Therefore there is no need to correct aberrations of the intermediate images as it is in pointing devices. Generally, in order to keep the telescope simple and short the Petzval sum is not corrected. In most cases the solution is to introduce astigmatism in the eyepiece. If it is permissible to use the accommodation of the eye as a degree of freedom then it is possible to remove the astigmatism over the entire field of view and yet to obtain ever better imagery. The final virtual anastigmatic images presented to the eye by the telescope are formed on a curved surface convex towards the observer's eye. The eye will be focused at a close distance for axial images and relaxed for the extreme off-axis images. Then the telescope is to be designed for different conjugate positions at different field angles. Furthermore the telescope is to be designed for different exit pupil locations at different field angles in order to minimize vignetting when the exit pupil is not sufficiently large, designing for different conjugate and pupil position at different field angles is almost always possible with most optical design codes using multiple configuration mode.

关键词： optical design telescopes binoculars eyepieces

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Low profile optic design for mobile camera using dual freeform reflective lenses

Low profile optic design for mobile camera using dual freefo...

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conference on current developments in Lens design and optical engineering VII

作者： Jeong, Ho-Seop Yoo, Ho-Sik Lee, Sang-Hyuk Oh, Hae-Ran Samsung Elect Mech Cent R&D Inst Opt Lab Suwon 443743 South Korea

ISBN: (纸本)0819463671

Aspherical glass or plastic lenses are usually adapted in the camera module of handheld phone. Recently, slimmer cameras are required according to reducing thickness of handheld phone. In this paper, we present an ultra slim camera module using multiple freeform off-axis imaging lenses. New optical concept of multiple lens system introduces the planar optics with freeform. shaped aspherical lens surface on the wafer, which can achieve the thickness of 50% compared to the conventional symmetric lens system. In order to achieve the resolution specification, we separate the field of view in camera module. As the result, two inverted images are produced on a same imaging sensor and the acquired inverted images are processed by photo stitching algorithm so as to combine them. Finally, in order to verify the new imaging system, we manufacture the new slim lens through the LJV embossing replication process. We found the new imaging system is feasible for VGA resolution and it can be expandable to the high resolution system.

关键词： freeform. surface planar integrated optics photo stitching wafer scale lens UV embossing

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System matrix generation for 3D tomographic reconstructions using an optical design software 19

System matrix generation for 3D tomographic reconstructions ...

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19th conference on current developments in Lens design and optical engineering

作者： Rilling, Madison Bourrassaa, Francois Archambault, Louis Thibault, Simon Univ Laval Dept Phys Genie Phys & Opt Quebec City PQ Canada Univ Laval Ctr Hosp Univ CHU Quebec Ctr Rech Quebec City PQ Canada Ctr Opt Photon & Laser Quebec City PQ Canada

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

3D imaging of solid targets using plenoptic cameras has been extensively explored and optimized over the years. Unfortunately, these imaging techniques, typically making use of triangulation methods and contrast recognition for depth estimation, lose their validity when imaging translucent media. For these cases, tomographic reconstruction has been shown to be a promising avenue for recovering the 3D shape of a translucent volume. Apart from the tomographic reconstruction algorithm itself, the accuracy of a reconstructed solution depends on the set of measured projections and on the system matrix. A proper determination of the system matrix is key as its elements describe the weighted contribution of a voxel in object space to one in image space;however, computing the matrix elements can consist of an arduous task as it requires a priori knowledge of the imaging system and precise modeling of the physical properties of the acquisition process. In this work, we present how an optical design software can be used to generate such system matrices. Compared with approximation methods involving paraxial ray tracing, the proposed method offers the main advantage of real ray tracing, in which the computed weighted contributions intrinsically account for optical aberrations in the imaging system. Physical properties of light propagation within the translucent medium can also be taken into account when using non-sequential modes. Using a ray tracing software thus offers great flexibility in designing plenoptic imaging systems used with 3D tomographic reconstruction techniques.

关键词： optical design software 3D tomographic reconstruction ray tracing ray tracing plenoptic camera translucent media 3D emission computed tomography

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Assembly of a micro-optical resonator based on silicon micro mirrors for use in gyroscopes 18

Assembly of a micro-optical resonator based on silicon micro...

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conference on current developments in Lens design and optical engineering XVIII

作者： Leber, I. Niesel, T. Werner, C. Yu, L. Flugge, J. Dietzel, A. TU Braunschweig Inst Mikrotech Alte Salzdahlumer Str 203 D-38124 Braunschweig Germany Phys Tech Bundesanstalt D-38116 Braunschweig Germany Harbin Inst Technol Ultraprecis Opt & Elect Instrument Engn Ctr Harbin 150001 Heilongjiang Peoples R China

ISBN: (纸本)9781510612082;9781510612075

For realization of a miniaturized optical gyroscope the precise assembly of optical micro components is crucial. To detect the rotation rate the laser beam must circulate many times and not leave the resonator due to small misalignments. The assembly of a passive free space triangular ring resonator in which the light can circulate by reflections at three mirrors is investigated. The beam path encloses an area of about 100 mm(2). The resonator shall be activated by an external light source at 1550 nm, a wavelength at which silicon is translucent and allowing to couple light into the resonator through the silicon mirrors. To utilize an inherent mirror alignment two of the mirrors are fabricated with a micro manufacturing process within the same crystal by wet etching resulting in very perfect {111} facets. The etching solution was optimized with respect to process time and smoothness of the mirror surfaces. To further increase the reflectivity of the mirrors different kinds of coatings are tested. With these two perfectly positioned mirrors the assembly challenge reduces to 3DOF alignment of a third {100} mirror for which a well-designed adjustable spacer is developed. In first tests resonance in a linear cavity test setup is demonstrated already.

