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

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A compact and cost effective design for cell phone zoom lens

A compact and cost effective design for cell phone zoom lens

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conference on current developments in Lens design and optical engineering VIII

作者： Chang, Chir-Weei Wu, Ching-Chin Ind Technol Res Inst Elect & Optoelect Res Labs 195Sec 4Chung Hsing Rd Hsinchu 310 Taiwan EFUN Technol Co Ltd Tainan 70955 Taiwan

ISBN: (纸本)9780819468154

A compact zoom lens design for cell phone is presented. A three groups lens system with five lens element is designed for cell phone camera with 3M pixels and 2.5 similar to 3X optical zoom. The first lens is a negative lens with a concave surface facing the object so that, when used for a long focal length, the rear principle plane is moved forwards to shorten the total length of the lens. A positive lens group composed of three lens elements is arranged at the second lens group. By control the optical power of the second lens group, the distortion can be reduced and also shortens the moving distance of the second lens group while zooming. The fifth lens in the third lens group is a positive lens to control the incident angle entering the photosensitive element. It is used for focusing when the object distance has changed.

关键词： zoom lens cell phone total track length

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Single-point diamond turning of lead indium phosphate glass 6

Single-point diamond turning of lead indium phosphate glass

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current developments in optical design and engineering VI conference

作者： Allison, SW Cunningham, JP Rajic, S Boatner, LA Sales, BC Oak Ridge National Lab. (United States)

ISBN: (纸本)0819422517

The development of the ability to routinely ''machine'' glass materials to optical tolerances is highly desirable and, in particular, could provide new degrees of control over the precise shape of complex and unusual optical surfaces. Of particular interest in this regard is the formation of non-spherical shapes where there is a need to fabricate both inexpensive, low-precision optics as well as specialized high-precision aspheric components. This work describes the initial feasibility tests of the machining of a new type of glass, lead indium phosphate (LIP), a material which transmits from the visible to 2.8 mu m (for thin samples). Glossy surfaces were produced with a root-mean-square surface roughness of less than 100 nm (with 200 mu m filter). The results indicate that this approach offers the potential for producing high-quality aspheric optical shapes based on the use of LIP glass.

关键词： optics fabrication optical materials asphere lead indium phosphate

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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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Linear wavelength spectrometer

Linear wavelength spectrometer

引用

conference on current developments in Lens design and optical engineering II

作者： Thibault, S INO Opt Engn Div St Foy PQ G1P 4S4 Canada

ISBN: (纸本)0819441554

Generally, a spectrometer uses a diffraction grating to spread the spectral components of a light incident on the diffraction grating on a one-dimensional detector. The detector is composed of pixels linearly distributed along a line. However, the diffracted light is not spread linearly on the detector which means that the Wavelength on pixel I is not linearly correlated with the wavelength on pixel 2. The resolution is therefore not constant for all the spectral range of the spectrometer. To know which pixel corresponds to which wavelength, a nonlinear calibration process must be applied to get a linear relation between the diffracted light position and the wavelength of this light. The new spectrometer that we present uses a special lens configuration name F-sin(theta) lens to provide a linear relation in the image plane between the pixel position and the wavelength of the light. The f-sin(theta) characteristic is defined as the difference in percent between the design position of the wavelength in the image plane and its ideal position, if the lens is perfect. The characteristic of the lens used in the spectrometer is better than 0.1%. The concept can also be used for WDM and DWDM applications.

关键词： spectrometer WDM DWDM distortion optical design guided optics

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A Laser Pumping Double-Light-Source Module with Photon-Recycling 20

A Laser Pumping Double-Light-Source Module with Photon-Recyc...

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conference on current developments in Lens design and optical engineering XX

作者： Lin, Shih-Kang Su, Yu-Wen Lee, Xuan-Hao Yu, Yeh-Wei Yang, Tsung-Hsun Sun, Ching-Cherng Natl Cent Univ Dept Opt & Photon Chungli 32001 Taiwan Feng Chia Univ Dept Opt & Photon Taichung 40724 Taiwan

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

We proposed a novel structure to perform photon recycling for a double-light-source illumination system pumped by a laser. In the design, two kinds of phosphor are located at the two focus of an elliptical reflective surface separately, after the phosphor on the first focus pumped by laser, the backward scattering light will refocus at the other phosphor layer at the second focus. The absorption spectrum of the second phosphor should fit that of the emission light by the first phosphor. When the emission spectrum covers red light, the whole system is a double-light-source module.

