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

共 468 条记录，以下是431-440 订阅

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optical tiling for wide field-of-view head-mounted displays

Optical tiling for wide field-of-view head-mounted displays

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

作者： Hoppe, MJ Melzer, JE Kaiser Electroopt Inc Display Syst Engn Dept Carlsbad CA USA

ISBN: (纸本)0819432652

The design of a wide field-of-view head-mounted display (HMD) is very challenging. Unfortunately, traditional design methods produce low-resolution imagery that is unacceptable for some tasks. One method of addressing this challenge is to optically tile several smaller field-of-view displays to form a single, wide field-of-view, high-resolution image. This paper will address design issues specific to optically tiled systems including optical performance, seam placement and binocular rivalry.

关键词： optical tiling head-mounted display HMD wide field-of-view VIM (R) optical collimator

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optical design of high aperture compact relay systems

Optical design of high aperture compact relay systems

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

作者： Nikolov, ID Univ Sofia Opt & Spect Dept BG-1126 Sofia Bulgaria

ISBN: (纸本)0819432652

Some results obtained in the realization of compact relay systems design are presented. Four optical configurations have been analyzed. Two symmetrical schemes were examined having field Smith's lenses for a image scaling of-ix. The achieved numerical aperture is up to 0.35 and the MTFs curves are at 40 cycles1/mm for a contrast ratio of 0.2. The third design has a large field of 40 mm but its F-number is about F/4.5. The last relay system is unsymmetrical. The scaling is 2x and the image field exceeds 50 mm. The aberration balancing results and the optical systems performance are illustrated.

关键词： optical design relay systems high-speed optics wide-angle lenses

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optical design of the Hobby-Eberly Telescope Four Mirror Spherical Aberration Corrector

Optical design of the Hobby-Eberly Telescope Four Mirror Sph...

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

作者： Jungquist, RK Eastman Kodak Co Commercial & Govt Syst Div Rochester NY 14650 USA

ISBN: (纸本)0819432652

The Hobby-Eberly Telescope uses a ii-meter diameter F/1.45 segmented spherical primary mirror. A spherical mirror of this size generates large amounts of spherical aberration. To be used successfully in a tilted optical Arecibo type telescope, the spherical aberration needs to be corrected. This means that tracking of astronomical targets is achieved through moving a tracker optical package which imposes somewhat severe packaging constraints. Given these packaging constraints, novel methods must be employed to correct the aberrations with the Spherical Aberration Corrector contained in the moving hacker optical package. The paper reviews the pertinent requirements, constraints and the resultant design of the Hobby-Eberly Telescope Four Mirror Spherical Aberration Corrector.

关键词： telescope design four mirror spherical aberration

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Stray light design and analysis of SIRTF CTA

Stray light design and analysis of SIRTF CTA

引用

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

作者： Fleming, JC Ball Aerosp & Technol Corp Boulder CO 80306 USA

ISBN: (纸本)0819432652

Ball Aerospace is building the Cryogenic Telescope Assembly (CTA) for the Space InfraRed Telescope Facility (SIRTF) project and stray light control is a critical part of this effort. The heliocentric orbit where the Sun is never allowed to illuminate the CTA and the Earth is relatively far away is a key feature for stray light control. Mirror and paint BRDFs were measured at various SIRTF wavelengths in order to provide inputs for the stray light models. Stray light from telescope self emission, a distant point source, and the galaxy were analyzed. The design ensures that stray light will be less than 21% of the celestial background at all SIRTF wavelengths.

关键词： SIRTF stray light scatter thermal emission diffraction

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optical design for Terrestrial Planet Finder

Optical design for Terrestrial Planet Finder

引用

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

作者： Noecker, MC Leitch, J Kopp, G McComas, B Ball Aerosp & Technol Corp Boulder CO 80306 USA

ISBN: (纸本)0819432652

We describe the features of the optical system for Terrestrial Planet Finder, a space-based, cryogenic (35 K) interferometer for direct detection of Earth-type planets around nearby stars. Destructive interference in a stellar interferometer suppresses stellar glare by a factor of several thousand or more, and phase chopping distinguishes planet light from symmetric backgrounds. The mid-infrared (7-20 mu m) is favorable for detecting planetary emission relative to that from the star, and this spectral region also offers important molecular signatures indicative of key atmospheric gases.

关键词： Planets Interferometers Mirrors Nulling interferometry Stars Space telescopes Telescopes Space operations Beam splitters Sensors

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EFFECTS of optical feedback on the filamentation and mode control of broad-area semiconductor lasers

EFFECTS of optical feedback on the filamentation and mode co...

引用

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

作者： Xu, W Wang, XD Gwynn, RB Worlock, JM Hwu, RJ Univ Utah Dept Elect Engn Salt Lake City UT 84112 USA

ISBN: (纸本)0819432652

In this work, modeling along with associate experiments of the broad-area laser with an external optical cavity which employs a mode-selecting mirror has been conducted to study the effects of optical feedback on the filamentation and mode control of broad-area semiconductor lasers. By using split-step FFT algorithm in a propagation model, mode profiles of the broad-area lasers with a spherical cavity are simulated in detail, the simulation results agree very well with experimental measurements and verify the validity of the simulation model. Mode control of broad-area semiconductor lasers has also been studies through employing the same simulation model and associates experiments have also been conducted. The results will be presented in this paper.

