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检索条件"任意字段=8th Conference on Current Developments in Optical Design and Optical Engineering"

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optical design of a visible and infrared survey telescope for astronomy

Optical design of a visible and infrared survey telescope fo...

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

作者： Atad-Ettedgui, E Casali, M Hawarden, TG Henry, DM Worswick, SP Royal Observ UK Astron Technol Ctr Edinburgh EH9 3HJ Midlothian Scotland

ISBN: (纸本)0819432652

A number of preliminary optical designs for a new generation of 4 metre astronomical survey telescopes have been investigated. these have large fields of view and operate in both the visible and near IR astronomical wavebands. Typical requirements for dual band systems of this type are presented. Two designs for prime focus refractive field corrector systems are presented, with and without aspheric surfaces. the use of aspheric surfaces on the field corrector lenses is shown to allow a large field of view (2 degrees diameter) to be achieved. A design for a three mirror reflective system is presented which also allows a 2 degrees field to be achieved. An infrared imager, based on a modified Schmidt camera, is presented which allows a 1 degrees field of view to be achieved. Additionally, a modified Ritchey-Chretien telescope, incorporating refracting field corrector lenses is presented. this design provides a large field of view over both the visible and lR wavebands. the mechanical constraints of combining these systems into dual channel systems are also discussed.

关键词： wide field astronomy survey telescope optical designs visible and infrared

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Full field mapping and analysis of veiling glare sources for Helmet Mounted Display systems

Full field mapping and analysis of veiling glare sources for...

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

作者： Hasenauer, DM Kunick, JM Opt Res Associates Pasadena CA 91107 USA

ISBN: (纸本)0819432652

the performance of an optical system can be degraded by the intrusion of stray light from sources both inside and outside of the system field of view. Stray light, or "veiling glare," can be particularly distracting in visual systems such as Helmet Mounted Display (HMD) systems. this paper describes techniques used by the authors to map stray light source positions in the far field for HMD systems and to quantitatively define their impact. the mapping can be performed over 4 pi steradians (i.e., over a full sphere) both inside and outside the system field of view. Monte-Carlo ray tracing algorithms are utilized for determining an effective source intensity distribution across the entire far field and a subtractive technique is utilized that separates the veiling glare component from the desired optical signal component. Once the major veiling glare source positions are identified, methods to reduce veiling glare can be determined. A technique for reducing noise in the calculation due to the statistical nature of the Monte Carlo ray trace is also discussed.

关键词： optical design illumination stray radiation stray light veiling glare LightTools (R)

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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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Segmented illumination lenses for steplighting and wall-washing

Segmented illumination lenses for steplighting and wall-wash...

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

作者： Parkyn, WA Teledyne Lighting and Display Products Inc. (United States)

ISBN: (纸本)0819432652

Many illumination situations involve a flat surface and an oblique luminaire placement. Today's commercially available luminaires give very uneven illumination here. A novel injection-moldable segmented lens is presented that will uniformly illuminate a rectangular zone, such as a stair-step or a picture on a wall. Its design is a development of prior methods(1) of lens-surface generation that derived the array of surface normal vectors required to match a source with a particular illumination prescription. this matching is done via grids on the unit sphere: one for the source and one for the prescription. the cells of these two grids are sized so that they have the same flux of lumens, according to the source intensity and the prescribed illumination, respectively. the first development is the use of an equi-flux polar grid for the target rectangle, because most light sources have circular symmetry. the second development is the radial segmentation of the lens surface in order to approximate the non-irrotational array of surface normal vectors derived from the two grids. designs are presented for step-lighting by LEDs and fiber-optic billboard lighting.

关键词： Light emitting diodes Lenses Light sources and illumination optical spheres Lens design Fiber optics Optics manufacturing Reflectors Light sources Refractive index

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design of a day/night star camera system

Design of a day/night star camera system

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

作者： Alexander, CD Swift, W Ghosh, K Ramsey, B NASA George C Marshall Space Flight Ctr Dept Space Sci Huntsville AL 35812 USA

