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Efficient Coupler for a Bessel Beam Dispersive Element
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Date added: 05/01/2008 |
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Here we propose and demonstrate new coupling technique which allows to couple free Gaussian beam to Bessel beam waveguide with very high efficiency. The problem of optical coupling to very small Bessel beam tapers is solved, and solution was experimentally demonstrated. |
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Compact Dielectric-Rod White-Light Delay Lines
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Date added: 05/01/2008 |
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Dielectric rod made of any transparent material such as CaF2, fused SiO2 or sapphire is the core element for white light delay line. High momentum Bessel-beam mode in the rod has low group velocity. |
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Single-Mode WGM Resonators Fabricated by Diamond Turning
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Date added: 05/01/2008 |
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We report on the upgrade of WGMRs representing a qualitatively new structure, a single mode WGMR. A diamond turning process is used in deterministic and reproducible
fabrication of the resonating microstructures. The new resonators are (i) ultra high optical Q factor, (ii) compact (tens to thousands of micrometer in diameter), and (iii) inherently single mode devices. Moreover, when made with an optical crystal, these resonators have
increased robustness and versatility. |
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Fiber-Optic Determination of N2, O2, and Fuel Vapor in the Ullage of Liquid-Fuel Tanks
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Date added: 05/01/2008 |
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A fiber optic sensor system is described that remotely measures the concentration of molecular oxygen, nitrogen, hydrocarbon vapor, and other gases in the ullage of a liquid fuel tank. The system is simple, compact, lightweight, and can be made robust and reliable for aircraft use. Furthermore, this sensor technology does not present an intrinsic fire or explosion safety hazard compared to electrically-based sensors that require wiring. |
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Spin-Stabilized Microsatellites With Solar Concentrators
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Date added: 03/01/2008 |
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This work shows a new architecture for micro-satellites. Addition of a concentrator system allows the amount of power generated to be increased manyfold. |
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Shaping Diffraction-Grating Grooves to Optimize Efficiency
hot!
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Date added: 03/01/2008 |
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In this work, we have shown for the first time that the grating grove profile itself can be designed to generate an optimized arbitrary desired spectral response. This is not only beneficial in terms of the flexibility to tailor the spectral efficiency but also one single grating can be used to contribute to the whole spectral range. |
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WRATS Integrated Data Acquisition System
hot!
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Date added: 03/01/2008 |
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The WRATS data acquisition system (DAS) is a 64 channel data acquisition, display, and analysis system specifically designed for use with the Wing and Rotor Aeroelastic Test System (WRATS) 1/5-scale V-22 tiltrotor model. The system consists of three networked computers running custom-designed LabView software that acquire data through National Instruments data acquisition hardware. |
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Compact Two-Dimensional Spectrometer Optics
hot!
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Date added: 02/01/2008 |
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A compact 2D spectrometer is described that combines the use of an integrated optical device originally developed for the telecommunications market with a grating to achieve high frequency resolution over a wide spectrum. |
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Spatial Combining of Laser-Diode Beams for Pumping an NPRO
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Date added: 01/02/2008 |
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This design combines the light from 5 high power multimode laser diodes into a single optical fiber using spatial beam combining. This approach uses astigmatic and
axially symmetric beam shaping optics to perform this task. |
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Optimized Geometry for Superconducting Sensing Coils
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Date added: 01/02/2008 |
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We report on optimized geometry for superconducting sensing coils used in SQUID Low-Field Magnetic Resonance
Imaging systems, SQUID magneto-encephalography
(MEG) devices, and similar sensing configurations where the signal from small magnetic dipoles is detected. The result is 50% improvement in the noise-equivalent sensitivity, and reducing the MRI acquisition time by
half, compared to conventional wire-wound configuration. |
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