An all acousto-optic infrared scene projector (IRSP) has been developed for use in evaluating thermal-imaging guidance systems at the Kinetic Kill Vehicle Hardware-in-the-Loop Simulator (KHILS) facility located at Elg...
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ISBN:
(纸本)081941249X
An all acousto-optic infrared scene projector (IRSP) has been developed for use in evaluating thermal-imaging guidance systems at the Kinetic Kill Vehicle Hardware-in-the-Loop Simulator (KHILS) facility located at Elgin AFB, Florida. The IRSP is a laser source based projector incorporating Scophony illumination and scanning methods to produce 96 X 96 pixel multi-wavelength images at very high frame rates (400 Hz). The IRSP is composed of five functionally similar optical trains, four of which are fed with a different `color' infrared laser. The separate scenes from each optical train are then combined and projected simultaneously into the imaging guidance system.
When gradient index rods (GI rods) were prepared by interfacial-gel copolymerization, the bulk polymerization caused serious shrinkage, which, in turn, resulted in inevitable defects. These defects in GI rods can be r...
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ISBN:
(纸本)081941249X
When gradient index rods (GI rods) were prepared by interfacial-gel copolymerization, the bulk polymerization caused serious shrinkage, which, in turn, resulted in inevitable defects. These defects in GI rods can be reduced by control of reaction conditions. Experimental results revealed that properly adjusting the reaction conditions such as concentrations of initiator, chain transfer agent, and/or temperature could reduce the viscosities of the reaction mixtures and could produce GI rods with a parabolic refractive index distribution.
The manufacture of complex multilayers requires the maker to have a satisfactory monitoring system. The monitoring system can control accuracy not only in optical thicknesses of nonquarterwave layers but can also comp...
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ISBN:
(纸本)081941249X
The manufacture of complex multilayers requires the maker to have a satisfactory monitoring system. The monitoring system can control accuracy not only in optical thicknesses of nonquarterwave layers but can also compensate deposition errors in real-time in order to secure a stable monitoring and eventually to achieve the desired optical performance. In this paper, a computer controlled apparatus for monitoring of wideband optical coatings is described. A method, based on performance measurements during the monitoring of a layer in situ, has been developed to determine the actual refractive index and thickness of the layer in vacuo. The method can be used as a means of detecting deposition errors.
We already discussed the bistable behavior of a Fabry Perot resonator filled with molecular media as well as the characteristics of a spatial light modulator (SLM) based on the nonlinearity induced by excited state ab...
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ISBN:
(纸本)081941249X
We already discussed the bistable behavior of a Fabry Perot resonator filled with molecular media as well as the characteristics of a spatial light modulator (SLM) based on the nonlinearity induced by excited state absorption. In the present paper we present two practical configurations. First we analyze a cavity-less bistable element which removes some of the realization problems related to high finess cavity. In this configuration the nonlinear medium is located in one arm of an optical interferometer. The scheme provides the required amount of positive feedback by the bistable mechanism -- but without a cavity. We applied the nonlinear eikonal approximation, a method which takes care of the detailed propagation effects, and obtained conditions for bistability, as well as optimizing the design parameters such as the output mirror reflectivity, etc.
optical systems are traditionally represented by a sequential series of `optical surfaces' that are ordered in the same manner experienced by light traveling from an object to an image point through the system. Th...
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ISBN:
(纸本)081941249X
optical systems are traditionally represented by a sequential series of `optical surfaces' that are ordered in the same manner experienced by light traveling from an object to an image point through the system. The actual system is composed of 3-D components which include these `active optical surfaces' as the external surface of the component. Modern simulation technology is based on solid modeling which provides a very close representation to the actual system and enables computer integrated manufacturing by being accurate and comprehensive enough for fabrication. The classical method to analyze an optical system is based on ray tracing, a technique based on geometrical optics where light propagation is assumed to be simulated by rays from the object to the image point. Each ray is represented by a linear vector traveling through the system to the evaluation plane by iterations. Each step calculates the propagation between two successive surfaces in a sequential order. The shift from `sequential surfaces' representation to `solid models,' which changes the classical method of ray tracing, but offers a variety of new analytical opportunities, is discussed.
Recent advances in axial gradient material fabrication via the diffusion of glass plates has opened the door to a wide variety of opticaldesign applications incorporating entire lenses of gradient index material. A p...
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ISBN:
(纸本)081941249X
Recent advances in axial gradient material fabrication via the diffusion of glass plates has opened the door to a wide variety of opticaldesign applications incorporating entire lenses of gradient index material. A proprietary software-driven process developed at LightPath Technologies Inc. creates gradient index glass by fusing together a stack of discrete glass plates, where each constituent plate has a distinctive composition and desired optical properties. LightPath's ability to prescribe large optical index changes (up to 0.47) throughout a glass substrate of virtually any diameter and thickness (macro gradient), invokes an interesting question: what are the properties of a solid gradient index lens and how can these properties be used most efficiently and effectively? This paper reports on a parametric study of third order spherical aberration vs. shape factor, for a macro gradient F/3 singlet lens whose index varies by ± 0.4 in linear, quadratic and cubic profiles.
Beam agility for large aperture optical systems has proven to be a challenging engineering problem. This paper describes opticalengineering issues of an agile, 1/2 meter aperture, 30° field of regard telescope. ...
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ISBN:
(纸本)081941249X
Beam agility for large aperture optical systems has proven to be a challenging engineering problem. This paper describes opticalengineering issues of an agile, 1/2 meter aperture, 30° field of regard telescope. Key system tradeoffs considered in the opticaldesign are discussed.
Photon Dynamics' IPT system provides high throughput and excellent voltage measurement sensitivity on an AMLCD panel. It is based upon an electro-optical technology to measure the voltage stores on an LCD pixel of...
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ISBN:
(纸本)081941249X
Photon Dynamics' IPT system provides high throughput and excellent voltage measurement sensitivity on an AMLCD panel. It is based upon an electro-optical technology to measure the voltage stores on an LCD pixel of an AMLCD active plate. This paper discusses the system performance requirements. From these we derive the optical subsystem requirements. The opticaldesign form and its performance are presented. The current system status, system design issues, and the future improvements also are discussed.
A photographic objective employing axial gradient-index (GRIN) elements is described and compared with a conventional double Gauss lens. Comparable imaging performance and increased relative illumination at the edge o...
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ISBN:
(纸本)081941249X
A photographic objective employing axial gradient-index (GRIN) elements is described and compared with a conventional double Gauss lens. Comparable imaging performance and increased relative illumination at the edge of field are realized in the GRIN design even though it has fewer optical elements.
Using the Lockheed in-house computer program OPTIMA for opticaldesign and analysis, a facility has been implemented which enables the opticaldesigner to target any performance parameter at any temperature in the ran...
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ISBN:
(纸本)081941249X
Using the Lockheed in-house computer program OPTIMA for opticaldesign and analysis, a facility has been implemented which enables the opticaldesigner to target any performance parameter at any temperature in the range of interest. A database with thermal properties of the optical materials was added to the program along with routines facilitating the evaluation of an optical system at arbitrary temperatures. In the optimization section of the program, alternate lens configurations are used to represent the lens at different temperatures. During the optimization the program automatically changes temperature and computes the requested performance parameters at the desired temperatures. Applications for this method include the design of high-performance camera objectives optimized for a large temperature range.
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