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Procedures for Tuning a Multiresonator Photonic Filter

A desired high-order filter function can be established and maintained. NASA’s Jet Propulsion Laboratory, Pasadena, California Two procedures have been devised for tuning a photonic filter that comprises multiple whispering-gallery-mode (WGM) disk resonators. As used here, “tuning” signifies locking the filter to a specific laser frequency and configuring the filter to obtain a desired high-order transfer function.

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

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Extended-Range Ultrarefractive 1D Photonic Crystal Prisms

Practical applications could include miniature spectrometers and wavelength-division multiplexers. NASA’s Jet Propulsion Laboratory, Pasadena, California A proposal has been made to exploit the special wavelength-dispersive characteristics of devices of the type described in “One-Dimensional Photonic Crystal Superprisms” (NPO-30232) NASA Tech Angle of Incidence Briefs, Vol. 29, No. 4 (April 2005), page 10a. A photonic crystal is an optical component that has a periodic structure comprising two dielectric materials with high dielectric contrast (e.g., a semiconductor and air), with geometrical feature sizes comparable to or smaller than light wavelengths of interest.

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

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Robust Mapping of Incoherent Fiber-Optic Bundles

Images scrambled by the bundles can be unscrambled. Marshall Space Flight Center, Alabama A method and apparatus for mapping between the positions of fibers at opposite ends of incoherent fiber-optic bundles have been invented to enable the use of such bundles to transmit images in visible or infrared light. The method is robust in the sense that it provides useful mapping even for a bundle that contains thousands of narrow, irregularly packed fibers, some of which may be defective.

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

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Product of the Month: High-Power Microscope

FEI (Hillsboro, OR) has released the PhenomTM microscope, bridging the performance gap between optical and scanning electron microscope (SEM) technologies. Capable of yielding magnification up to 20,000× — 20 times higher than most advanced optical scopes — and with an ultimate resolution of 30nm, the Phenom addresses a wide variety of industrial and academic applications including quality assurance, product development, research, and testing.

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Optical Time Domain Reflectometer

Luna Technologies (Roanoke, VA) has announced the Optical Backscatter Reflectometer (OBRTM) 4400, an optical time domain reflectometer (OTDR) that can diagnose, locate, and troubleshoot problems in fiber optic components and assemblies such as splices, breaks, connectors, bends, and hot-spots. The OBR 4400 features micrometer spatial resolution, range to 2 km, and sensitivity of -130 dB. Integrated distributed sensing capability enables users to view the effects from component-level heating in optical amplifiers, monitor temperature inside cabinets and enclosures, and identify the location of fiber assemblies by touching the fiber. The OBR 4400 is also suitable for use in component manufacturing, aerospace installation and maintenance testing, mobile platforms, and secure networks.

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Modular LED Test System

Edmund Optics (Barrington, NJ) has released the MLED modular LED test and measurement systems available in three configurations for making measurements on discrete LEDs, arrays, and assemblies. The MLED-2 version includes a 2-inch diameter integrating sphere with a ½-inch diameter input port for making measurements on discrete devices. The MLED-6 system includes the MLED-2 along with a 6-inch integrating sphere assembly, and is suitable for intensity measurements of LEDs and for flux measurements of LED assemblies up to 1.5-inch in diameter. The MLED-12 system consists of the MLED-2 base and a 12-inch integrating sphere with 4-inch diameter port, and is suitable for flux measurements of larger LED assemblies and arrays. The MLED base systems consist of a 2048-element CCD spectrometer, an internal calibration lamp with power supply, and a set of three calibrated neutral density filters. The CCD spectrometer offers a resolution of 1.5 nm with 0.5 nm accuracy over a range of 350 to 1000 nm. The detector can measure luminous flux to 200 lumens using the OD2 filter. Exposure time ranges from 5 ms to 3 sec and stray light is 0.05% at 600 nm.

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Continuous Wave Laser

OSRAM Opto Semiconductors (Regensburg, Germany) has introduced a continuous wave laser offering thermal resistance of 2.5 K/W, an output of up to 6W, and a footprint measuring 6.0mm × 4.5 mm. It emits light at a wavelength of 810 nm through a prism that directs the laser’s light upwards. These capabilities allow the CW laser to be placed in any location on a circuit board. Operating temperature ranges from -40° to 100°C and the thermal conductivity of its base allows the laser unit to be soldered directly onto a metal core board. The system is suitable for volume applications such as night vision systems, closed circuit television, traffic monitoring, and medical applications.

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