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Locking Lorentz Slides

Locking Lorentz Slides

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Conference on current developments in optical design and engineering Vii

作者： Vranish, JM Germann, LM Lutter, DR Lawrence, DA NASA Goddard Space Flight Ctr Greenbelt MD 20771 USA

ISBN: (纸本)0819428841

The purpose of this paper is to introduce the concept of a Locking Lorentz Slide. Lorentz Slide actuators, which are based on the Lorentz force principal of physics and are also called Voice Coils, have earned wide-spread. use in the aerospace industry because of their superior performance (precision, force, stroke, wide temperature range including cryogenics, reliability and compactness). NASA has particularly favored these devices in their space telescopes and scientific instruments. Up to now "Voice Coils" have had to keep power on to hold position, which is limiting in many space applications. NASA, however, has found what promises to be a simple, innovative work-around with its Locking Lorentz Slide approach. This paper is an introduction to that concept and its possibilities, so, in this paper, the Locking Lorentz Slide is described, its principles of operation explained and its expected performance given. Since NASA is embarking on a development effort for this actuator more technical papers detailing hardware, tests and detailed analysis will follow.

关键词： Actuators Servomechanisms Space telescopes Aerospace engineering Cryogenics Magnetism Reliability Sensors Hardware testing Temperature metrology

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Minimizing tool marks in deterministic microgrinding

Minimizing tool marks in deterministic microgrinding

引用

Conference on current developments in optical design and engineering Vii

作者： Li, Y Gracewski, S Funkenbusch, P Ruckman, J Univ Rochester Ctr Opt Mfg Rochester NY 14627 USA

ISBN: (纸本)0819428841

In deterministic microgrinding of glass optics with metal bond diamond ring tools, optical surfaces exhibit residual cutting tool marks that can significantly affect the efficiency of the finish polishing process;The tool marks for spherical surface generation appear as curves that follow contact lines between the tool and workpiece from the center to the edge of the workpiece. The tool marks are circumferentially periodic and the number is typically equal to the k-ratio, i.e. the ratio of grinding tool speed to workpiece speed. This paper describes the effect of the k-ratio, the tool cutting face width, and their interaction on tool mark generation. We introduce a new parameter equal to the ratio of tool cutting face width to the k-ratio spacing. Experimental results indicate that this ratio is the critical factor for tool mark generation. For ratios greater than a critical value, the amplitude of tool marks will be reduced to a level not detectable by interferometry. The influences of vibration and tool roughness are also discussed. The model presented provides new insight into the generation of tool marks and optimization of deterministic microgrinding processes.

关键词： grinding optical fabrication machine vibration tool marks tool cutting face width tool alignment

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design and fabrication of hybrid dichroic mirrors for light separation/recombination by using flat plate

Design and fabrication of hybrid dichroic mirrors for light ...

引用

Conference on current developments in optical design and engineering Vii

作者： Park, JH Hwang, YM Kim, YH Kim, EH Jeong, SY Samsung Adv Inst Technol Display Mat Lab Mat & Devices Sector Suwon 440600 South Korea

ISBN: (纸本)0819428841

We report the design and fabrication of Hybrid Dichroic Mirrors (HDM) for the separation and the recombination of white laser beam by using small sized flat plate far a small Laser Projection Display (LPD) system. This small sized laser projection display system is consist of a white laser, hybrid dichroic mirrors, 3-channel AOM and a beam scanning part. Red, green and blue light beams are separated by one flat plate dichroic mirror and also modulated by the 3-channel AOM, are recombined to one beam by another flat plate dichroic mirror. These hybrid dichroic mirrors are designed to measure the separation and recombination of s-polarized light beams of 647, 515, 488nm wavelength from the white laser. Key element of the mirror design includes the quarter wavelength multilayers optimized to provide the best performance for the separation and recombination of light beams. The calculated values of the transmittance, which are pass through the hybrid dichroic mirror, are 95% for each separated/recombined color beams. The measured values of transmittance are over 90%.

关键词： Hybrid Dichroic Mirrors Laser Projection Display 3-channel AOM separation and recombination

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3-channel acousto-optic modulator for laser projection display system

3-channel acousto-optic modulator for laser projection displ...