关键词： laser diode photon recycling head lamp optical design

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design of off-axial Gregory telescope design with freeform mirror corrector 18

Design of off-axial Gregory telescope design with freeform m...

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conference on current developments in Lens design and optical engineering XVIII

作者： Bazhanov, Yu. Vlakhko, V. Corp Precis Syst & Instruments 53 Aviamotornaya Str Moscow 111024 Russia Dynaoptics 8 Boon Lay Way Singapore 609964 Singapore

ISBN: (纸本)9781510612082;9781510612075

In this paper a well-known approach is used for calculation of off-axis three-mirror telescope. It includes usage of conic cross-sections properties, each of the sections forming a stigmatic image. To create a compact optical system, a flat mirror aberration corrector is introduced, which is at later stage transformed into a free-form surface in order to compensate field aberrations. Similarly, one can introduce such a corrector in finalized layout for its further optimization and getting a suitable form, including the conversion of multimirrors axial optical system into decentered one. As an example, off-axial Gregory telescope embodiment is used for infrared waveband region, due to the fact that, unlike the Cassegrain telescope, it provides a real exit pupil, and usage of the mirror corrector brings several advantages. Firstly, this feature may be used to include cold stop or adaptive mirror in the exit pupil, wherein corrector is introduced into a converging beam before the focus of the first mirror. Secondly, when placing corrector in the exit pupil of the optical system it is possible to eliminate high and low order aberrations of center point, which in turn improves optical system f-number, and minimize field aberrations. As another example, off-axial Ritchey-Chretien telescope embodiment is used as a good fit for visible region systems. Analysis and calculation results of optical systems with free-form correctors with surfaces, defined by Power polynomial series are presented in this paper. Advantages of different freeform surfaces usage depends on optical system layouts specifics.

关键词： Mirrors Telescopes Aberration theory Infrared telescopes Lens design Image analysis Infrared radiation optical design optical instrument design Telescope design

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Fiber-optical system for visualization of inner pipe defects by microrobot.

Fiber-optical system for visualization of inner pipe defects...

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conference on current developments in Lens design and optical engineering V

作者： Gradetsky, V Krabchuk, L Kniazkov, M Solovtsov, V Tulaikova, T Simakova, M Russian Acad Sci Inst Prob Mech Moscow 119526 Russia

ISBN: (纸本)0819454613

The control systems of the miniature robots are suggested for their motion over internal surfaces inside of the small diameter tubes. The mechanical system information-measuring sensor and control systems are considered. Three versions of the mechanical systems are suggested: electromagnetic, triad wheels and conversion of rotation motion to translation one. The electromagnetic mechanism use push pull tipe method for translation motion realization. Developed schemes in the modules design of control systems were checked experimentally on the robot's prototypes. Some results of the computer simulation illustrate the multilink robot control motion along the internal diameters of the tubes. This work was fulfilled under financial support of the Russian Found of Fundamental researches N 01-01-00913 and in frames of Federal Multi Purpose Scientific and Technical Program of Ministry of Industry, Science and Technologies: "Researches and developments on priority directions of science and technology", "Knowledgeable basic investigations" block, "Basic investigations at the field of physics sciences" part Mechanics.

关键词： minirobot in-tube motion mechanical system control algorithms on-board microprocessor control schemes

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design of ergonomic handpieces for a CO₂ laser system for surgical and cosmetological applications 19

Design of ergonomic handpieces for a CO<sub>2</sub> laser sy...

