Photonics/Optics

Partitioned-Interval Quantum Optical Communications Receiver

The receiver structure described here improves upon the performance of optical communications links, achieving high sensitivity and high data rates even with extremely weak optical signals.

The proposed quantum receiver in this innovation partitions each binary signal interval into two unequal segments: a short “pre-measurement” segment in the beginning of the symbol interval used to make an initial guess with better probability than 50/50 guessing, and a much longer segment used to make the highsensitivity signal detection via field-cancellation and photon-counting detection. It was found that by assigning as little as 10% of the total signal energy to the pre-measurement segment, the initial 50/50 guess can be improved to about 70/30, using the best available measurements such as classical coherent or “optimized Kennedy” detection.

Posted in: Briefs, Tech Briefs, Photonics, Optics, Telecommunications
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Cobra Fiber-Optic Positioner Upgrade

This technology could be used for applications requiring precise location of a small object within a small circular area, such as in medical lasers.

A prime focus spectrometer (PFS), along with corrective optics, will mount in place of the secondary mirror of the Subaru telescope on Mauna Kea, Hawaii. This will allow simultaneous observations of cosmologic targets. It will enable large-scale galactic archeology and dark energy surveys to help unlock the secrets of the universe.

Posted in: Briefs, Tech Briefs, Photonics, Fiber optics, Spectroscopy
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Practical UAV Optical Sensor Bench With Minimal Adjustability

A multiple-pass optical platform eliminates essentially all optical alignment degrees of freedom, save one. A fourpass absorption spectrometer architecture is made rigid by firmly mounting dielectric-coated mirror prisms with no alignment capability to the platform. The laser diode beam is collimated by a small, custom-developed lens, which has only a rotational degree of freedom along the standard optical “z” axis. This degree is itself eliminated by adhesive after laser collimation. Only one degree of freedom is preserved by allowing the laser diode chip and mount subassembly to move relative to the collimating lens by using over-sized mounting holes. This allows full 360° motion of a few millimeters relative to the lens, which, due to the high numerical aperture of the lens, provides wide directional steering of the collimated laser beam.

Posted in: Briefs, TSP, Photonics, Physical Sciences, Lasers, Optics, Sensors and actuators, Unmanned aerial vehicles
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Optical Thin Films on Complex Substrate Geometries

Anext-generation low pressure chemical vapor deposition (LPCVD) optical thin film coating process is permitting the manufacture of interference filter coatings, such as single wavelength, dual band and broadband AR, cold mirror, dichroic, and conductive. The enhanced thin film IsoDyn™ process, designed by Deposition Sciences, Inc. (DSI) is now being used to produce conformal coatings on complex substrate geometries. This capability allows for a myriad of new applications that may require uniform, multilayer coatings on complex shapes, ranging from simple ball lenses to almost any imaginable optical shape.

Posted in: Articles, Features, Photonics, Optics, Chemicals, Coatings, colorants, and finishes, Materials properties
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Solar Powered UAVs

The use of unmanned aerial vehicles (UAVs) has been increasing worldwide as demands for agile, rapid, targeted response forces have grown. UAVs provide surveillance and detection capabilities to these smaller forces that are unmatched by other technologies. As the reliance on UAVs increases, the short endurance times of existing UAV solutions become a significant factor. Existing commercial solutions have endurance ranging from 45 minutes to 4 hours, limiting both operational range and loiter capabilities. To increase endurance, UAV manufacturers have begun to target technologies ranging from increased performance batteries, improved control algorithms, fuel cells and other alternative power sources. While solar powered UAVs have long been a desired goal, existing solar technologies have characteristics that have made solar integration difficult and limited their integration.

Posted in: Application Briefs, Applications, Photonics, Solar energy, Jet engines, Unmanned aerial vehicles
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633nm Red Lasers

The new TopMode laser from TOPTICA Photonics, Inc. (Victor, NY) features proprietary CoHerence-Advanced Regulation Method (CHARM) technology that provides active stabilization of the lasers’ coherence. The TopMode laser provides 30 mW at 633nm (free beam).

