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

共 444 条记录，以下是341-350 订阅

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International innovations in optical finishing

International innovations in optical finishing

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conference on current developments in lens design and optical engineering V

作者： Jacobs, SD Univ Rochester Ctr Opt Mfg Rochester NY 14623 USA

ISBN: (纸本)0819454613

Every few years new polishing technologies attempt to make the transition from the research laboratory into the commercial sector. Success awaits any process that is well controlled and predictable (e.g., deterministic), rapid, capable of smoothing to sub-rum rms roughness levels while removing damage from grinding, affordable, and easily implemented. Applicability to different optical materials and a variety of part sizes and shapes is extremely important, but may not be required for a new technology to succeed in a niche market. This paper reviews six innovations in polishing of precision optics: Canon's Super-Smooth Polisher (CSSP) that uses a sub-aperture pitch lap - a relatively mature but important base-line technology;Nikon/Osaka University's RF Plasma Chemical Vaporization Machining (CVM);Epion's Gas Cluster Ion Beam (GCIB) Process;the IOM University of Leipzig/NTGL Ion Beam Finishing (IBF) Technology;Zeeko's "Precessions" Process with a sub-aperture section of an inflatable pad;and QED Technology's Magnetorheological Finishing (MRF) with a magnetic fluid ribbon. The removal mechanism and some recent achievements for each process are discussed.

关键词： optical finishing pitch polishing sub-aperture lap computer numerical control ion beams magnetic fluids

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optical PCB using waveguide-embedded backplane

Optical PCB using waveguide-embedded backplane

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conference on current developments in lens design and optical engineering V

作者： Yoon, KY Cho, IK Ahn, SH Kim, JT Elect & Telecommun Res Inst Taejon 305350 South Korea

ISBN: (纸本)0819454613

A practical optical printed circuit board (PCB) was demonstrated, using a waveguide-embedded optical backplane and processing boards. The polymeric waveguide was produced by means of a hot embossing technique then embedded following a conventional lamination processes. The core size of waveguide was 100 x 60 mum(2) (input section), 60 X 60 mum(2) (output section), and the propagation loss of tapered polymeric waveguide was approximately 0.1 dB/cm at 850 nm. We prepared a optical backplane with polymeric waveguide by using conventional multilayer board lamination processes. The transmission power and dimension of the optical backplane was same as those of waveguide before lamination. A metal optical bench was used as a packaging die for the optical devices and the integrated circuit chips in both the transmitter and the receiver processing boards. We used a 1 x 4 850 nm VCSEL array with 2 dBm of output power for the transmitter and a PIN photodiode array for the receiver. We successfully demonstrated 8 Gb/s of data transmission between the transmitter processing board and the optical backplane board.

关键词： polymeric waveguide hot embossing technique optical backplane optical printed circuit board waveguide-embedded backplane metal optical bench multilayer board lamination board-to-board interconnection

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Avoiding unstable regions in the design space of EUV mirror systems comprising high-order aspheric surfaces

Avoiding unstable regions in the design space of EUV mirror ...

引用

conference on current developments in lens design and optical engineering V

作者： Marinescu, O Bociort, F Braat, J Delft Univ Technol Opt Res Grp NL-2628 CJ Delft Netherlands

ISBN: (纸本)0819454613

When Extreme Ultraviolet mirror systems having several high-order aspheric surfaces are optimized, the configurations often enter into highly unstable regions of the parameter space. Small changes of system parameters lead then to large changes in ray paths, and therefore optimization algorithms crash because certain assumptions upon which they are based become invalid. We describe a technique that keeps the configuration away from the unstable regions. The central component of our technique is a finite-aberration quantity, the so-called quasi-invariant, which has been originally introduced by H. A. Buchdahl. The quasi-invariant is computed for several rays in the system, and its average change per surface is determined for all surfaces. Small values of these average changes indicate stability. The stabilization technique consists of two steps: First, we obtain a stable initial configuration for subsequent optimization by choosing the system parameters such that the quasi-invariant change per surface is minimal. Then, if the average changes per surfaces of the quasi-invariant remain small during optimization, the configuration is kept in the safe region of the parameter space. This technique is applicable for arbitrary rotationally symmetric optical systems. Examples from the design of aspheric mirror systems for EUV lithography will be given.

