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

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design of the hybrid refraction-diffraction lens with wavelength 10.6 mu m 6

Design of the hybrid refraction-diffraction lens with wavele...

引用

current developments in optical design and engineering VI Conference

作者： Chen, YS Li, DH Institute of Physics Chinese Academy of Sciences Beijing 100080 China

ISBN: (纸本)0819422517

In this paper, combining refractive and diffractive effects, a new kind of infrared lenses with wavelength 10.6 mu m was designed and produced for CO2 laser material processing. This refractive-diffractive lens (RDL) converts a CO2 laser beam into the rectangular shape with light intensity distribution in the concave shape at x-direction. A method which employs input aperture division and geometrical transformation technique for obtaining a better initial phase distribution of the iteration is presented. The experimental results show that the desired shape of the output light beam was obtained with a high efficiency in energy utilization.

关键词： binary optics diffractive optics infrared lens design

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optical properties of large area diffractive Fresnel-lenses with modified zone-geometry 6

Optical properties of large area diffractive Fresnel-lenses ...

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current developments in optical design and engineering VI Conference

作者： Zeitner, UD Kley, EB Friedrich-Schiller-Univ. Jena (Germany)

ISBN: (纸本)0819422517

A special surface geometry of diffractive Fresnel-lenses, which is well adapted to the kartesian working regime of most microlithographic machines, is presented in this paper. Due to this adaption the amount of data neccessary for the description of the exposure and also the exposure-time decreases drastically and so the realization of large area diffractive lenses and lens-arrays became possible. In this paper we compare the modified lens-geometry with the common radially symmetrical diffractive Fresnel-lens and we show some experimental results which we obtained for a lens realized by electron-beam lithography.

关键词： Fresnel-lens micro lithography electron-beam lithography

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design of an in-vivo microscope to characterize cataracts in human eyes 6

Design of an in-vivo microscope to characterize cataracts in...

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current developments in optical design and engineering VI Conference

作者： Feng, C Ahmad, A Univ. of Alabama in Huntsville (United States)

ISBN: (纸本)0819422517

The design of a compact contact microscope, which can be used in-vivo to study the cataracts in human eyes is presented. This microscope has the capability to evaluate the changes in the optical density within the eye lens itself, and thus enabling an examiner to ascertain the progression of a cataractous change or at least the optical changes associated with cataractous development. The microscope has a variable focal length so it can be focused at any depth through the entire thickness of the eye lens. A separate small objective lens is spring loaded against the cornea (like a tonometer tip) so that the natural eye movements can occur safely during the examination. The distance between the objective lens and rest of the optics is variable to accommodate the movements of the eye due to pulse or breathing without affecting the image quality of the instrument. The layer by layer images can be captured on a CCD camera and stored in the computer. The reconstruction software can quantitatively display the characteristics of the cataracts, such as the location, size, and density. The optical design and performance results for the microscope are presented. The optomechanical design features of the microscope are also discussed.

关键词： in-vivo microscope contact microscope eye diseases cataracts CCD imaging

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The impact of zonal irregularity on infrared lens performance 6

The impact of zonal irregularity on infrared lens performanc...

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current developments in optical design and engineering VI Conference

作者： Sinclair, RL Wescam Inc 45 Innovation Drive Flamborough L9H 7L8 ON Canada

ISBN: (纸本)0819422517

High performance infrared optical designs require careful tolerancing to ensure that the as built performance meets the system requirements. Using modem optical design programs a wide variety of single element and group tolerances can be defined and statistical analysis employed to formulate a prediction of the as built performance. When the number of units being produced is small or near diffraction limited performance is required, then a worst case analysis is often employed to generate a more accurate prediction. However, in some situations, such as low F/number lenses, certain effects that may be important are not always adequately addressed by first order tolerance analysis. This paper reviews one such effect;zonal irregularity or slope errors. To quantify the impact of zonal irregularity on the MTF performance of an infrared lens, detailed comparisons are made between measured and predicted performance. Interferometric analysis of the lens element irregularity is incorporated within the design to predict the as built lens line spread function.

关键词： infrared lens optical tolerances interferograms

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current developments in optical design and engineering VI

Current Developments in Optical Design and Engineering VI

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current developments in optical design and engineering VI 1996

The proceedings contain 53 papers. The topics discussed include: development of a three-channel SWIR camera, for ground-based astronomical imaging. (two micron all sky survey, 2MASS);evaluation of a demonstration telescope for the pluto express mission;impact of zonal irregularity and refractive index errors on infrared lens performance;optical performance budget for the far ultraviolet spectroscopic explorer;compact prism-based optics for two-axis gimbal systems allowing large aperture and field of regard;using wavefront sensor information in image post-processing to improve the resolution of telescopes with small aberrations;scanning near-field infrared microscope with a free electron laser illumination source;infrared incoherent imaging: elements of rotary encoder optical design;and dry resist technology to fabricate optimized microlenses centered to the end of a monomode fiber with electron-beam lithography.

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Development of a three-channel SWIR camera, for ground-based astronomical imaging. Two Micron All Sky Survey, 2MASS 6

Development of a three-channel SWIR camera, for ground-based...

