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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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Studies of the manufacturability of the HOE included in objective of BD/DVD combined optical pick-up head according to the objective lens glass type - art. no. 66670O

Studies of the manufacturability of the HOE included in obje...

引用

conference on current developments in Lens design and optical engineering VIII

作者： Lisitsyna, N. V. Bauman Moscow State Tech Univ Moscow 105005 Russia

ISBN: (纸本)9780819468154

The new combined optical pick-up head for recording and playback of information on DVD and BD format discs was developed. The same objective is used for both channels. It consists of the objective lens and Holographic optical Element. In this work we present the main results of the studies of the possibility to manufacture the HOE included in objective of BD/DVD combined optical pick-up head in the dependence on objective lens glass type.

关键词： optical data storage diffractive optics

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design and analysis of a diffractive astigmatic lens for DVD pickup

Design and analysis of a diffractive astigmatic lens for DVD...

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conference on current developments in Lens design and optical engineering VIII

作者： Chen, Wen-Jie Chen, Cheng-Huan Univ Minnesota Dept Elect & Comp Engn St Paul MN USA Natl Tsing Hua Univ Dept Power Mech Engn Hsinchu Taiwan

ISBN: (纸本)9780819468154

A refractive astigmatic lens is employed to generate a focus error signal (FES) for servo control in general optical pickup. In this paper, a diffractive optical element (DOE) is designed to implement optical functions of astigmatic focusing for a MEMS-based miniature optical pickup at 650nm wavelength. We present a diffractive astigmatic lens with its internal zones and external zones quantized into four, two phase levels, respectively based on fabrication consideration. The optical simulation based on scalar diffraction theory shows the efficiency of this quantized lens for astigmatic focusing and a comparison of the FES in the optical pickup system has been plotted.

关键词： DVD pickup astigmatic lens diffractive optical element focus error signal

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optical encoder based on a non diffractive beam

Optical encoder based on a non diffractive beam

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conference on current developments in Lens design and optical engineering VIII

作者： Lutenberg, A. Perez Quintian, F. Rebollo, M. A. Univ Buenos Aires Fac Ingn Lab Aplicac Opt Av Paseo Colon 850 Buenos Aires DF Argentina

ISBN: (纸本)9780819468154

Nowadays most industrial and laboratory motion measuring equipment makes use of optical encoders to measure rotation and linear displacements with sub-micrometrical resolution. In this work we introduce a new design of an optical encoder based on a non diffractive beam, a binary amplitude grating and a monolithic photodetector. Two theoretical models of the system are proposed and implemented to obtain numerical results. The performance of the design is also investigated through experimental measurements. Finally, the experimental results are compared with the models predictions.

关键词： metrology optical encoder sub-micrometric resolution non diffractive beam gratings

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Mechanical design and analysis of a variable focal length lens

Mechanical design and analysis of a variable focal length le...

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conference on current developments in Lens design and optical engineering VIII

作者： Gonzalez-Garcia, Jorge Cruz-Martinez, Victor Manuel Mendoza-Jasso, Alvaro Jesus Santiago-Alvarado, Agustin Vazquez-Montiel, Sergio Rayas-Alvarez, Juan Antonio Castro-Ramos, Jorge Univ. Tecnológica de la Mixteca (Mexico) Instituto Nacional de Astrofísica Óptica y Electrónica (Mexico) Ctr. de Investigaciones en Óptica (Mexico)

ISBN: (纸本)9780819468154

Studies on adaptive lenses, which are formed of two transparent elastic surfaces and have a transparent liquid medium between them, have focused mostly on the characterization, analysis and optical performance of the proposed lenses. No attention, however, has been given to the mechanical design that would allow the conception of a user-friendly functional mounting that is adaptable to conventional optical systems. This work, therefore, presents the design and manufacturing processes of the mounting for a 20 mm diameter biconvex adaptive lens. It also presents an analysis of the membranes used as elastic surfaces and the images formation of the proposed lens.

关键词： adaptive elastic surfaces liquid lens mounting design

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Practical guide to saddle-point construction in lens design

Practical guide to saddle-point construction in lens design

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conference on current developments in Lens design and optical engineering VIII

作者： Bociort, Florian van Turnhout, Maarten Marinescu, Oana Delft Univ Technol Opt Res Grp Lorentzweg 1 NL-2628 CJ Delft Netherlands

ISBN: (纸本)9780819468154

Saddle-point construction (SPC) is a new method to insert lenses into an existing design. With SPC, by inserting and extracting, lenses new system shapes can be obtained very rapidly, and we believe that, if added to the optical designer's arsenal, this new tool can significantly increase design productivity in certain situations. Despite the fact that the theory behind SPC contains mathematical concepts that are still unfamiliar to many optical designers, the practical implementation of the method is actually very easy and the method can be fully integrated with all other traditional design tools. In this work we will illustrate the use of SPC with examples that are very simple and illustrate the essence of the method. The method can be used essentially in the same way even for very complex systems with a large number of variables, in situations where other methods for obtaining new system shapes do not work so well.

