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Solid State Lasers V Conference

作者： Hoffstadt, A Kolenda, J Ulbricht, M ELIGHT LASER SYST GMBH D-14513 TELTOWGERMANY

ISBN: (纸本)0819420727

The research and current state of the art of flash-lamp-pumped Ti:sapphire lasers are reviewed. Further, an overview of present applications of this type of laser is given, presenting in detail multispectral light detecting and ranging (LIDAR) for aerosol size distribution measurement, efficient laser vaporization and short-pulse amplification to high energies. Finally, recent achievements in the field of Ti:sapphire laser technology are presented. The improved design of discharge circuit and pump cavity resulted in increased laser efficiency, average power capability and reliability. Employing a semiconductor switch instead of a thyratron allows for a more compact, reliable and cost-effective set-up of the discharge circuit, which is supposed to meet the stringent requirements for electro-magnetic compatibility (EMC) of the laser systems more easily.

关键词： tunable solid-state laser Ti:sapphire laser flash-lamp-pumped overview applications new developments laser design pump-cavity design semiconductor switch

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Computational materials design and processing: Perspectives for atomistic approaches

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MATERIALS SCIENCE AND engineering B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY 1996年第1-3期37卷 72-82页

作者： Wimmer, E Biosym MsI Parc Club Orsay Université 20 rue Jean Rostand 91893 Orsay France

Theoretical and computational methods on the atomistic level have now matured to a point where their impact on the design of materials and their processing is becoming evident. This contribution provides an overview and critical assessment of the major current computational approaches with special emphasis on density functional methods. This is illustrated by characteristic examples including the chemisorption of a silane molecule on reconstructed Si(001) surfaces, the adhesion of NH3 to a CuO(111) surface, structural properties of LaNi5, the optical properties of ruby, and the magnetic properties of Co/Cu heterostructures. Immediate opportunities for atomistic approaches can be found in the development of novel functional electronic, optical and magnetic materials whereas the atomistic simulation of dynamic processes including phenomena such as fatigue and corrosion-while undeniably atomistic in origin-may need innovative conceptual and theoretical developments in order to bridge the gaps between atomistic, mesoscopic, and macroscopic length and fine scales.

关键词： materials atomic scale simulations density functional theory

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The influence of chemical composition on the refractive index thermal coefficient of liquids 6

The influence of chemical composition on the refractive inde...

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current developments in optical design and engineering VI 1996

作者： Fuller, Joseph B. C. Robb, Paul N. Sigler, Robert D. Abramov, Alexander P. Petrova, Maria V. Plyukhin, Andrey G. Tolstoy, Michael N. Lockheed Martin Palo Alto Research Labs Palo AltoCA94087 United States Vavilov State Optical Institute St. Petersburg Russia

Liquids have been shown to be very effective in the design of apochromatic lenses. The incorporation of abnormal liquids is complicated by their large thermal coefficients of refractive index (dn/dT). To make a glass-liquid design thermally stable, two liquids with different dn/dT and dispersions are typically used. This paper, which extends previously reported investigations of liquid dn/dT dependencies in the visible spectrum (SPIE Volume 2512,1995), explores the dependence of dn/dT, abnormal dispersion, and composition for a number of liquids. The optical property measurements were made at the Vavilov State optical Institute, St. Petersburg, Russia, in collaboration with the Lockheed Martin Advanced Technology Center, Palo Alto, California. © SPIE.

关键词： Refractive index

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Hardware and software developments for a closed-loop infrared mission simulation test capability

Hardware and software developments for a closed-loop infrare...

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Conference on Targets and Backgrounds - Characterization and Representation II

作者： Fugerer, RH Hervig, DJ Holt, LL SVERDRUP TECHNOL INC AEDC OPERATARNOLD AFBTN 37889

ISBN: (纸本)0819421235

The Arnold engineering Development Center (AEDC) scene generation test capability (SGTC) program has completed the development of a laser based direct write scene generation (DWSG) facility that provides dynamic mission simulation testing for infrared (IR) focal plane arrays (FPAs) and their associated signal processing electronics. The AEDC DWSG focal plane array test capability (FPATC) includes lasers operating at 0.514, 1.06, 5.4, or 10.6 micrometer, and acousto-optic deflectors (AODs) which modulate the laser beam position and amplitude. Complex radio frequency (rf) electronics controls each AOD by providing multi-frequency inputs. These inputs produce a highly accurate and independent multi-beam deflection or 'rake,' that is swept across the FPA sensor under test. Each rf amplitude input to an AOD translates into an accurate and independent beam intensity in the rake. Issues such as scene fidelity, sensor frame rates, scenario length, and real-time laser beam position adjustments require rf control electronics that employs the use of advanced analog and digital signal processing techniques and designs. By implementing flexible system architectures in the electronics, the overall capability of the DWSG to adapt to emerging test requirement is greatly enhanced. Presented in this paper is an overview of the signal processing methodology and designs required to handle the DWSG requirement. Further, the paper summarizes the current status of recent AEDC technology efforts tasked with the implementation of real-time and closed-loop scene manipulation including sensor optical simulation using the DWSG. The paper describes a proof-of-principle (PoP) demonstration which used high speed digital signal processors inherent in the DWSG electronic design to compute the rotation, translation, optical transfer function convolution, and system calibration functions during scene projection.