引用

Conference on current developments in optical design and engineering Vii

作者： Kim, YH Park, JH Cha, SN Hwang, YM Samsung Adv Inst Technol Display Mat Lab Mat & Devices Sector Suwon 440600 South Korea

ISBN: (纸本)0819428841

A small laser projection display system is designed with a hybrid dichroic mirror for color separation, a hybrid dichroic mirror for color recombination, a 3-channel acousto-optic modulator(AOM) and a scanning part. The 3-channel AOM modulates red, green and blue laser breams. The wavelengths of red, green and blue beams are 647, 515 and 488 nm respectively. The carrier frequencies of each channel of AOM were adjusted to minimize the diffraction angle differences among red, green and blue laser beams. The carrier frequencies are 130, 168, 178 MHz for red, green and blue laser beams respectively. The measured diffraction angle after the carrier frequency control equals to the calculated diffraction angle. The transducer structure of AOM was optimized to get a high diffraction efficiency and to maximize isolation between adjacent channels by a slicing saw, which enhanced the electrical and acoustic isolation. The impedance matching-circuit of each electrode is housed in a separate compartment to suppress electrical crosstalk. The diffraction efficiency and risetime of the 3-channel AOM are over 85% and 50 nsec per each cell. The crosstalk between the channels is less than -30 dB.

关键词： 3-channel acousto-optic modulator hybrid dichroic mirrors laser projection display optical crosstalk electrical crosstalk

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Optimized design on the light outlet of optical fibre large screen display

Optimized design on the light outlet of optical fibre large ...

引用

Proceedings of the 1998 Conference on current developments in optical Elements and Manufacturing

作者： Shen, Shuqun Yao, He Shen, Yuchao Fan, Rong Beijing Univ of Posts & Telecom Beijing China

optical fibre large screen display is a novel technique in the field of large screen display. The design of the optical fibre light outlet (polyvinyl rode shaped) should be optimized in consideration of the viewing field and the radiant intensity of the screen. The principal direction and the field distribution of the light output of the rode shaped outlet should be considered in designs. The conclusion of the computer simulation shows that the brightness of the screen will reach 4000 nit, the viewing angle will be 20° in meridian plane and 120° in sagittal plane.

关键词： Fiber optics

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design and fabrication of 256×256 diffractive microlens arrays on Si substrates

Design and fabrication of 256×256 diffractive microlens arr...

引用

Proceedings of the 1998 Conference on current developments in optical Elements and Manufacturing

作者： Li, Yi Yi, Xinjian Hao, Jianhua Huazhong Univ of Science and Technology Wuhan China

256×256 diffractive microlens arrays have been designed by considering the independent optical and processing parameters for 3-5 μm wavelength with a microlens size of 100 μm. The lens F number and array pitch are 1.5 and 100 μm, respectively. The diffractive microlens arrays have been fabricated on the surface of Si substrates by successive photolithography and Ar+ ion-beam-etching technique. The practical processes and fabrication method are discussed. The optical characteristics and measurements of the diffractive microlens arrays are presented.

关键词： optical instrument lenses

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design and fabrication of GaAs OMIST photodetector

Design and fabrication of GaAs OMIST photodetector

引用

Proceedings of the 1998 Conference on Integrated Optoelectronics ii

作者： Kang, Xuejun Lin, Shiming Liao, Qiwei Gao, Junhua Liu, Shi'an Cheng, Peng Wang, Hongjie Zhang, Chunhui Wang, Qiming Academia Sinica Beijing China

We designed and fabricated GaAs OMIST (optical-controlled Metal-Insulator-Semiconductor Thyristor) device. Using oxidation of AlAs layer that is grown by MBE forms the Ultra-Thin semi-Insulating layer (UTI) of the GAAS OMIST. The accurate control and formation of high quality semi-insulating layer (AlxOy) are the key processes for fabricating GaAs OMIST. The device exhibits a current-controlled negative resistance region in its I-V characteristics. When illuminated, the major effect of optical excitation is the reduction of the switching voltage. If the GaAs OMIST device is biased at a voltage below its dark switching voltage Vs, sufficient incident light can switch OMIST from high impedance low current `off' state to low impedance high current `on' state. The absorbing material of OMIST is GaAs, so if the wavelength of incident light within 600 to approximately 850 nm can be detected effectively. It is suitable to be used as photodetector for digital optical data process. The other attractive features of GaAs OMIST device include suitable conducted current, switching voltage and power levels for OEIC, high switch speed and high sensitivity to light or current injection.

关键词： Photodetectors

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Computational materials science: an increasingly reliable engineering tool (example: defects in HgCdTe alloys)

Computational materials science: an increasingly reliable en...