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19th conference on current developments in Lens design and optical engineering

作者： Zavatskaia, Kseniia Voznesenskaya, Anna ITMO Univ Dept Appl & Comp Opt St Petersburg Russia

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

The CO2 laser systems are widely used for different specialised surgery types and cosmetological procedures. The market is filled with various offers regarding the systems, however, every manufacturer supplies a very limited range of handpieces with the equipment. Thus, the work of surgeon or a medical worker is complicated by the discrepancy of a handpiece with the ergonomic/ technical requirements for a specific procedure. It may result in negative consequences of the procedure itself or a choice not in favor of laser technologies. The work presents the design of optical system and construction of specialised handpieces for CO2 laser system based on the discussion with medical workers of several hospitals that directly interact with the equipment and the technical requirements of medical procedures.

关键词： CO2 laser handpiece laser surgery optical design

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PHASE QUANTIZATION AND DISCRETIZATION IN DIFFRACTivE OPTICS

PHASE QUANTIZATION AND DISCRETIZATION IN DIFFRACTIVE OPTICS

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CONF ON current developments IN optical engineering 4

作者： GOLUB, MA SISAKJAN, IN SOIFER, VA Central Design Institute of Un (Israel) Central Design Institute of Un (Russia) Central Design Institute of Unique Instrumentation (Russia)

ISBN: (纸本)0819403954

Theoretical description of phase discretization and quantization is provided for coaputer generated optical eleients (CGOK). Suitable estiiations of seanaquared and iaxiaui aberrations, Strehl nuaber and aean wavefront deviation are derived in dependence of discretization and quantization paraieters. A diffractive aberration corrector for thin len5 and also phase diffractive coipensator for aspheric wavefront foriation are investigated as exasples, 1 . PROBLEM OF CGOE D ISCRETI ZAT ION AND QUANTI ZAT ION. Wide-range possibilities of coaputer generated holograis and optical eleients1' are soietiies liiited by discretization of their phase transfer function. The known aethods for studying phase nonlinearities treat quantization as a superposition of iany diffraction orders but do not take discretization into account. In this paper coibined studying of discretization and quantization is perforied for siooth phase functions such as of zoned phase plates, coipensators, Fresnel lenses and siiilar type CGOK. Digital holography applications provide us coiputer generated optical elesents including kinoforis' with purely phase-type t'ransfer function r (t) exp{***25rrrt (p(a)] (1) where • : (u,v) are 2-D Cartesian coordinates in the CGOI's plane, 'f (ii) is the phase shift perforied in point IT, iod2,,,tf ) is the value of 'p the aodulo (2ira), 1:1 or another positive nuiber. Coiputer-aided design of CGOK includes calculation of digital saiples for 'P function brought to [O,2%a) interval, driving suitable nak generator to access grey-level or binary iasks. Grey-level iasks used in bleaching or photopolyaer technology yield a CGO with variable iicrorelief thickness. optical lithography with a set of binary aasks or iulti-stepped electron-beaw lithography yields aulti-level COOK described by quantization of 'P . Raster scanning iask generator set up all saska iI the field G fros so called resolution cells G7that are centered in i;point, enuierated by dou

关键词： Quantization Wavefronts optical engineering Ions Raster graphics Spatial resolution Aspheric lenses Binary data Diffraction Phase transfer function

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design and Fabrication of Super mirrors on the Zerodur substrate

Design and Fabrication of Super mirrors on the Zerodur subst...

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conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Cho, Hyun-Ju Jeon, Young-Zip Daeduk Univ Dept Firearms & Opt 48 Jang Dong Taejon 305715 South Korea Daeduk Univ Dept Special Weapon Taejon 305715 South Korea

ISBN: (纸本)9780819482822

Super mirror is a high reflectance mirror with very low absorption and scattering losses. We carefully measured the surface roughness of Zerodur substrate using phase shift interferometer and atomic force microscope, and compared it with the scattering of the mirror. The absorption of the mirror was measured by cavity ring-down method, and its results were correlated to the thin film structure. To avoid the UV degradation which comes from the He-Ne plasma, we carefully select the mirror fabrication material, and design the high reflectance mirror. Finally, mirror was fabricated by ion beam sputtering method and its optical properties were measured.

关键词： super mirror ion beam sputtering super-polishing Zerodur loss roughness scattering UV degradation

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