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optical gain measurement through a medium with both temporal and spatial refractive index variations 2

Optical gain measurement through a medium with both temporal...

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developments in Laser Technology ii 1973

作者： Holly, Sandor Atlantic Research Corporation 5390 Cherokee Avenue AlexandriaVA United States

Recent advances in high power lasers with their optically active media at supersonic flow conditions require experimental gain measurements to be performed under difficult conditions. The spatial inhomogeneities and their rapid temporal variations cannot be prescribed analytically;their effect on the accuracy of measured gain values can only be estimated. In the cases of media with low gain values (typically in the order of 0.1 to 1.0 percent per cm) inaccuracies resulting from time varying optical inhomogeneities may completely mask the data when conventional gain measuring techniques are used. The present paper describes a method that was developed at Atlantic Research Corporation with IR&D funds to eliminate the problem as described above. The system has several unique features: 1. By appropriate design of the optical train, the influence of rapid variations of inhomogeneities of the optically active medium on roundtrip gain measurements are effectively eliminated. This feature is maintained throughout a wide range of inhomogeneities such as is experienced in well-designed gas dynamic and chemical lasers. 2. A single detector sequentially monitors a reference level, the signal itself, and an off condition. High frequency noise components of the probe laser are eliminated by a synchronous detector with variable RC constant;the low frequency noise components are eliminated by ratio taking. 3. A unique optical arrangement allows complete elimination of laser radiation feedback into the probe laser allowing quiet laser operation. The above system can be operated in any portion of the optical spectrum. It has been operating at Atlantic Research Corporation at 10 microns with a total resolution of roundtrip gain of better than 1 percent. © Proceedings of SPIE - The International Society for optical engineering. All rights reserved.

关键词： Refractive index

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Recent developments of the laser in medicine

Recent developments of the laser in medicine

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Quantitative Imagery in the Biomedical Sciences ii 1973

作者： Goldman, Leon Laser Laboratory Medical Center University of Cincinnati Ohio United States

With the low priority for R and D, research and development, for laser applications in medicine, it is surprising that any current report of progress could be developed. However, still in an all too limited phase, laser medicine continues in this country both for diagnosis and treatment other than for diseases of the eye. (Ref. 1, 2). Fortunately,there is increased activity both in laser biology and medicine in Europe and Russia at the present time. A laser cancer treatment institute has been established in Kiev, Russia. West Germany has plans to develop a laser institute of biology and medicine through the Gesllschaft fur Strahlen and Umweltforschung. So progress in this important field of laser applications will be continued at least, if not here. It is not recognized by those who have withdrawn funding for basic research that research in biology and medicine helps to develop programs for laser safety. With effective programs of laser safety, the field of applications of the laser has expanded and will continue to expand. Work in laser biology is necessary for progress in laser medicine.

关键词： Laser applications Laser development Laser therapeutics Medicine Surgery Biology Cancer Laser systems engineering Carbon dioxide lasers Laser safety

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New developments in the design of holographic optics

New developments in the design of holographic optics

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Applications of Geometrical Optics ii 1973

作者： Latta, John N. Fairchild, Ronald C. Environmental Research Institute of Michigan Ann ArborMI United States Willow Run Laboratories University of Michigan United States

Conventional optics normally includes only two types of elements: refractive and reflective. Holographic optics encompasses a third type of element;one whose properties are diffractive in nature. The focus of this paper is to outline the properties of a general computer-based analysis and design tool that is directed to holographic optics. This tool is called the Holographic Optics-Analysis and design (HOAD) program. The program has been designed to be both user oriented and flexible. Four sections are covered in the paper. They are directed towards (1) the operating system (MTS) used to support the HOAD program, (2) the hologram ray tracing programs which form the basis of the program, (3) a general discussion of the HOAD program, and (4) an outline of the techniques of using HOAD. The last section of the paper is directed towards an assessment of where HOAD presently stands and the direction it is going. © 1974 SPIE. All rights reserved.

关键词： Holograms

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Use of HE-NE lasers in the construction and building industry

Use of HE-NE lasers in the construction and building industr...

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developments in Laser Technology ii 1973

作者： Steele, James O. Engineering Laser Systems Division Spectra-Physics Incorporated Mountain ViewCA United States

Since the commercial introduction of the gas Laser in the early 1960's, various industries (not including pure scientific research) have attempted to adopt the coherent light source as a standard tool. By far, the most successful attempt to date has been the use of the low powered He-Ne Laser in the construction industry for alignment purposes. The properties of the He-Ne Laser makes it ideal for the construction industry: Relative Low Cost High Single-Mode Stability Portability--low input power requirement from 12 VDC source Ruggedness of design of Internal Mirror Plasma Tube In turn, the construction industry needs are ideal for low-powered He-Ne Lasers: Stable, Long Distance Reference Line Reference Line Not Requiring Operator Improved Accuracy Improved Efficiency

关键词： Laser marking Laser development Helium neon lasers Laser stabilization Laser systems engineering Gas lasers Physics Plasma Light sources Scientific research

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A low-light-level objective lens with integral laser channel

A low-light-level objective lens with integral laser channel

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developments in Electronic Imaging Techniques ii 1972

作者： Yoder, P.R. Friedman, I. Perkin-Elmer Corporation NorwalkCT United States

The development of the electro-optical image intensifier tube has created a need for new lens objectives uniquely designed for low-light-level applications,. Such lenses frequently resemble those intended for aerial reconnaissance purposes, but they have certain important design features that make them dif-ferent from their photographic counterparts.

