Photonics/Optics

Method of Reducing Stray Energy Burns in Laparoscopic Surgery

Active Electrode Monitoring (AEM) instruments incorporate a “shielded and monitored” design to lower risk of injury.Any surgery brings with it risk, both to the patient and the surgeon. However, laparoscopic surgery sometimes brings an additional invisible risk: stray energy burns. Electrosurgical devices and laparoscopic instruments can suffer insulation failures and capacitive coupling, potentially causing stray energy burns to the patient. Often these burns occur out of sight of the surgeon and may go unnoticed until the patient presents with symptoms like peritonitis or sepsis.

Posted in: Bio-Medical, Briefs, Briefs, Surgical Robotics/Instruments, Lasers & Laser Systems, Photonics

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Adhesives for Optical Assembly

Adhesives deliver excellent performance on a range of materials used to manufacture optical components, including glass, metal, ceramic and most plastics. By their very nature, adhesives allow devices to be made stronger, faster, and more cost-effectively, living up to the most basic demands of the marketplace.

Posted in: Articles, Features, ptb catchall, Photonics

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Visible Imager Technology for Euclid’s Dark Energy Mission

The European Space Agency is funding e2v’s development of an image sensor for the visible instrument in the Euclid space telescope. Euclid is a candidate mission for one of two launch opportunities in 2018. If selected, the mission aims to map the dark universe with two complementary methods: a galaxy red-shift survey and weak gravitational lensing using near infrared and visible instruments.

Posted in: Application Briefs, Applications, ptb catchall, Photonics

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n-B-pi-p Superlattice Infrared Detector

A specially designed barrier (B) is inserted at the n-pi junction [where most G-R (generation-recombination) processes take place] in the standard n-pi-p structure to substantially reduce generation-recombination dark currents. The resulting n-B-pi-p structure also has reduced tunneling dark currents, thereby solving some of the limitations to which current type II strained layer superlattice infrared detectors are prone. This innovation is compatible with common read-out integrated circuits (ROICs).

Posted in: Photonics, Briefs, ptb catchall, Tech Briefs, Photonics

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Monolithic, High-Speed Fiber-Optic Switching Array for Lidar

Electro-optic crystals allow for fast, multi-fiber switching without moving parts.Current fiber switch technologies use mechanical means to redirect light beams, resulting in slow switch time, as well as poor reliability due to moving parts wearing out quickly at high speeds. A non-mechanical ability to switch laser output into one of multiple fibers within a fiber array can provide significant power, weight, and costs savings to an all-fiber system.

Posted in: Mechanics, Briefs, TSP, ptb catchall, Tech Briefs, Photonics

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Radius of Curvature Measurement of Large Optics Using Interferometry and Laser Tracker

This method determines the curvature radius of large mirrors.The determination of radius of curvature (ROC) of optics typically uses either a phase measuring interferometer on an adjustable stage to determine the position of the ROC and the optics surface under test. Alternatively, a spherometer or a profilometer are used for this measurement.

Posted in: Briefs, TSP, ptb catchall, Tech Briefs, Photonics

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Creep Measurement Video Extensometer

This automated system measures test-sample creep rates for materials testing.Understanding material behavior under load is critical to the efficient and accurate design of advanced aircraft and spacecraft. Technologies such as the one disclosed here allow accurate creep measurements to be taken automatically, reducing error.

Posted in: Briefs, TSP, ptb catchall, Tech Briefs, Photonics

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