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The design of an achromatic 1/4 wavelength retarder 6

The design of an achromatic 1/4 wavelength retarder

引用

current developments in optical design and engineering VI conference

作者： Chen, LY Wang, Y Zhou, SM Dai, N Zheng, YX Physics Department Fudan University Shanghai 200433 China

ISBN: (纸本)0819422517

In many optical experimental systems, an achromatic 1/4 wavelength retarder is needed to satisfy experiment condition. This can be fulfilled using a rhomb prism which has a nearly constant refractive index in the working wavelength range. To make the easy use of the prism in the optical system and to avoid the problem of central beam deviation, one type of the prism having three total internal reflection faces can be designed to have the total retarding angle equal to 90 degrees. Though the angle can be relativly easily calculated in principle, the size and optical opening window of the prism depend an the practical and optimum geometric design. In this paper, we will give a few examples of geometric design by taking different size parameters into consideration. We have made the prisms and put them into the application of measuring the magneto-optical Kerr ellipticity with success. Detailed calculation and error reduction in the design are also given.

关键词： optical retarder optical rhomb prism

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optical design for a visible through thermal infrared multi-band imaging system 6

Optical design for a visible through thermal infrared multi-...

引用

current developments in optical design and engineering VI conference

作者： Shu, KL Henson, T Hughes Danbury Optical Systems Inc. (United States) Sandia National Labs. (United States)

ISBN: (纸本)0819422517

The optical design and the expected performances of a multi-band imaging system will be presented The instrument is to be operated in a low earth orbit in a pushbroom scanning mode. It has 15 spectral bands with the wavelength range extending from 0.45 mu m to 10.7 mu m. The instrument comprises a single mechanically cooled focal plane, a 36 cm aperture, wide field of view off-axis three mirror anastigmatic telescope, and an on-board calibration subsystem. The design has near diffraction limited performance for ail spectral bands from visible to long wavelength infrared (LR). It has high throughput and low polarization sensitivity. To minimize the background noise at long wavelength infrared (LWIR) a cold stop is located at the exit pupil to achieve 100% cold shielding.

关键词： Long wavelength infrared optical design Staring arrays Wavefronts Calibration Imaging systems Mirrors Short wave infrared radiation Mid-IR Visible radiation

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Afocal attachment to a conical optical beam deflector insensitive to motor wobble 6

Afocal attachment to a conical optical beam deflector insens...

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current developments in optical design and engineering VI conference

作者： Shimoji, M California State Univ./Chico (United States)

ISBN: (纸本)0819422517

An afocal optical system designed to be attached to a conical optical beam deflector is discussed The conical beam deflector generates a collimated optical beam that rotates along a cone-shaped trajectory in space. This output beam is then fed to the afocal attachment, a telescope, designed to tailor the beam characteristics to suit a particular application. For many applications, the afocal attachment functions as a beam expander and modifies three characteristics of the input beam. First, it expands the input beam diameter to an acceptable level. Then, it inevitably reduces the apex cone angle of the beam due to the inherent property of a telescope. Third, the stationary plane, the plane where the apex of the cone resides, is magnified and transferred to the conjugate image plane.

关键词： conical optical beam deflector beam expander laser beam scanning circular scan line refractive scanner

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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 filters on board the Space Telescope Imaging Spectrograph (STIS) 6

Optical filters on board the Space Telescope Imaging Spectro...

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current developments in optical design and engineering VI conference

作者： Coffelt, E Martella, M Ball Aerospace and Technologies Corp. (United States)

ISBN: (纸本)0819422517

The Space Telescope Imaging Spectrograph (STIS) instrument is due to be installed on board the Hubble Space Telescope (HST) in 1997. STIS uses 20 filters located on a wheel that can rotate any one of 88 apertures or combination filter/aperture into the beam path. The instrument incorporates a continuous range of spectral response from the VUV (115.0 nm) to 1 um. Therefore, filters that perform in the VUV are discussed as well as filters that operate in the near infrared. Neutral density filters are also being used for on-board calibration from 300 nm to Lyman-Alpha (121.6 nm).

关键词： Hubble Space Telescope neutral density Bandpass filters VUV Lyman-Alpha

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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...

引用

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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Confocal scanning optical microscope with circular scan line 6

Confocal scanning optical microscope with circular scan line

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current developments in optical design and engineering VI conference

作者： Shimoji, M California State Univ./Chico (United States)

ISBN: (纸本)0819422517

A reflected-light confocal scanning optical microscope with circular scan line is described. For the horizontal scanning, the instrument uses a rotating dispersive prism embedded at the tip of a hollow motor shaft. The rotating hollow motor shaft accepts a polarized collimated laser beam and transforms it into a rotating beam, with a cone-shaped trajectory, on its exit from the prism. The rotating beam then passes through an inverted telescope and a quarter-wave plate before it is focused onto the specimen plane by a conventional microscope objective. To improve upon the ranging accuracy, a telecentric scan is maintained throughout the scan. The reflected light travels back through the same components until it is redirected by a beam splitter to pass through an analyzer and a pinhole before arriving at the detector. The use of the same optics for both illumination and imaging automatically satisfies the confocal requirement, and eliminates the need for a synchronizing mechanism. Also, the use of a rotating prism renders the system completely insensitive (for all practical purposes) to motor wobble.

关键词： confocal microscope conical optical deflector circular scan line refractive scanner telecentric scan

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Study on adjustable displacement parallel beamsplitter 6

Study on adjustable displacement parallel beamsplitter

引用

current developments in optical design and engineering VI conference

作者： Xu, FY Yan, WL Chi, ZT Department of Basic Courses Shandong Architectural Engineering Institute Jinan Shandong 250014 China Department of Physics Qingdao University Qingdao Shandong 266071 China

ISBN: (纸本)0819422517

Beamsplitter is one kind of optical element or apparatus which change one light beam into two or more light beams, and it has been widely used in optical technique. We have ever introduced a series ordinary beamsplitter made by using birefringent crystal. In this article we will introduce a series new type beamsplitter, that is adjustable displacement parallel beamsplitter. We can change one light beam into two parallel light beams, and the displacement between the two parallel light beams can be adjusted by using this type beamsplitter. According to the property of the two parallel light beams, the beamspliter can be divided into two kinds. The first dind, the two light beams both are polarization light beams;the second kind, the two light beams both are nonpolarization light beams. We have discussed their structure character, working principle and using specification in this article.

关键词： beamsplitter parallel light beam birefringent crystal

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