引用

Conference on Photodetectors - Materials and Devices iiI

作者： Sher, A van Schilfgaarde, M Berding, MA SRI Int Menlo Park CA 94025 USA

ISBN: (纸本)0819427268

Computational materials science has evolved in recent years into a reliable theory capable of predicting not only idealized materials and device performance properties, but also those that apply to practical engineering developments. The codes run on workstations and even now are fast enough to be useful design tools. A review will be presented of the current status of this rapidly advancing field. As a demonstration of the power of the methods, predictions of the native point and complex defect, and impurity densities for the Hg-0.8 Cd0.2Te alloy as functions of external processing conditions will be treated. Where measurements have been done, the observed values agree well with the predictions. As an example, we fmd that As incorporates predominately on the cation sublattice, if the material is grown from the Te side of the existence curve las occurs in MBE growth), whereas it tends to reside on the anion sublattice in Hg-saturated growth. On the cation sublattice As is a donor. It is an acceptor on the Te sublattice. We have devised a post-MBE-growth processing method to encourage the transfer of As from the cation to the anion sublattice. Those aspects of the proposed process that have been tested work.

关键词： computational materials science defects in HgCdTe

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Inchworm® motor developments for the Next Generation Space Telescope (NGST)

Inchworm&reg motor developments for the Next Generation Spac...

引用

current developments in optical design and engineering Vii

作者： Henderson, David Fasick, John C. Burleigh Instruments Inc. Burleigh Park 7647 Main Street Fishers NY 14453 United States

A new NGST Inchworm&reg motor design is described that meets the demanding actuator requirements of the Next Generation Space Telescope. The classic Inchworm motor does not function at cryogenic temperatures. The ... 详细信息

A new NGST Inchworm® motor design is described that meets the demanding actuator requirements of the Next Generation Space Telescope. The classic Inchworm motor does not function at cryogenic temperatures. The interference fit between the motor and shaft gets tighter and breaks the clamps and 80 percent of piezoelectric (PZT) movement is lost at 20° K. The NGST Inchworm concept maintains a constant fit over a wide temperature range and the loss of PZT motion is compensated for by adding extra PZT material or potentially by incorporating new cryogenic active materials that are currently being developed by other companies. Another significant improvement of the NGST Inchworm is the ability to hold position when power is removed (i.e. zero charge on all actuators) with zero PZT creep. This makes it possible for the NGST Inchworm and electronics to dissipate zero power when holding position for days or weeks. The NGST Inchworm will have a new clamp design that has at least ten times lower clamp "glitch" than the classic Inchworm. Low clamp glitch makes it possible to move to a desired position with nanometer resolution and deactivated the motor without disturbing the output position more than a few nanometers.

关键词： Space telescopes

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Optimum junction depth design of the S/D extension regions (MDD) for sub-0.18 μm CMOS technologies

Optimum junction depth design of the S/D extension regions (...

引用

Microelectronic Device Technology ii

作者： Chao, CP Mehrotra, M Chen, IC Texas Instruments Inc Dept Silicate Technol Dallas TX 75243 USA

ISBN: (纸本)0819429651

For scaled CMOS technologies, the source/drain-extension (MDD) junction depth (Xj) is important in achieving optimized device performance. According to the SIA roadmap, Xj is about 0.3-0.5 times the nominal gate length (Lgnom) for previous device generations as shown in Fig.l. For devices with fixed Lgnom, shallower MDD can improve the short channel effects and the drive current sensitivity, however, trade-off occurs due to the increase in effective gate length and channel resistance. Various engineering techniques such as pocket implant can also change the requirement for Xj. It is therefore important to predict the Xj requirement for Various transistor designs and facilitate faster turn-around time and minimize the design cost. In this work, a tuned 2-D MEDICI simulator is used to investigate the effect of Xj for 0.1 mu m to 0.15 mu m gate length devices. Effects of pocket implant and the use of an additional MDD spacer are compared. Both high performance (maximum off current =InA/mu m) and low power (maximum off current =001nA/mu m) devices are studied. For a given device design, an optimum Xj is found where the nominal drive current is maximized for fixed Lgnom and source/drain resistance (Rs,) Key results are as following. (1) For high performance devices with pocket implant, the optimum Xj for S/D extension is similar to 300A (450A) for 0.1 mu m (0.13 mu m) Lgnom devices. Without pocket implant, the optimum Xj is reduced to similar to 250A (300A) which falls below the predicted lower limit of 0.3xLgnom. The improvement in the short channel roll-off by pocket implant allows the use of deeper junctions. Furthermore a 5% increase in nominal drive current is also observed for 0.1um devices with pocket implant. (2) The Xj requirement can be relaxed by using a thin MDD sidewall spacer. By adding a 200A MDD spacer, the optimum Xj for high performance device with pocket implant is similar to 450A and 550A for 0.1 mu m and 0.13 mu m node devices. However, addition of a

关键词： sub-0.15 mu m CMOS TCAD sour/drain extension MDD simulation

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