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Briefs: Photonics/Optics
Wide-aperture receivers for free-space optical communication systems would utilize Fresnel lenses instead of conventional telescope lenses, according to a proposal. Fresnel lenses weigh and...
Briefs: Photonics/Optics
A system has been developed to replace manual measurement of small jet engine blades during safety and performance inspections. The high-speed, automated system consists of...
Briefs: Photonics/Optics
Small, inexpensive, hand-held optoelectronic color-measuring devices based on metal-film/dielectric-film interference filters are undergoing development. These color meters could be suitable...
Briefs: Electronics & Computers
The ambient-light-canceling camera (ALCC) is a proposed near-infrared electronic camera that would utilize a combination of (1) synchronized illumination during alternate frame periods...
Briefs: Photonics/Optics
A compact, dual-frequency, dual-polarization, wide-angle-scanning antenna system has been developed as part of an airborne instrument for measuring rainfall. This system is an upgraded...
Briefs: Photonics/Optics
The thinning stage of the postfabrication process reported in the immediately preceding article is notable in its own right. Although the thinning process was described in the preceding...
Briefs: Photonics/Optics
An improved process that includes a high-temperature bonding subprocess has been developed to enable the fabrication of robust, flat, silicon-based charge-coupled devices (CCDs) for imaging...
Briefs: Photonics/Optics
In a recent improvement upon InxGa1- xAs/InP semiconductor lasers of the bipolar cascade type, quantum wells are added to Esaki tunnel junctions, which are standard parts of such...
Briefs: Photonics/Optics
Improved Refractometer for Measuring Temperatures of Drops
The Dual Rainbow refractometer is an enhanced version of the Rainbow refractometer, which is added to, and extends the capabilities of, a phase Doppler particle analyzer (PDPA). A PDPA utilizes pairs of laser beams to measure individual components of velocity and sizes of drops in a spray....
Briefs: Photonics/Optics
Phytoplankton-Fluorescence-Lifetime Vertical Profiler
A battery-operated optoelectronic instrument is designed to be lowered into the ocean to measure the intensity and lifetime of fluorescence of chlorophyll A in marine phytoplankton as a function of depth from 0 to 300 m. Fluorescence lifetimes are especially useful as robust measures of...
Briefs: Photonics/Optics
An experimental tunable, narrowband-pass electro-optical filter is based on a whispering-gallery resonator. This device is a prototype of tunable filters needed for the further development...
Briefs: Photonics/Optics
Advances in the development and manufacturing of photonic processors have reached a critical stage where their mass applications are becoming commercially viable. LNL...
Briefs: Photonics/Optics
A versatile and simple approach to the design and fabrication of curved-focal-plane arrays of silicon-based photodetectors is being developed. This approach is an alternative to...
Briefs: Photonics/Optics
Under a DARPA program known as Steered Agile Beams (STAB), novel liquid-crystal devices are being developed by Rockwell Scientific Company (RSC) to...
Briefs: Photonics/Optics
Gray-scale x-ray lithography is undergoing development as a technique for fabricating blazed diffraction gratings. As such, gray-scale x-ray lithography now complements such other...
Briefs: Photonics/Optics
A versatile electronic timing-and-control unit, denoted a rotorcraft strobe controller, has been developed for use in controlling stroboscopes, lasers, video cameras, and other instruments...
Briefs: Photonics/Optics
A proposed method of measuring gravitational acceleration would involve the application of polarization spectroscopy to an ultracold, vertically moving cloud of atoms (an atomic fountain). A...
Briefs: Energy
A modular, integrated, completely solid-state system designed to harvest and store solar energy is under development. Called the "power tile," the hybrid device consists of a photovoltaic...
Briefs: Photonics/Optics
A charge-coupled-device (CCD) based high-speed imaging system, called a real-time, event-driven (RARE) camera, is undergoing development. This camera is capable of readout from multiple...
Briefs: Photonics/Optics
There has long been a desire to deposit conductive paths directly on molded plastic structures, combining the electrical and mechanical functions in one...
Briefs: Photonics/Optics
Specially formulated diffusion filter materials have successfully optimized the legibility of miniature display viewing areas, providing brighter and more enhanced images for a...
Briefs: Photonics/Optics
A proposed method of implementing cross connections in an optical communication network is based on the use of a spatial light modulator (SLM) to form controlled diffraction patterns that...
Briefs: Photonics/Optics
Optical assemblies are used in an extensive range of technical applications to deliver a laser beam of a certain size, quality, and intensity to a region of space. While different...
Briefs: Photonics/Optics
Piezoelectric diffraction-based optoelectronic devices have been invented to satisfy requirements for switching signals quickly among alternative optical paths in optical communication networks....
Briefs: Photonics/Optics
A design concept has been proposed for an optomechanical apparatus that would implement a variable optical delay line with a fixed angle between its input and output light beams. The apparatus...
Briefs: Photonics/Optics
Mode-locked lasers of a proposed type would incorporate features of the design and operation of previously demonstrated miniature electro-optical modulators and erbium-doped glass lasers that contain...
Briefs: Photonics/Optics
A method of observing the interdiffusion of a pair of miscible liquids is based on the use of a common-path interferometer (CPI) to measure the spatially varying gradient of the...
Briefs: Photonics/Optics
A proposed method of suppressing the effect of background noise in an optical communication system would exploit the transmission and reception of correlated photons at the receiver. The...
Briefs: Photonics/Optics
Curved-focal-plane arrays of back-illuminated silicon-based photodetectors are being developed. The basic idea is to improve the performance of an imaging instrument...
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