关键词： optical system design optimization saddle points

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Aplanatic hybrid lenses

Aplanatic hybrid lenses

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conference on current developments in Lens design and optical engineering VIII

作者： Garcia-Lievanos, O. Vazquez-Montiel, S. Inst Nacl Astrofis Opt & Electr Luis Enr Erro 1 Puebla 72000 Mexico

ISBN: (纸本)9780819468154

We propose a novel method to correct the spherical and coma aberration using a hybrid element (refractive-diffractive). The refractive surface is used to correct the coma, we obtain this condition curving the second principal plane and centred it on the axial point image. The diffractive element is used to correct the spherical aberration using an exact ray trace and the diffractive coefficients as variables. The optimization routine is no required. This method can be used for any conjugates position.

关键词： Monochromatic aberrations Ray tracing Lenses Lens design Refractive index Spherical lenses Diffraction gratings Distance measurement optical spheres Refraction

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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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optical design method for high zoom ratio lens with liquid lens and digital signal processing

Optical design method for high zoom ratio lens with liquid l...

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conference on current developments in Lens design and optical engineering VIII

作者： Hu, Chao-Chang Fang, Yi Chin Tsai, Chen-Mu Lin, Han-Ching Su, Han-Wei Lin, Yu-Cheng Industrial Technology Research Institute-South (Taiwan) National Kaohsiung Univ. of Science and Technology (Taiwan) Kun Shan Univ. (Taiwan)

ISBN: (纸本)9780819468154

This research proposes a newly developed method to high zoom lens for mobile phone use, which the overall length is restricted in mobile phone size acceptable. Generally speaking, the optical design with liquid lens might be more complicated in optimization than traditional optics;not only because aspherical coefficient in liquid lens element is difficult to be defined and measured, but also because efficient optics layout needs more efforts to study in the near future. The paper mainly utilizes liquid lens in order to short total length;two liquid lens elements must be included. Besides consider total length, Lateral aberration also is very important. Lateral aberration will play a significant role in the Modulation Transfer function (MTF), so, the optical design will be able to arise very big, and that the many kinds of chromatics aberration with two groups of liquid lens. Using Digital Signal Processing technology principal factor why this also is.

关键词： optical simulation optical optimization zoom system liquid lens digital signal processing step motor

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Focal splitting and optical vortex structure induced by stress birefringence

Focal splitting and optical vortex structure induced by stre...

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conference on current developments in Lens design and optical engineering VIII

作者： Spilman, Alexis K. Beckley, Amber M. Brown, Thomas G. Univ Rochester Inst Opt Rochester NY 14627 USA

ISBN: (纸本)9780819468154

A variety of interesting polarization effects can be observed using a parallel-face window placed under symmetric stress of order m = 3 and illuminated with polarized light. Such windows, when placed under sufficient stress, can produce rings of alternating vortex and non-vortex fields. When light is brought to a focus, one component of circular polarization forms two nearly diffraction limited focal spots with axial separation larger than the usual depth of focus. We analyze and experimentally test these phenomena using interferometric methods as well as a Strehl ratio model and conclude by discussing applications to optical imaging.

关键词： polarization birefringence vortex beams

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Modeling of polychromatic MTF losses due to secondary effects in diffractive lenses

Modeling of polychromatic MTF losses due to secondary effect...

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conference on current developments in Lens design and optical engineering VIII

作者： Thorpe, Michael D. Jonas, Reginald P. Szapiel, Stanislaw ELCAN Opt Technol 450 Leitz Rd Midland ON L4R 5B8 Canada

ISBN: (纸本)9780819468154

Although hybrid (i.e. refractive-diffractive) surfaces are in common use in optical design there are several phenomena which affect design MTF that are not routinely modeled in current commercial versions of optical desig,n software. Typically the details of the diffractive structure are not taken into account and rays are traced through the hybrid surface employing a vector grating equation which uses the phase gradient associated with the diffractive definition to calculate a local grating spacing and orientation and from this grating information a 'diffracted ray' angle. This geometrical-optics based procedure has limitations;(I)it considers only the design diffraction order, (2)it does not take into account the sub-aperturing effect whereby color correction is reduced along, with zone count, and (3) the model used does not generate an exact blaze profile. In this paper we discuss progress in application of diffraction-based beam propagation tools in combination with a physical definition of the diffractive structure to more accurately model these secondary effects on design MTF. Results are given for some simple lenses and also the effects to be expected for a more complex zoom lens.

关键词： lens design lenses

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