关键词： mirror systems aspheres EUV lithography optimization relaxation

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Improving efficiency of beam splitter for DVD pickup

Improving efficiency of beam splitter for DVD pickup

引用

conference on current developments in lens design and optical engineering V

作者： Chen, WJ Chen, CH Shieh, HPD Natl Taiwan Univ Sci & Technol Dept Elect Engn Taipei 106 Taiwan

ISBN: (纸本)0819454613

The majority of the beam splitters for three beam tracking in commercial DVD pickup employ lamellar phase gratings, which already provides sufficient efficiency. However, for a pickup with all diffractive elements, the power budget becomes more critical, and a higher efficiency of the beam splitter is required. In this paper, we have investigated and will present the influence of the desired energy ratio between the zeroth order central beam to the first order side beam on the total efficiency of the beam splitter. The simulation based on scalar diffraction theory shows that the total efficiency of a lamellar phase grating will drop as the ratio decrease, which can be improved by employing a more sophisticated surface relief. The equal-side triangular profile has been investigated as a solution and the geometrical size of the profile has been optimized for several desired energy ratio. For a low cost fabrication process with photolithography, the total efficiency loss due to quantization with different quantization levels of the triangular surface relief has been estimated with scalar diffraction theory. This paper is concluded with a table of optimal phase level for a given energy ratio and desired minimum total efficiency with the consideration of fabrication cost.

关键词： DVD pickup beam splitter diffractive optical element

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A simple focal-length measurement technique for adaptive microlenses using Z-scan

A simple focal-length measurement technique for adaptive mic...

引用

conference on current developments in lens design and optical engineering V

作者： Abdelaziez, Y Banerjee, P Univ Dayton ECE Dept Dayton OH 45469 USA

ISBN: (纸本)0819454613

A simple technique for focal length measurements of adaptive micro-lenses using z-scan is reported. Focal length is one of the most important parameters of any lens. The effective focal length is measured with reference to the principal points that are not easy to find especially for micro-lenses. In addition, variable focal length microlenses pose a different challenge that makes the process of determining their exact focal length a tedious and difficult process. Classical methods such as nodal slide and magnification have been used for focal length determination. Also, advanced Interference techniques such as Talbot, Moire, Digital Speckle, Zygo and Joint Fourier Transform were used for focal length measurements. These techniques require more elaborate setups and difficult to implement, especially for microlenses. Recently a power meter was used to find the focal length of an unknown lens. Most of the techniques mentioned above proof to be not simple for microlens characterization. The z-scan technique has been implemented, for quite sometimes, to characterize the third-order effects of a nonlinear optical material. The z-scan provides information on both the sign and magnitude of the non-linear refractive index and offer advantage of simplicity. We have used a regular lens to collimate and focus light unto the lens under test. By scanning the lens under test and measuring the on-axis intensity, one can find the focal length. This is because the on-axis intensity is proportional to the phase of the lens and therefore the focal length. In the case of an adaptive lens with its focal length is a function of the applied voltage, the scanning occurs for each voltage value that will correspond to the on-axis refractive index change and therefore the far field on-axis intensity. This described technique above is easy to implement and can achieve good accuracy due to the inherent sensitivity of the z-scan.

关键词： focal length z-scan PLZT adaptive micro-lens

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Fielding of an imaging VISAR diagnostic at the National Ignition Facility (NIF)

Fielding of an imaging VISAR diagnostic at the National Igni...

引用

conference on current developments in lens design and optical engineering V

作者： Malone, RM Bower, JR Capelle, GA Celeste, JR Celliers, PM Frogget, BC Guyton, RL Kaufman, MI Lare, GA Lee, TL MacGowan, BJ Montelongo, S Ng, EW Thomas, TL Tunnell, TW Watts, PW Bechtel Nevada Los Alamos NM 87544 USA Lawrence Livermore Natl Lab Livermore CA 94551 USA

