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Displaying 801 - 825 of 1598

Step beyond Kohler illumination analysis for far-field imaging: Angular illumination asymmetry (ANILAS) maps

September 21, 2016

Author(s)

Ravikiran Attota

Abundance estimation of solid and liquid mixtures in hyperspectral imagery with albedo-based and kernel-based approaches

September 19, 2016

Author(s)

David W. Allen, Ronald G. Resmini, Robert S. Rand

This study investigates methods for characterizing materials that are mixtures of granular solids, or mixtures of liquids, which may be linear or non-linear. Linear mixtures of materials in a scene are often the result of areal mixing, where the pixel size

PRELIMINARY RESULTS OF BTDF CALIBRATION OF TRANSMISSIVE SOLAR DIFFUSERS FOR REMOTE SENSING

September 19, 2016

Author(s)

Catherine C. Cooksey, Georgi T. Georgiev, Leibo Ding, James J. Butler

Satellite instruments operating in the solar wavelength region require accurate and precise determination of the optical properties of their diffusers used in pre-flight and post-flight calibrations. The majority of recent and current space instruments use

Interaction of aerosol particle with a standing wave optical field

September 16, 2016

Author(s)

John J. Curry

Trajectories of spherical dielectric particles carried across an optical standing wave by a flowing medium areinvestigated. Trajectories are determined by a three-dimensional Monte Carlo calculation that includes drag forces, Brownian motion, and optical

Surface plasmon resonance microscopy: achieving a quantitative optical response

September 7, 2016

Author(s)

Alexander Peterson, Michael Halter, Anne Plant, John Elliott

Surface plasmon resonance imaging (SPRI) allows real-time label-free imaging based on index of refraction, and changes in index of refraction at an interface. SPRI can be carried out on a microscope by launching light into a sample, and collecting

Optical Sorting of Dielectric Spheres in a Standing Wave Calculated with Effective Velocities and Diffusion Constants

September 7, 2016

Author(s)

Zachary H. Levine, John J. Curry

Recently, as part of a study of the ability of a Gaussian standing-wave interference field to sort small dielectric particles entrained in a moving fluid, we implemented a two-length-scale method to determine the trajectories of the particles. In the first

OptSortSph: Optical Sorting in a Standing Wave Field Calculated with Effective Velocities and Diffusion Constants

September 7, 2016

Author(s)

Zachary H. Levine, John J. Curry

Recently, as part of a study of the ability of a Gaussian standing-wave interference field to sort small dielectric spheres entrained in a moving fluid, we implemented a two-length-scale method to determine the trajectories of the particles. In the first

A Thickness-Unknown Method for the Low-Loss Dielectric Characterization from Free-Space Scattering Measurements

September 1, 2016

Author(s)

Sung Kim, David R. Novotny, Joshua A. Gordon, Jeffrey R. Guerrieri

A free-space measurement method is presented for the characterization of low-loss dielectric materials at millimeter-wave (MMW) frequencies that does not require any assumption of a priori knowledge of the sample thickness. The present method first employs

Bidirectional scattering distribution function measurements from volume diffusers: Correction factors and associated uncertainties

September 1, 2016

Author(s)

Thomas A. Germer

We consider the effect of volume diffusion on measurements of the bidirectional scattering distribution function (BSDF) when a finite distance is used for the solid angle defining aperture. We derive expressions for correction factors that can be used when

Ultra-low-noise monolithic mode-locked solid-state laser

September 1, 2016

Author(s)

T D. Shoji, W Xie, Kevin L. Silverman, Ari Feldman, Todd E. Harvey, Richard Mirin, Thomas Schibli

Low-noise, high-repetition-rate mode-locked solid-state lasers are attractive for precision measurement and microwave generation, but the best lasers in terms of noise performance still consist of complex, bulky optical setups, which limits their range of

Ambient-condition growth of high-pressure phase centrosymmetric crystalline KDP microstructures for optical second harmonic generation

August 26, 2016

Author(s)

Lu Deng, Edward W. Hagley, Yan Ren

Noncentrosymmetric potassium dihydrogen phosphate (KH2PO4 or KDP) in the tetragonal crystal phase is arguably the most extensively studied nonlinear optical crystal in history. It has prolific applications ranging from simple laser pointers to laser

Ontology-based laser and thermal metamodels for metal-based additive manufacturing

August 24, 2016

Author(s)

Paul Witherell, Ibrahim Assouroko, Roh Byeong-Min, Timothy Simpson, Soundar Kumara

Additive manufacturing (AM) is creating renewed interest in manufacturing thanks to the freedom it provides to design and innovate. One of the biggest challenges in AM is inadequate repeatability in product quality and reliability of the process for

Broadband Coherent Anti-Stokes Raman Scattering

August 11, 2016

Author(s)

Charles H. Camp

Broadband coherent anti-Stokes Raman scattering (BCARS) microspectroscopy is a unique label-free imaging modality that provides detailed chemical information at each pixel. In minutes, this technique captures a hyperspectral cube that co-registers

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