关键词： Lens design Monochromatic aberrations Objectives Prisms optical design optical coatings Image intensifiers Colorimetry Mirrors Vignetting

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An electron-lens for opaque photocathodes

An electron-lens for opaque photocathodes

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developments in Electronic Imaging Techniques ii 1972

作者： Johnson, C.B. Hallam, K.L. Bendix Research Laboratories SouthfieldMI United States Goddard Space Flight Center GreenbeltMD United States

For many years image tubes have been made which use semitransparent photocathodes to conveniently separate the optical and electro-optical functions. It is now possible to employ opaque photocathodes in image tubes having a special electromagnetic lens, without the use of special internal image forming optical lenses or mirrors. The design of this special electron-lens and measurements of some of its characteristics are discussed in succeeding sections.

关键词： Magnetism Opacity Image intensifiers Image quality Electromagnetism Mirrors Electrodes Electro optics Lens design Vacuum ultraviolet

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The design of a laser interferometer for image tube resolution measurements

The design of a laser interferometer for image tube resoluti...

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developments in Electronic Imaging Techniques ii 1972

作者： Zeisse, C.R. Naval Electronics Laboratory Center San DiegoCA United States

The optical transfer function of an optical component such as a lens or image tube is of great importance because this one function, together with any scene entering the lens, can be used to predict the scene leaving the lens. The concept of the optical transfer function, which is the product of a phase transfer function and a modulation transfer function (MTF) has been well described in the literature (Ref. 1). The analogous situation in electronics is that of an arbitrary waveform entering a linear electronic black box. Armed only with the transfer function, the engineer can predict the output waveform in the following way: the input waveform is decomposed into its Fourier components, each component is multi-plied by the value of the transfer function at that frequency, and the result is summed over all frequencies. The transfer function changes the amplitude and shifts the phase of each Fourier component.

关键词： Modulation transfer functions Spatial frequencies Interferometers Mirrors Beam splitters Photography Electronics Michelson interferometers Video Visibility

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developments in Electronic Imaging Techniques ii

Developments in Electronic Imaging Techniques II

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developments in Electronic Imaging Techniques ii 1972

The proceedings contain 22 papers. The topics discussed include: image transfer characteristics of image intensifier tubes;capabilities and limitations of infrared imaging systems;precise signal and noise measurements of video waveforms;the design of a laser interferometer for image tube resolution measurements;a real-time simulator for image data systems;ultra high resolution electronic imaging and storage with the return beam VIDICON;an electron-lens for opaque photocathodes;a low- light -level objective lens with integral laser channel;and ground surveillance with an active LLLTV.

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Data Analysis in Astronomy ii 1

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丛书名： Polymer Science and Technology Series

1000年

作者： V. Gesù L. Scarsi P. Crane J. H. Friedman S. Levialdi

ISBN: (数字)9781461322498

ISBN: (纸本)9780306424731;9781461293170

The ii international workshop on "Data Analysis in Astronomy" was intended to provide an overview on the state of the art and the trend in data analy sis and image processing in the context of their applications in Astronomy. The need for the organization of a second workshop in this subject derived from the steady. growing and development in the field and from the increasing cross-interaction between methods, technology and applications in Astronomy. The book is organized in four main sections: - Data Analysis Methodologies - Data Handling and Systems dedicated to Large Experiments - Parallel Processing - New developments The topics which have been selected cover some of the main fields in data analysis in Astronomy. Methods that provide a major contribution to the physical interpretation of the data have been considered. Attention has been devoted to the description of the data analysis and handling organization in very large experiments. A review of the current major satellite and ground based experiments has been included. At the end of the book the following 'Panel Discussions' are included: - Data Analysis Trend in optical and Radio Astronomy - Data Analysis Trend in X and Gamma Astronomy - Problems and Solutions in the design of Very Large Experiments - Trend on Parallel Processing Algorithms These contributions in a sense summarize the 'live' reaction of the audience to the various topics.

关键词： Astronomy, Astrophysics and Cosmology Statistics for engineering, Physics, Computer Science, Chemistry and Earth Sciences

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High resolution portable holocamera

High resolution portable holocamera

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developments in Holography ii 1971

作者： Close, D.H. Hughes Research Laboratories MalibuCA United States

A disadvantage of optical holog raphy has been that the sensitivity to movement and the coherence requirements for hologram recording ordinarily lead to rather large and massive systems and/or lasers. In this paper we describe a portable hologram micro scope which uses a small, reliable pulsed ruby laser light source to overcome this disadvantage. This instrument was designed to record images of rough, diffusely reflecting surfaces with a resolution of 5 pm or better.

关键词： Holograms Holography Photography Speckle Image resolution Microscopes Image quality Diffusers Relays optical design

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