关键词： scene infrared FPA sensor analog digital RF acousto-optic deflector digital synthesizer frame

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current developments in optical design and engineering V

Current Developments in Optical Design and Engineering V

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current developments in optical design and engineering V

ISBN: (纸本)0819418994

This conference proceedings contains 31 papers on optical systems, devices and materials. The main topics are: design of anastigmat microscopes;abnormal dispersion liquids;optical imaging systems;telescopes;speckle cameras;spaceborne optical instruments;polymeric optical components;lidar;optical design and analysis;optical waveguides;infrared cameras;etc.

关键词： optical systems

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design and analysis of a spaceborne lidar telescope

Design and analysis of a spaceborne lidar telescope

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Conference on current developments in optical design and engineering V

作者： FENG, C AHMAD, A AMZAJERDIAN, F UNIV ALABAMA CTR APPL OPTHUNTSVILLEAL 35899

ISBN: (纸本)0819418994

A spaceborne telescope has been designed and analyzed for a 2-micron solid state coherent lidar system operating on a satellite. The optical system consists of a large off-axis reflective telescope, a large-aperture diffractive scanner, an image derotator and a lag angle compensator. Due to the orbiting motion of the satellite and scanning, the boresight of the telescope shifts during the round trip travel time of the laser pulses to the target. In a coherent lidar system utilizing optical heterodyne detection, the relative alignment of the received signal with respect to the local oscillator beam is particularly critical. Two compensators have been designed to correct the boresight errors as well as the wavefront errors caused by beam wandering due to the boresight changes. Several design approaches for the compensators have been investigated. The optical and optomechanical design issues for such a system are discussed. The results of optical performance, modeling, and tolerance analysis for the telescope are also presented.

关键词： optical design AND MODELING LARGE REFLECTIVE OPTICS DIFFRACTIVE OPTICS TOLERANCE ANALYSIS BORESIGHT SHIFT COMPENSATION LIDAR COHERENT LASER RADAR SATELLITE

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optical contour enhancement using a modified gradient filter

Optical contour enhancement using a modified gradient filter

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Conference on current developments in optical design and engineering V

作者： YAO, K GALERNE, P MICHEL, J FRACASSO, B GTS ECOLE NAVALE F-29240 BRESTFRANCE

ISBN: (纸本)0819418994

Although considered as low level processing, edge detection is a crucial step in object and image recognition. Such an operation can be implemented in real time by use of an appropriate transmittance in the Fourier plane of a so-called VanderLugt optical correlator. The performance of this scheme depends on both the contour enhancement operator chosen and the spatial filter design. For the latter point, great flexibility can be obtained by using computer generated holography techniques. In this framework, we propose to implement a particular contour extraction primitive, namely the summation of the partial derivatives of an input function, using a direct binary search (DBS) procedure for the design of the spatial filter. This first approach leads, however, to a non-detection of the contours oriented at 45 degrees to the abcissa axis. To solve this problem we propose a modified gradient holographic filter. A theoretical analysis and simulation results are presented.

关键词： optical filters

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Low transmission loss prism for optical switches designed by means of optical power evaluation computer program

Low transmission loss prism for optical switches designed by...

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Conference on current developments in optical design and engineering V

作者： TAKIGAWA, T TANAKA, H SANO, Y FUJI ELECT CORP RES & DEV LTD HINOTOKYO 191JAPAN

ISBN: (纸本)0819418994

We have developed a low transmission loss prism for optical switches suitable for optical fiber systems which monitor and control factory equipment. We have realized the low transmission loss prism by using the geometrical property of ellipsoids and a newly developed optical power evaluation computer program which facilitates estimating the coupling efficiency between two optical fibers considering total reflection phenomena, numerical aperture and far field pattern of the optical fiber for an aspherical optical system. The transmission loss of the present ellipsoidal prism is 5 dB for the plastic fiber with the core diameter of 1 mm, and 5.8 dB for polymer clad fiber with core diameter of 0.2 mm. The present ellipsoidal prism improves transmission loss by 4 dB as compared with the conventional spherical prism for the optical fibers usually adopted to the optical fiber systems. The calculated loss and experimental loss agreed well. This agreement confirms the usefulness of our computer program.

关键词： LOW TRANSMISSION LOSS PRISM ELLIPSOID optical SWITCH optical FIBER optical POWER EVALUATION COMPUTER PROGRAM

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Personal project management for optical design

Personal project management for optical design

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current developments in optical design and engineering V

作者： Weller, Scott W. Optikwerk Inc. Rochester NY USA

current optical design software provides little support for the mundane human oriented tasks of personal project management. Project management tools from other domains are not readily applied to the optical design pr... 详细信息

ISBN: (纸本)0819418994

关键词： optical systems

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Synthesis of optical systems using global optimization method

Synthesis of optical systems using global optimization metho...

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current developments in optical design and engineering V

作者： Gan, Michael A. Smirnov, S.E. Fedorov, Alexander O. S.I. Vavilov State Optical Inst. St. Petersburg Russia

Combination of global optimization technique with 3-D order monochromatic and first order chromatic aberrations theory may be useful to search an initial system for optical design. Multivariant synthesis of an optical... 详细信息

ISBN: (纸本)0819418994

关键词： optical systems

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