ISBN: (纸本)0819432652

this paper describes the design of a camera system capable of acquiring stars during both the day and night cycles of a high altitude balloon flight (35-42 km). the camera system will be filtered to operate in the R and I bands (similar to 600-1000nm), and simulations have been run using MODTRAN atmospheric code to determine the worse case sky brightness at 35km. With a worse case daytime sky brightness of 2x10(-5) W/cm(2)/sr/mu m at 600nm, the sensitivity of the camera system will allow acquisition of at least 1-2 stars/degrees(2) at star magnitude limits of 7.8-8.1. the system will have an F2.8, 64.3mm diameter lens and a 1340 x 1037 CCD digitized to 12 bits. the CCD is comprised of 6.8 mu m x 6.8 mu m pixels with a well depth of 45,000 electrons and quantum efficiency of 0.54 at 700nm. the camera's field-of-view will be 6.33 degrees(2) and provide attitude knowledge to 8 arcsec or better. A test flight of the system is scheduled for fall 1999.

关键词： star camera aspect system stratospheric balloon flights daytime star camera R band

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design verifications of a linear laser encoder with high head-to-scale tolerance

Design verifications of a linear laser encoder with high hea...

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

作者： Wu, CC Chen, YC Lee, CK Hsieh, CT Wu, WJ Lu, SS Natl Taiwan Univ Inst Engn Mech Taipei 10764 Taiwan

ISBN: (纸本)0819432652

Laser encoders overcome the fundamental resolution limit of geometrical optical encoders by cleverly converting the diffraction limit to phase coded information so as to facilitate nanometer displacement measurement. As positioning information was coded within the optical wavefront of laser encoders, interferometry principle thus must be adopted within the design of the laser encoders. this effect has posed a very strong alignment tolerance among various components of the whole laser encoder, which in turn impose a serious user adaptation bottleneck. Out of all alignment tolerance, the head-to-scale alignment tolerance represents the most important hindrance for wider applications. Improving the IBM laser optical encoder design by taking into the consideration of manufacturing tolerance of various optical components, an innovative linear laser encoder with very high head-to-scale tolerance is presented in this article. Efficiency of the TE/TM incident Light beams on the grating scale used are examined theoretically and verified experimentally so as to provide design optimizations of the grating scale. Effect of various grating scales, quartz master or polymer-based grating replicate, is also detailed. Signal processing used to decode the quadrature based positioning optical signal is also studied. Experimental results that verify the resolutions of the tabletop laser encoder prototype by comparing the decoded quadrature signal and a HP laser interferometer output signal is also presented.

关键词： laser encoder alignment tolerance alignment tooling diffractive grating diffractive encoder

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Agile beam director system design (ROBS/TCATS optical tracker)

Agile beam director system design (ROBS/TCATS optical tracke...

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

作者： Neff, BW Trissel, RG Dunn, M Scotese, L Thermotrex Corp San Diego CA 92121 USA

ISBN: (纸本)0819432652

the ROBS (Rapid optical Beam Steering) tracking telescope was invented and developed at TTC to provide a high acceleration, large aperture beam steering system for rapid pointing to multiple objects. the optical system consists of a fast, oversized spherical primary mirror with the 50 cm aperture stop at the center of curvature of the primary mirror (CCP). A lightweight secondary mirror selects the instantaneous field of view by scanning over the petzval image surface of the primary mirror. the secondary mirror is gimbaled about the CCP on a rigid, lightweight mast. the system's symmetry about the CCP simplifies the optical and mechanical design and provides very rapid retargeting over a 30 degree field of regard for multiple target tracking. Field corrector and pupil relay optics inside the support tube collimate the light through coude' optics to passive sensors and laser radar optics. the 2-sphere, 2-asphere aplanatic, anastigmant all-reflective design corrects the 9.1 mr of spherical aberration from the F/1 primary and provides 10 microradian resolution over a 5 mr field of view. the system incorporates near field focus adjustment to provide high resolution imaging and laser ranging over a large volume of space. Two 50 cm systems have been built and demonstrated tracking multiple targets in the field. this paper describes the opto-mechanical design and demonstrated system capabilities.

关键词： telescope with spherical primary beam steering laser radar system optical tracker

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Spatio-temporal structures of laser-induced anisotropy and applications

Spatio-temporal structures of laser-induced anisotropy and a...

