Stories
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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: Photonics/Optics
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...
Articles: Photonics/Optics
Controlled Ultraviolet (UV) laser ablation is a viable method of micro-machining micro-electro-mechanical systems (MEMS) and micro-optical-electro-mechanical systems (MOEMS). It enables users 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: Photonics/Optics
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...
Articles: Photonics/Optics
The advantages of cladding pumping fiber lasers were identified early in the research era of fiber laser technology. Essentially, fiber lasers allow efficient brightness conversion from the broad area pump laser diode into a...
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