Posted in: Products, Products, Photonics
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CMOS Sensor

Truesense Imaging (Rochester, NY) recently announced its first CMOS image sensor specifically targeting applied imaging markets such as machine vision, intelligent transportation systems, and surveillance. With 12 million pixels (4000 x 3000) in a 4/3 optical format, the KAC-12040 supports 8, 10, 12, and14-bit output, providing 10-bit full resolution readout at up to 60 frames per second. Higher frame rates are possible through image cropping, including a pre-programmed Quad Full HD (3840 x 2160, 8.3 MPix) mode that supports 10-bit readout at 100 fps. The architecture of the device enables 2, 4, or the full set of 8 output banks to be selected during readout, allowing power to be conserved when very fast throughput is not required. Based on an advanced 4.7-micron pixel, the new CMOS platform provides both global and rolling shutter for versatile image capture, very high frame rate, and excellent near-IR sensitivity – features required by a growing set of applied imaging applications such as machine vision, intelligent transportation systems, and surveillance.

Posted in: Products, Products, Photonics
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Tactical Fiber Optic Connectors

TE Connectivity (TE) (Harrisburg, PA) announced that their PRO BEAM Jr. expanded-beam tactical fiber optic connectors have achieved qualification to U.S. government standard MIL-DTL-83526/20 and /21. This interface is a derivative of TE’s PRO BEAM Jr. connector. This achievement, coupled with the VG 95319-100 and - 101 specification will provide the first global tactical fiber optic specification for the rugged market. The PRO BEAM Jr. line is a rugged fiber optic interconnect system that protects the core of the fiber behind “safety glasses” and is engineered to survive the most extreme operating conditions in harsh environments. The interconnect system is easy to use and deploy, and cuts back the cost of ownership by eliminating up to 95 percent of Maintenance Repair and Overhaul activity. The MIL-DTL-83526/20 and /21 provide a QPL resource for assured high performance within rugged field-deployed, cross-field communications links.

Posted in: Products, Products, Photonics
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IX3 Breadboard and Filter Wheel Assembly

Prior Scientific (Rockland, MA) announced a new IX3 breadboard and filter wheel assembly for Olympus IX3 inverted microscope systems. Taking full advantage of the open access to the light path on the Olympus IX3 microscope, the IX3 breadboard and HF108SIX3 filter wheel module can be mounted and removed with ease. The combination is compatible with the IX3-ZDC module. Available as a separate part, the HP1719breadboard allows researchers to mount and insert any number of custom optics into the IX3 light path to create their own unique system. Having the filter wheel mounted below the nosepiece allows the user to not only switch between wavelengths at high speed, but also to see the fluorescent images through the eyepieces of the IX3 microscope as well as the camera. The HF108SIX3 filter wheel accommodates up to eight 32mm diameter filters. Drivers are available for cellSens and Metamorph software packages.

Posted in: Products, Products, Photonics
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2MP Night Vision IP Camera

TRENDnet (Torrance, CA) recently announced a new 2-Megapixel PoE Day/ Night Dome Internet Camera, model TVIP262PI- A. The tamper resistant TV-IP262PI produces vivid 1280 x 1024 pixel (H.264 compression format) video in complete darkness for distances of up to 12 meters (40 feet). Manually pan the camera side-to-side and tilt it up-and-down to fix its final viewing position. Power and data are received through a single Ethernet cable using Power over Ethernet (PoE) technology. Integrated cabling allows for easy wall / ceiling mounting and the off-white IP camera housing blends into most environments. Other features include two-way audio support (mic and speaker sold separately), date/time text overlay, mask overlay to conceal sensitive areas, and image flip capabilities for upside down installations.

Posted in: Products, Products, Photonics
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