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

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Aberrations of perturbed and unobscured optical systems

Aberrations of perturbed and unobscured optical systems

引用

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

作者： Agurok, I Phys Opt Corp Torrance CA 90505 USA

ISBN: (纸本)0819432652

The double expansion of the wavefront deformation in Zernike polynomials over the pupil and the field-of-view coordinates is a powerful tool for lens design, testing, and alignment. It provides a compact description of the wavefront deformation of perturbed and unobscued optical systems over the field-of-view. The integral of the mean-square wavefront deformation over the field-of-view is simply the sum of the products of the norms of the polynomials and the squared global coefficients. Eight or ten global coefficients can provide a comprehensive centered system description. Only fourteen main additional global coefficients is sufficient for the description of perturbed and unobscured optical systems.

关键词： double expansion of wavefront deformation perturbed and unobscured systems

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Using a two-lens afocal compensator for thermal defocus correction of catadioptric system 18

Using a two-lens afocal compensator for thermal defocus corr...

引用

conference on current developments in lens design and optical engineering XVIII

作者： Ivanov, S. E. Romanova, G. E. Bakholdin, A. V. St Petersburg Natl Res Univ Informat Technol Mech 49 Kronverksky Prospekt St Petersburg 197101 Russia

ISBN: (纸本)9781510612082;9781510612075

The work associates with the catadioptric systems with two-component afocal achromatic compensator. The most catadioptric systems with afocal compensator have the power mirror part and the correctional lens part. The correctional lens part can be in parallel, in convergent beam or in both. One of the problems of such systems design is the thermal defocus by reason of the thermal aberration and the housing thermal expansion. We introduce the technique of thermal defocus compensation by choosing the optical material of the afocal compensator components. The components should be made from the optical materials with thermo-optical characteristics so after temperature changing the compensator should become non-afocal with the optical power enough to compensate the image plane thermal shift. Abbe numbers of the components should also have certain values for correction chromatic aberrations that reduces essentially the applicable optical materials quantity. The catalogues of the most vendors of optical materials in visible spectral range are studied for the purpose of finding the suitable couples for the technique. As a result, the advantages and possibilities of the plastic materials application in combination with optical glasses are shown. The examples of the optical design are given.

关键词： Afocal compensator athermalization catadioptric system optical material

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Development of fast camera objective for spectrograph of Mont Megantique telescope

Development of fast camera objective for spectrograph of Mon...

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conference on current developments in lens design and optical engineering V

作者： Thibault, S Wang, M Bernier, S INO Opt Design Grp St Foy G1P 4S4 PQ Canada

ISBN: (纸本)0819454613

A fast (F/1.55) and wide-angle refractive camera objective has been developed to work with a large-size CCD on the focal plane of the spectrograph of Mont Megantique telescope for large spectral coverage from UV to VIS and up to NIR. The novel camera objective has been designed and optimized with three different glass combinations in order to have higher throughputs for large spectral coverage, especially in UV region. The tolerance analysis of the camera objective is given in the paper. The final opto-mechanical design of the objective is discussed with the consideration of the manufacturing tolerance in the optical and mechanical parts, as given in this paper. The used components have been minimized to reduce the light inherent lost. The optical testing results displayed the good optical performance of the camera with the required resolution for the whole FOV, as predicted by the optical simulation and computation. The broadband AR coating, enhanced on UV region, have been used on each surface of the lenses in the optical system.

关键词： optical engineering fast spectrograph camera opto-mechanical design astronomical instrumentation

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Employment of fluorescence for autofocusing in direct laser writing micro-/nano-lithography 15

Employment of fluorescence for autofocusing in direct laser ...

引用

conference on current developments in lens design and optical engineering XV

作者： Malinauskas, Mangirdas Zukauskas, Albertas Belazaras, Kastytis Vilnius Univ Fac Phys Dept Quantum Elect Laser Res Ctr LT-10223 Vilnius Lithuania

ISBN: (纸本)9781628412192

Herein we present the implementation of autofocusing in multi-photon Direct Laser Writing (DLW) lithography. It is based on fluorescence occurring within the confined volume of a photopolymer/photoresin excitation resulting to a voxel generation. The proposed method is further successfully employed for the nanofabrication of large scale (500 nm in height, up to 25 mm(2) in area) Diffractive optical Elements (DOE). The produced structures are characterized using Scanning Electron Microscope (SEM) and confocal optical profilometry. The introduced technique is potential for a simple, price and effort efficient upgrade of currently existing DLW micro-/nano-lithography setups.