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current developments in optical design and engineering VI Conference

作者： Milligan, S Cranton, BW Skrutskie, MF Telic Optics Inc. (United States) Univ. of Massachusetts/Amherst (United States)

ISBN: (纸本)0819422517

The Two Micron All Sky Survey (2MASS) project, currently underway, requires a camera mated to a 1.3 meter Cassegrain telescope that will simultaneously image the J, H and Ks spectral bands onto three separate NICMOS3 HgCdTe detector arrays. Dichroic beamsplitters allow the three FPA's to view the same field simultaneously. This paper reviews the development of this camera, presents a detailed analysis of the optical design, and discusses the techniques used to align the instrument and evaluate its performance. The low irradiance of astronomical sources, combined with background limited performance of the detectors, mandated a reimaging configuration and the enclosure of the camera optics within the cold volume. Correcting chromatic aberrations, and minimizing ghost images were additional challenges imposed by program requirements. The key to achieving high performance was found to be the selection of lens materials. The final F/3.5 optical design uses fifteen CaF2 elements and four Infrasil elements in an all-spherical configuration. The design is diffraction limited over the full format in the Ks spectral band, and is nearly so in the J and H bands. The tolerance environment is benign, making the design well suited for use in a cryogenic environment. A single channel prototype has been built and extensively field tested at the 50-inch telescope at Kitt Peak National Observatory. Each channel in the multi-spectral camera uses the same optical design successfully demonstrated in the prototype. currently, the first of two three-channel cameras is undergoing lab tests for image quality and channel registration.

关键词： near infrared optical design astronomical imaging chromatic aberration cryogenic camera 2MASS sky survey

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Diamond-turned diffractive optical elements for the infrared: suggestion for specification standardization and manufacturing remarks

Diamond-turned diffractive optical elements for the infrared...

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current developments in optical design and engineering V

作者： Riedl, Max J. OFC Corp. Marlborough MA USA

ISBN: (纸本)0819418994

Diffractive optical elements (DOEs) have found their acceptance in lens design as an additional tool to refractive and reflective elements. They are especially powerful for applications in the infrared spectrum, because many of the materials, suitable for transmission in this region, lend themselves exceptionally well to the correction of chromatic aberration. The phase profile of the grating superimposed onto the base surface of an IR lens is relatively coarse. This makes it economically advantageous to apply the single point diamond-turning process to the direct generation of such phase profiles. Different ways have been used to describe the profile of a DOE, which have in some cases led to costly misunderstandings. To provide some clarification and suggest a form of standardization for the specifications call-out in manufacturing documents is the primary purpose of this paper. Additional comments are being presented as guidelines and for better understanding of the advantages and limitations for applications of diffractive optical elements in general, and of diamond-turned elements in particular.

关键词： Diffraction gratings

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design of laser focusing system for laser-microbeam instrument

Design of laser focusing system for laser-microbeam instrume...

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current developments in optical design and engineering V

作者： Zhu, Yanbin Ma, Junfu South China Normal Univ. Guangzhou Guangdong China

ISBN: (纸本)0819418994

Recently the laser microbeam instrument has been used for wider applications in biological science and medicine. A key problem of the laser microbeam instrument is designing the laser focusing system for getting a focal spot size of less than 1 micrometer. This paper presents a new laser focusing system which is composed of a spatial filter and an 80× focusing objective lens. The 80× focusing objective lens was designed as a double reflective sphere type. Using this focusing system, the laser microbeam instrument has gotten a focal spot size of less than 0.5 - 1 micrometer. The focal spot size depends on the pinhole diaphragm diameter of the spatial filter. Different pinhole diaphragm diameters could produce different focal spots that are given in the end of this paper.

关键词： optical instruments

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Eight-level programmable binary optics system using cascaded ferroelectric liquid crystal spatial light modulators

Eight-level programmable binary optics system using cascaded...

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current developments in optical design and engineering V

作者： Broomfield, Seth E. Neil, Mark A. Paige, Edward G. Univ. of Oxford Oxford UK

ISBN: (纸本)0819418994

We present a novel method for producing arbitrary valued, binary phase-only modulation from a commercially available ferroelectric liquid crystal spatial light modulator (FLCSLM) used in conjunction with simple polarization components. Three such stages can be cascaded together in an instrument capable of producing up to eight discrete, equally spaced levels of phase modulation. By using 128 by 128 pixel FLCSLMs a reconfigurable, pixellated, eight-level, optical phase modulator has been constructed which we refer to here as a programmable phase transformer (PPT). We report on the near diffraction limited performance of such an instrument when stopped down to 64 by 64 pixels in producing simple diffraction patterns and when used to generate asymmetric spot arrays in the Fourier plane of a lens. We also discuss the limitations of the current system and the projected improvements that will result from current and future developments in device technology and modulation schemes.

关键词： optical systems

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Athermalized color correction in glass-liquid optical systems

Athermalized color correction in glass-liquid optical system...

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current developments in optical design and engineering V

作者： Abramov, Alexander P. Petrova, Maria V. Tolstoy, Michael N. Robb, Paul N. Sigler, Robert D. S.I. Vavilov State Optical Inst. St. Petersburg Russia

ISBN: (纸本)0819418994

The incorporation of abnormal dispersion liquids into an optical design can result in significant performance advantages. However, the large thermal coefficient of refractive index which is common to all liquids (dn/dT) can complicate the athermalization of these designs. One method is to use two different liquids to form both positive and negative liquid lens elements which balance each other thermally while maintaining color correction. The success of this approach is dependent on the proper selection of materials, and on a detailed knowledge of the wavelength dependence of the refractive index thermal coefficients. The thermal dependence of refractive index and dispersion in the visible spectral region for a number of liquids was investigated. A correlation between the refractive index thermal coefficient (dn/dT) and abnormal dispersion was found to exist in a majority of liquids. The optical property measurements were made at the Vavilov State optical Institute, St. Petersburg, Russia in collaboration with the Lockheed Palo Alto Research Laboratory, Palo Alto, California.

关键词： optical systems

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