关键词： broad-area semiconductor lasers optical feedback filamentation mode control

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design constraints of high-bit-rate soliton communication systems

Design constraints of high-bit-rate soliton communication sy...

引用

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

作者： Ferreira, MFS Univ Aveiro Dept Phys P-3800 Aveiro Portugal

ISBN: (纸本)0819432652

We have examined the main constraints on the design of single-channel, high-capacity soliton communication systems. Ln the average soliton regime, the Gordon-Haus timing jitter limits the bit rate to less than 7 Gb/s for transoceanic fiber links, while for shorter transmission distances the main limitation is fiber perturbations arising from discrete in-line amplification. The use of dispersion-decreasing fibers and of periodic optical, phase conjugation for jitter control can increase significantly the capacity of soliton communication systems. We found that the third-order dispersion assumes a prominent role in this case. Reducing this effect sufficiently, the main constraint becomes the soliton-soliton interactions and bit rates superior to 110 Gb/s can be achieved for amplifier spacings less than 80 km. For higher amplifier spacings the bit rate is limited by the Raman induced timing jitter.

关键词： optical solitons optical communication systems nonlinear fiber optics

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Dispersion sensitivity of large scale axial gradient index glass for spherochromat doublets

Dispersion sensitivity of large scale axial gradient index g...

引用

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

作者： Manhart, PK Hunter, BV Blankenbecler, R Raytheon Missile Syst Co Tucson AZ 85734 USA

ISBN: (纸本)0819432652

Bi-AGRIN cemented doublets, super corrected for zero axial color, spherical aberration and sphero-chromatism (we will call them spherochromats) can show polychromatic performance in the range of 0.004 waves PV or better at the red and blue wavelengths for speeds up to F/2, (0.06 waves PV of F/1.5). These doublets are comprised of two elements of axial gradient index glass. The crown and flint elements are each designed with separate and distinct gradient glass lines, giving each element an axial gradient in refractive index and dispersion(1). This paper examines one design and its performance sensitivity to dispersion modeling via the Buchdahl and Sellmeier dispersion equations.

关键词： optical design gradient index gradient dispersion macro AGRIN large scale AGRIN GRADIUM glass lines spherochromat high performance axial color sphero-chromatism

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Progress report on the optical system for closed-loop testing of the multiple mirror telescope adaptive secondary mirror

Progress report on the optical system for closed-loop testin...

引用

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

作者： Sarlot, RJ Bresloff, CJ Burge, JH Fitz-Patrick, BC McGuire, PC Stamper, BL Zhao, CY Univ Arizona Steward Observ Tucson AZ 85721 USA

ISBN: (纸本)0819432652

Steward Observatory is completing the manufacture of a deformable f/15 secondary mirror for the 6.5m Multiple Mirror Telescope conversion that will, along with the wavefront sensing system, compensate for atmospheric turbulence. A potential difficulty of an adaptive secondary mirror is the ability to verify the commanded mirror shapes of a large convex deformable surface. An optical design is presently being implemented to test the deformable mirror's closed loop control system by optically projecting an artificial star to simulate starlight in the actual telescope. The test system has been designed to verify the control system by fitting into both a laboratory test structure as well as the telescope support structure itself. The optical design relies on two wavelength computer generated holograms used to remove spherical aberration as well as aid in the alignment of the test system optics by projecting alignment patterns.

关键词： adaptive secondary aspheric testing Multiple Mirror Telescope Shimmulator

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optical microscope for nuclear emulsion readout -: system design and results in application

Optical microscope for nuclear emulsion readout -: system de...

引用

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

作者： Winkler, K Körner, L Gussek, P Balogh, I Breitfelder, S Schlichting, J Dupraz, JP Fabre, JP Panman, J Papadopoulos, IM Zucchelli, P Van de Vyver, B Syst GmbH Opt JENOPTIK Laser Jena Germany

ISBN: (纸本)0819432652

Experiments such as CHORUS at CERN require the inspection of a large amount of nuclear emulsion plates exposed to particle beams. Rare events need to be found, measured and analysed. Their features are stored as grains in microscopic dimensions in a three-dimensional stack of plates. A new, fully automatic immersion microscope system was developed for this purpose. It features high resolution, small depth of focus, large working distance, large field of view and synchronization of illumination and detector. An additional requirement is given by variations in the refraction index and in the relative thickness of immersion oil and emulsion. The approach used here is an imaging system based on a vario objective lens (variable oil immersion) with extreme numerical aperture, large working distance and wide field, combined with a matched high-aperture Koehler illuminator. The light source is a mercury are lamp, combined with a filter package for the g-line. It includes liquid crystal elements for synchronized shuttering and variable attenuation. The theoretical resolution is less than 1 micron in x, y, z within a volume of 0.5mm diameter (x, y) times 1 mm scanning depth (z) in all situations within a predefined index range (1.49 to 1.54). Three identical pieces of the system have been built. The experimentally measured resolution confirms the expectations and is better than 1 micron in all three dimensions. This is the result of a complex process of system design and manufacturing, unifying optical, opto-mechanical and optoelectronical contributions. This process spans from the early stages of feasibility and manufacturing up to the test and adjustment procedures. The three prototypes are operational since the fall of 1998 in the frame of the CHORUS project. Practical experience and application results are presented.

关键词： optical microscopy oil immersion nuclear emulsion readout variable immersion systems design

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