关键词： silicon micro mirror optical resonator optical gyroscope optical alignment

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Optimizing trefoil phase plates design for color wavefront coding 19

Optimizing trefoil phase plates design for color wavefront c...

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19th conference on current developments in Lens design and optical engineering

作者： Olvera-Angeles, Miguel Padilla-Vivanco, Alfonso Ortega, Karina Sasian, Jose Schwiegerling, Jim Arines, Justo Acosta, Eva Univ Politecn Tulancingo Hidalgo 43629 Mexico Univ Arizona Coll Opt Sci Tucson AZ 85721 USA Univ Santiago de Compostela Fac Fis Santiago De Compostela 15782 Spain

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

Wavefront coding refers to the use of a phase modulating element in conjunction with deconvolution to extend the depth of focus of an imaging system. The coding element is an asymmetrical phase plate shape, for most applications in the form of a trefoil or a cubic polynomial. Phase plates with trefoil shape generate not only the desired amount of trefoil aberration but also spherical aberration. It has been recently shown that a wavefront coding based optical system shows high tolerance to spherical aberration for monochromatic images;however, the depth of focus is considerably shortened for color images. In this work, we will show how to modify the shape of a phase plate in order to optimize its performance for color imaging. The design parameters of the phase plate are obtained by minimizing a merit function by means of genetic algorithms developed for this purpose. The evaluation of the optical characteristics of the phase plates for a feedback with the optimization algorithm is obtained by Zemax. Results will be illustrated by numerical simulations of color images.

关键词： Wavefront coding spherical aberration color imaging optimization genetic algorithms

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Research on properties of an infrared imaging diffractive element 15

Research on properties of an infrared imaging diffractive el...

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conference on current developments in Lens design and optical engineering XV

作者： Rachon, M. Wegrzynska, K. Doch, M. Kolodziejczyk, A. Siemion, A. Suszek, J. Kakarenko, K. Sypek, M. Warsaw Univ Technol Fac Phys PL-00662 Warsaw Poland

ISBN: (纸本)9781628412192

Novel thermovision imaging systems having high efficiency require very sophisticated optical components. This paper describes the diffractive optical elements which are designed for the wavelengths between 8 and 14 mu m for the application in the FLIR cameras. In the current paper the authors present phase only diffractive elements manufactured in the etched gallium arsenide. Due to the simplicity of the manufacturing process only binary phase elements were designed and manufactured. Such solution exhibits huge chromatic aberration. Moreover, the performance of such elements is rather poor, which is caused by two factors. The first one is the limited diffraction efficiency (c.a. 40%) of binary phase structures. The second problem lies in the Fresnel losses coming from the reflection from the two surfaces (around 50%). Performance of this structures is limited and the imaging contrast is poor. However, such structures can be used for relatively cheap practical testing of the new ideas. For example this solution is sufficient for point spread function (PSF) measurements. Different diffractive elements were compared. The first one was the equivalent of the lens designed on the basis of the paraxial approximation. For the second designing process, the non-paraxial approach was used. It was due to the fact that f/# was equal to 1. For the non-paraxial designing the focal spot is smaller and better focused. Moreover, binary phase structures suffer from huge chromatic aberrations. Finally, it is presented that non-paraxially designed optical element imaging with extended depth of focus (light-sword) can suppress chromatic aberration and therefore it creates the image not only in the image plane.

关键词： infrared diffractive optics extended depth of focus Light Sword optical Element

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Electro-chromic device with GZO as a conductive layer

Electro-chromic device with GZO as a conductive layer

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

作者： Chan, Chih-Chao Tang, Chien-Jen Lee, Kun-Hsien Jaing, Cheng-Chung Kuo, Chien-Cheng Chen, Hsi-Chao Lee, Cheng-Chung Natl Cent Univ Thin Film Technol Ctr Dept Opt & Photon Chungli 320 Taiwan MingHusin Univ Sci & Technol Dept Appl Mat & Optoelect Engn Hsinchu Taiwan Natl Yunlin Univ Sci & Technol Grad Sch Optoelect Yunlin Taiwan

ISBN: (纸本)9780819482822

Thin films of tungsten oxide (WO3) were deposited on GZO-coated B270 glass substrates and thin films of Ta2O5 were deposited on B270 glass substrates by electron beam gun evaporation at high vacuum pressure of 3x10(-5) Torr and varied oxygen pressures ranging from 1.0x10(-4) to 6.0x10(-4) Torr. The optical properties of the electro-chromic (EC) film were measured by a spectrophotometer. The optical modulation (Delta T) of the tungsten oxide thin film deposited at an oxygen pressure of 1.0x10(-4) Torr was found to be Delta T = 67.46% at lambda=550nm. The optimum optical properties for deposition of Ta2O5 were attained at an oxygen pressure of 4x10(-4) Torr. Gallium doped zinc oxide (GZO) was used as a conductive layer instead of ITO. A five layer EC device (Glass/GZO/WO3/Ta2O5/NiO/Al) has been design and fabricated.

关键词： Electro-chromic devices transparent conducting oxide tungsten oxide optical modulation

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