关键词： Direct laser writing femsosecond pulses two-photon polymerization multi-photon excitation nanolitography autofucusing photopolymers diffractive optical elements

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design of a free-form lens system for short distance projection

Design of a free-form lens system for short distance project...

引用

conference on current developments in lens design and optical engineering XII/Advances in Thin Film Coatings VII

作者： Yang, Bo Lu, Kan Zhang, Wei Dai, Fujian Shanghai Univ Sci & Technol Shanghai Key Lab Contemporary Opt Syst Sch Opt Elect & Comp Engn Shanghai 200093 Peoples R China Zhejiang Sunny Opt Co Ltd R&D Dept Yuyao 315400 Zhejiang Peoples R China

ISBN: (纸本)9780819487384

A free-form lens system design is proposed for short distance projection. Free-form surface shape and non-rotational symmetrical structure provide us more freedoms for optimization. The catadioptric structure is also used to reduce the overall length of the whole system. The designed projector lens system consists of two parts. The first part is a rotationally symmetrical lens system which corrects the basic aberrations. The second part contains a free-form lens and a reflector which correct the distortion and other aberrations. We achieve 55inch projected image size at a display screen which is 300mm away from the lens system. The maximum distortion for all fields at all distances is less than 3%.

关键词： optical engine Projection lens Free-form Catadioptric Least-square fitting

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Nonimaging Achromatic lens design for LED Direct-lit Backlight Applications 15

Nonimaging Achromatic Lens Design for LED Direct-lit Backlig...

引用

conference on current developments in lens design and optical engineering XV

作者： Tsai, Meng-Che Chen, Bo-Song Lee, Tsung-Xian Natl Taiwan Univ Sci & Technol Grad Inst Appl Sci & Technol 43Sec 4Keelung Rd Taipei 106 Taiwan Natl Taiwan Univ Sci & Technol Grad Inst Color & Illuminat Technol Taipei 106 Taiwan

ISBN: (纸本)9781628412192

Nowadays, light emitting diodes (LEDs) have been widely used in backlight module for display technology. Most of researches tend to improve optical performance in specific applications, such as sufficient efficiency, desired intensity distribution and high illuminance uniformity. However, most of phosphor converted white LEDs have the problem of inducing impure white light. The undesired phenomenon of yellow ring or blue ring becomes more serious through incorrect secondary optical design. In this paper, we emphasize on enhancing the spatial color and illuminance uniformity of LED direct-lit backlight using nonimaging achromatic lens design. We propose a new design method to re-distribute and uniform the ratio of blue and yellow light on the target surface. Moreover, we further apply it in direct-lit LED backlight lens design, in which the uniformity of illuminance on the out coupling surface can be as much as 83.7% and the color uniformity (Delta u'v') is improved to 0.0039. Therefore, the result of high color and illumination uniformity can be achieved simultaneously.

关键词： LED direct-lit backlight Achromatic lens design Illuminance uniformity Color uniformity

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Estimating the factors restricting potential dynamic range in the optical scheme of acousto-optical spectrometer for the Mexican Large Millimeter Telescope

Estimating the factors restricting potential dynamic range i...

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conference on current developments in lens design and optical engineering VIII

作者： Shcherbakov, Alexandre S. Mata, Sandra E. Balderas Lucero, D. Sanchez Natl Inst Astrophys Opt & Elect AP 51 & 216 Puebla 72000 Mexico

ISBN: (纸本)9780819468154

Here, we consider one of the most important problems related to optimizing the performance data of a new acousto-optical spectrometer for the analysis of radio-astronomical signals. The main attention is paid to estimating two factors governing the dynamic range of that spectrometer. At first, we determine the influence of the acoustic attenuation along a large-aperture acousto-optical cell on potential levels of lobes in focal plane of the integrating lens and then describe capabilities of the incident light beam apodization for increasing the dynamic range of spectrometer. These studies lie in a line with the program of developing metrological equipment for Mexican Large Millimeter Telescope.

