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Green Laser Diode Modules

A line of green laser diode modules available from BEA Lasers (Elk Grove Village, IL) is suitable for spectroscopy, particle measurement, medical tissue analysis, interferometry, holography, robotic control, and flow visualization. The Model 2501 is a fixed-focus CW diode pumped laser diode module with a beam divergence of

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Vibration Isolation Workstation

Kinetic Systems (Boston, MA) offers the MK26 vibration isolation workstation for ultra-low natural frequency applications. It utilizes the Minus K® vertical isolator, which uses a stiff spring and a negative-stiffness mechanism to provide vertical stiffness without affecting the static load-supporting capability. Horizontal isolation is provided by beam columns connected in series with the vertical-motion isolator. Adjusted to a 1/2-Hz natural frequency, the workstation can achieve 93% isolation efficiency at 2 Hz, 99% at 5 Hz, and 99.7% at 10 Hz. The MK26 is available with a 650-pound gross load capacity. Optional equipment includes guard rails, non-isolated shelves, Faraday cages, and tabletop enclosures. Applications include analytical balances, cell injection, confocal microscopes, patch clamping, optical microscopes, wafer probing, sensor calibration, and atomic force microscopes.

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Diode Laser System

TOPTICA Photonics AG (Graefelfing, Germany) offers the TA 100 single-mode output diode laser and amplifier systems, which may serve as a replacement for dye- or frequency-doubled solidstate lasers. The red-wavelength lasers provide a sensing range of 660 to 673 nm and an output power of 250 mW. The amplifier systems provide a sensing range of 660 to 1,080 nm with power up to 1 Watt. They offer single spatial and spectral mode output, narrow line width, and tenability. They can boost the output power of diode or gas lasers by a factor of 100. Applications include interferometry, holography, Raman spectroscopy, and atom cooling and trapping. The systems also enable accessibility to the resonance line of Lithium at 671 nm.

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Molded Glass Lenses

Moulded Optics GmbH (Schoffengrund, Germany) offers single-sided rod and blank-molded aspheric lenses made of crown, borosilicate, and high-refractive glass materials in diameter sizes from 2 mm to 100 mm. The aspheric first surface is molded and the spherical second surface is either ground and polished or molded. The lenses are suitable for laser diode collimating and focusing, digital projection, and microscopic measurement. Also available are molded half-ball lenses made from B270, borosilicate, and F2 class materials, available in diameter sizes of 3, 4, 5, and 6 mm, with standard, truncated, and extended center thickness. The hemisphere first surface is molded and the plano second surface is ground and polished. Applications include LED lighting, fiber communications, endoscopy, microscopy, optical pickup devices, and laser measurement systems.

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Measuring Vapors To Monitor the State of Cure of a Resin

Excess curing time would no longer be needed as margin against uncertainty. A proposed noninvasive method of monitoring the cure path and the state of cure of an epoxy or other resin involves measurement of the concentration(s) of one or more compound(s) in the vaporous effluent emitted during the curing process. The method is based on the following general ideas:

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Templates for Fabricating Nanowire/Nanoconduit-Based Devices

Prior templating processes are being extended to finer spatial resolutions. An effort is underway to develop processes for making templates that could be used as deposition molds and etching masks in the fabrication of devices containing arrays of nanowires and/or nanoconduits. Examples of such devices include thermoelectric devices, nerve guidance scaffolds for nerve repair, photonic-band-gap devices, filters for trapping microscopic particles suspended in liquids, microfluidic devices, and size-selective chemical sensors. The technology is an extension of previous work conducted by JPL, UCSD (University of California, San Diego), and Paradigm Optics Inc., which developed a process to fabricate macroporous scaffolds for spinal-cord repair.

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Reducing Centroid Error Through Model-Based Noise Reduction

Corrections are made for bias and noise.A method of processing the digitized output of a charge-coupled device (CCD) image detector has been devised to enable reduction of the error in computed centroid of the image of a point source of light. The method involves model-based estimation of, and correction for, the contributions of bias and noise to the image data. The method could be used to advantage in any of a variety of applications in which there are requirements for measuring precise locations of, and/or precisely aiming optical instruments toward, point light sources.

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