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

作者： Chen, X Berger, H Chaux, R Univ Bourgogne Phys Lab F-21078 Dijon France

ISBN: (纸本)0819432652

We report new observations of optical spatio-temporal structures formed in a naturally isotropic solid-state material. the phenomenon is due to laser-induced anisotropy. In fact, a part of the optical power is absorbed by the material which leads to the sample heating, the refractive index of the medium becomes laser power dependent under strong beam intensity excitation. this refractive index variation modifies in turn the optical polarization of the beam. As a consequence a polarization pattern is induced. If the material is placed near the laser beam focus, usually the induced depolarization is strong due to the high beam intensity. We observed however, that the induced depolarization is reduced sharply near the focus. this phenomenon was not observed up to now. We have developed a model which shows that both the index variations in transverse and longitudinal directions contribute to the phase shift, and are responsible for the depolarization As a result, the competition between these two contributions plays a key role in the polarization changes near focus. Our observation is accounted for by a transient nonlinear refractive index model. Good agreement with the theoretical description of the pattern formation is obtained. We found that in some appropriated experimental configurations, these spatio-temporal structures present advantages in the applications, e.g. in conceiving a two dimensional vectorial optical sensor.

关键词： optical pattern application spatio-temporal structure anisotropy

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High power 0.98 μm broad waveguide lasers using novel material system of InGaAs/InGaAsP/AlGaAs

High power 0.98 μm broad waveguide lasers using novel mater...

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

作者： Yang, GW Hwu, RJ Chern, JH Xu, ZT Xu, JY Univ Utah Dept Elect Engn Salt Lake City UT 84112 USA

ISBN: (纸本)0819432652

We describe the theoretical design and experimental fabrication of high power 0.98 mu m strained quantum well lasers employing broad waveguide structure and novel hybrid material system of Al-free InGaAs/InGaAsP active region and AlGaAs cladding layers. the use of AlGaAs cladding, instead of InGaP, provides advantages in flexibility of laser structure design, simple epitaxial growth, improvement of surface morphology and laser performance. In addition to the theoretical study of the new structure, we successfully demonstrate the design by obtaining high performance laser devices. the as-grown InGaAs/InGaAsP/AlGaAs laser material exhibits very high quality with low threshold current density of 200 A/cm(2) (at a cavity length of 800 mu m), high internal quantum efficiency of similar to 93%, and low internal loss of 1.2 cm(-1). For 100 Gun-wide stripe lasers with cavity length of 800 mu m, a high slope efficiency of 1.03 W/A, low vertical beam divergence of 36 degrees, high output power of 3.65 W, and very high characteristic temperature coefficient (T-0) of 250 K are achieved.

关键词： semiconductor lasers optical structure design semiconductor epitaxial layers quantum well lasers semiconductor materials thin films

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optical design of ARIES: the new near infrared science instrument for the adaptive f/15 Multiple Mirror Telescope

Optical design of ARIES: the new near infrared science instr...

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

作者： Sarlot, RJ McCarthy, DW Burge, JH Ge, J Univ Arizona Steward Observ Tucson AZ 85721 USA

ISBN: (纸本)0819432652

Steward Observatory is building a deformable f/15 secondary mirror that will compensate for atmospheric turbulence for the 6.5 m Multiple Mirror Telescope conversion. With the proposed adaptive optics system, this new telescope is expected to resolve diffraction limited images (greater than 80% Strehl ratio at 2.2 mu m), approximately an order of magnitude better than present seeing. this improved visibility with a larger fight collecting area and low thermal background requires a new science instrument, diffraction limited for the 1 to 5 mu m region. this science instrument, presently in its early manufacturing stages, consists of four cameras (optimized for plate scales from 0.019 arcsec/pixel to 0.102 arcsec/pixel), low resolution spectroscopy with grisms (lambda/Delta lambda from 250 to 500), high resolution spectroscopy with a cross-dispersed Echelle grating (lambda/Delta lambda from 3,000 to 60,000) and an atmospheric dispersion corrector. the cameras will provide simultaneous slit viewing, differential imaging and two pixel sampling over the full wavelength band. Each camera will operate with a 1024x1024 HgCdTe array optimized for the spectral region of the camera. An infrared tip/tilt sensor is also incorporated into the instrument that will relay natural guide star motion to the adaptive secondary in a closed-loop approach. this paper is an optical design instrument overview.

关键词： adaptive optics infrared camera spectrograph atmospheric dispersion corrector MMT

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