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Topic Area: Optical Metrology
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Displaying records 61 to 70 of 118 records.
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61. Time-domain spectroscopy of the optical free-induction decay from vibrating molecules
Topic: Optical Metrology
Published: 4/26/2010
Authors: Ian R Coddington, William C Swann, Nathan Reynolds Newbury
Abstract: Time-domain spectroscopy using dual, coherent frequency combs is used to measure free-induction decay from a molecular gas sample in the near-IR with a time-domain signal-to-noise ratio of ~10^u6^ over a ~6 ns window at 55 fs time resolution (corresp ...

62. Deformation-Free Form Error Measurements of Thin, Plane-Parallel Optics Floated on a Heavy Liquid
Topic: Optical Metrology
Published: 4/1/2010
Authors: JiYoung Chu, Ulf Griesmann, Quandou Wang, Johannes A Soons, Eric C Benck
Abstract: We describe a novel method for measuring the unconstrained flatness error of thin, plane parallel precision optics by floating them on high-density aqueous metatungstate solutions while measuring the flatness error with an interferometer. The supp ...

63. Internal quantum efficiency modeling of silicon photodiodes
Topic: Optical Metrology
Published: 4/1/2010
Authors: Thomas R Gentile, Steven W Brown, Keith R Lykke, Ping-Shine Shaw, John Taylor Woodward IV
Abstract: Results are presented for modeling of the internal quantum efficiency (IQE) of silicon photodiodes in the 400 nm to 900 nm wavelength range. The IQE data are based on measurements of the external quantum efficiencies of three transmission trap detec ...

64. Enhancing Image Contrast Using Coherent States and Photon Number Resolving Detectors
Topic: Optical Metrology
Published: 3/15/2010
Authors: Aaron Pearlman, Alexander E. Ling, Elizabeth Anne Goldschmidt, Jingyun Fan, Christoph Wildfeuer, Alan L Migdall
Abstract: We experimentally map the transverse profile of diffraction-limited beams using photon number resolving detectors. We observe strong compression of diffracted beam profiles for high detected photon number. This effect leads to higher contrast than ...

65. Iron Optical Constants and Reflectance Spectroscopy of Planetary Surfacers
Topic: Optical Metrology
Published: 3/1/2010
Authors: David Blewett, Nhan V Nguyen, Oleg A Kirillov, Samuel Lawrence

66. Low-Cost, High-Throughput, Automated Counting of Bacterial Colonies
Topic: Optical Metrology
Published: 1/5/2010
Authors: Matthew Lawrence Clarke, Robert L Burton, A. Nayo Hill, Maritoni Abatayo Litorja, Moon H. Nahm, Jeeseong Hwang
Abstract: Research involving bacterial pathogens often requires enumeration of bacteria colonies. Here we present a low-cost, high-throughput colony counting system consisting of colony counting software and a consumer-grade digital camera or document scanner ...

67. Scalable multiplexed detector system for high-rate telecom-bandsingle-photon detection
Topic: Optical Metrology
Published: 11/25/2009
Authors: Sergey V Polyakov, Alan L Migdall, Giorgio Brida, Ivo P Degiovanni, Fabrizio Piacentini, V Schettini
Abstract: We present a photon-counting detection system at telecom wavelengths that overcomes the difficulties of photon-counting at high rates. Our detection system uses active multiplexing, an array of N detectors, and a 1-by-N optical switch with a control ...

68. Photomask metrology using a 193 nm scatterfield microscope
Topic: Optical Metrology
Published: 9/30/2009
Authors: Richard Quintanilha, Bryan M Barnes, Martin Y Sohn, Lowell P. Howard, Richard M Silver, James Edward Potzick, Michael T. Stocker
Abstract: The current photomask linewidth Standard Reference Material (SRM) supplied by the National Institute of Standards and Technology (NIST), SRM 2059, is the fifth generation of such standards for mask metrology. The calibration of this mask has been ...

69. NIST s Integrated Colony Enumerator (NICE)
Topic: Optical Metrology
Published: 8/11/2009
Authors: Matthew Lawrence Clarke, Jeeseong Hwang
Abstract: Enumeration of bacterial colonies in an agar plate is simple in concept, but automated colony counting is difficult due to variations in colony color, size, shape, contrast, and density, as well as colony overlap. Furthermore, in applications where ...

70. The-Final-State Symmetry of Na 1s Core-shell Excitons in NaCl and NaF
Topic: Optical Metrology
Published: 7/8/2009
Authors: Eric L Shirley, K. P. Nagle, G T Seidler, T. T. Fister, J. A. Bradley, F. C. Brown
Abstract: We report measurements of the Na 1s contribution to the nonresonant inelastic x-ray scattering (NRIXS) from NaCl and NaF. Prior x-ray absorption studies have observed two pre-edge excitons in both materials. The momentum transfer-dependence (q-depe ...

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