ISBN: (纸本)0819454613

The National Ignition Facility (NIF) requires diagnostics to analyze high-energy density physics experiments. As a core NIF early light diagnostic, this system measures shock velocities, shock breakout times, and shock emission of targets with sizes from I to 5 mm. A 659.5 nm VISAR probe laser illuminates the target. An 8-inch-diameter fused silica triplet lens collects light at f/3 inside the 33-foot-diameter vacuum chamber. The optical relay sends the image out an equatorial port, through a 2-inch-thick vacuum window, and into two VISAR (Velocity Interferometer System for Any Reflector) interferometers. Both streak cameras and CCD cameras record the images. Total track is 75 feet. The front end of the optical relay can be temporarily removed from the equatorial port, allowing for other experimenters to use that port. The first triplet can be no closer than 500 mm from the target chamber center and is protected from debris by a blast window that is replaced after every event. Along with special coatings on the mirrors, cutoff filters reject the NIF drive laser wavelengths and pass a band of wavelengths for VISAR, for passive shock breakout light, or for thermal imaging light (bypassing the interferometers). Finite Element Analysis was performed on all mounting structures. All optical lenses are on kinematic mounts, so that the pointing accuracy of the optical axis can be checked. A two-color laser alignment scheme is discussed.

关键词： VISAR optical relay interferometer National Ignition Facility (NIF) streak camera

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optical design for imaging spectroscopy

Optical design for imaging spectroscopy

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conference on current developments in lens design and optical engineering IV

作者： Mouroulis, P Green, RO CALTECH Jet Prop Lab Pasadena CA 91109 USA

design examples are given for imaging spectrometer systems operating in the solar reflected spectrum. design considerations and procedures are outlined for incoherently and coherently coupled systems. The case of a pa... 详细信息

ISBN: (纸本)0819450464

关键词： optical design imaging spectroscopy concentric spectrometers convex/concave gratings

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optical systems for free-space laser communications

Optical systems for free-space laser communications

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conference on current developments in lens design and optical engineering IV

作者： Hemmati, H CALTECH Jet Prop Lab Pasadena CA 91109 USA

An overview of optical systems utilized in JPL's optical Communications research is provided here. These include discussions on the flight terminal optics, the ground receiver aperture and the uplink beacon or com... 详细信息

ISBN: (纸本)0819450464

关键词： telescope flight optics photon buckets and optical communications

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Replication optics for a holographic 3D display system

Replication optics for a holographic 3D display system

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conference on current developments in lens design and optical engineering IV

作者： Wood, A Smith, M Stanley, M Thales Opt Ltd St Asaph LL17 0LL Denbigh Wales

ISBN: (纸本)0819450464

The display of 3D images containing all the depth cues required by the human vision system can be achieved using a reconfigurable Computer Generated Hologram (CGH) with high pixel count. A technique which has been developed to produce CGH's with the required number of pixels, and at video refresh rates, is known as Active Tiling((TM)) (AT). At the heart of an AT system is a set of replication optics which produces multiple images of a Spatial Light Modulator (SLM) onto the CGH. The design of two alternative optical systems for generating a 5x5 tiled array of de-magnified images of a single object is discussed. Results are presented from a 4-channel AT system which has recently been built and demonstrated.

关键词： optical design computer generated holograms 3D display

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A new method to treat a spherical lens as a combination of two perpendicular lengthless cylindrical lenses in ray tracing

A new method to treat a spherical lens as a combination of t...

引用

conference on current developments in lens design and optical engineering IV

作者： Al-Ali, LS Rasheed, KH Ajman Univ Sci & Technol Ajman U Arab Emirates

ISBN: (纸本)0819450464

We present a new suggestion for treating skew rays. In the new suggestion. we hypothetically divide a spherical lens. at each point of intersection of the incident rays with the spherical lens. into two effective perpendicular lengthless cylindrical lenses. One of the hypothetical cylindrical lenses is effective in the vertical direction while the other is effective in the horizontal direction. A method is given for calculating the resulted vertical and horizontal angles of refraction. After calculating these angles one can combine. at that point of incidence. the two components into a vector sum to find the resultant refracted ray. The new suggested method is first discussed and demonstrated for one single lens. and then generalized to optical systems of many components. The method's power and effectiveness in lens and optical systems design is demonstrated. A software package is designed and written for the purpose of optical ray tracing. The new method is implemented in this software. The name we gave to this package is "CALOSD". CALOSD is an acronym for Computer Aided lens and optical Systems design. CALOSD is capable of producing very accurate tabulated data as well as graphical displays of an optical system and rays traced from different points or angles of view: including a top view.

关键词： lens design ray tracing meridian and skew rays approximate and exact methods

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