关键词： acousto-optics dynamic range large-aperture acousto-optical cell acoustic attenuation beam apodization

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design and development of bi-directional Viewer

Design and development of bi-directional Viewer

引用

conference on current developments in lens design and optical engineering XIII

作者： Yu, Zong-Ru Ho, Cheng-Fang Liu, Annie Lee, Tai-Wen Lin, Wen-Lung Hsu, Wei-Yao Natl Appl Res Labs Instrument Technol Res Ctr Hsinchu 300 Taiwan

ISBN: (纸本)9780819492036

Bi-directional viewer just likes a lens of camera. Unlike conventional camera lens, the bi-directional viewer captures not only front view but also side view around the bi-directional viewer. The barrel of bi-directional viewer was designed to have cuts in the side to allow side light to come through, and we use two aspherical mirrors to receive and change the side light to converge on the main optical path. The front view and side view can be imaged simultaneously on an image sensor. Commercial aspherized achromatic lens and micro video lens were also used to keep the image quality and miniaturize the size of the bi-directional viewer respectively. We report on the development of bi-directional viewer, including optical design, optical simulation, optomechanics design, fabrication techniques, assembly procedure and performance testing. The MTF of the bi-directional viewer is also measured and discussed in this paper. We successfully design and realize a bi-directional viewer, which can perform 100 lp/mm spatial frequency image in detail above 20% contrast in the 7.6 mm front view area. And we keep the dimensions of this device within 35 mm in total length and phi 20 mm in diameter.

关键词： Bi-directional viewer Side view MTF Catadioptric Dual-view

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New infrared optical systems using diffractive optics

New infrared optical systems using diffractive optics

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conference on current developments in lens design and optical engineering III

作者： Bigwood, C Thales Opt Ltd St Asaph LL17 0LL Denbigh Wales

ISBN: (纸本)0819445347

A method for computing the polychromatic MTF of hybrid refractive - diffractive elements is described taking into consideration the effects of not only the primary diffraction order but also the effects of additional parasitic diffraction orders. The results of this approach are compared with the more conventional single order calculation and with actual measured performance. For certain markets and applications the cost of infrared lenses are critical in order to achieve customer expectations. Two possible methods of realising this requirement are the use of moulded optics or the use of multiple kinoform optics with no refractive power. Examples of such lenses are given along with discussion of the merits and limitations that each approach entails.

关键词： optical design infrared diffractive optics

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Cryogenic lens design Case Study: Gemini Planet Imager Spectrograph

Cryogenic Lens Design Case Study: Gemini Planet Imager Spect...

引用

conference on current developments in lens design and optical engineering XII/Advances in Thin Film Coatings VII

作者： Thibault, S. Univ Laval Dept Phys Quebec City PQ G1V 0A6 Canada

ISBN: (纸本)9780819487384

Making a lens design working at cryogenic temperature is a real challenge. Both optical and mechanical designer must work together to prevent problems during operation. The Gemini Planet Imager (GPI), currently under construction will be a facility instrument for the 8-m Gemini South telescope. The science instrument is a cryogenic integral field spectrograph based on a lenslet array. The integral field nature of the instrument allows for a full mapping of the focal plane at coarse spectral resolution. With such a data cube, artifacts within the PSF such as residual speckles can be suppressed. Additionally, the initial detection of any candidate planet will include spectral information that can be used to distinguish it from a background object: candidates can be followed up with detailed spectroscopic observations. The optics between the lenslet array and the detector are essentially a standard spectrograph with a collimating set of lenses, a dispersive prism and a camera set of lenses in a folded assembly. This paper describes the process from the first preliminary design to the final cryogenic system for both optical and mechanical design to achieve cryogenic working solution. We also discussed the assembly procedure (room temperature vs cryogenic compensation), the test support equipments and finally the laboratory optical performances over the field of view.

关键词： Planet imager cryogenic spectrograph test image quality

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