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Topic Area: Optical Metrology

Displaying records 71 to 80 of 134 records.
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71. Dual frequency combs at 3.4 µm with subhertz residual linewidths
Topic: Optical Metrology
Published: 5/1/2010
Authors: Esther Baumann, Fabrizio Raphael Giorgetta, Ian R Coddington, William C Swann, Nathan Reynolds Newbury
Abstract: Two coherent 1.5-µm frequency combs are transferred to 3.4 µm by difference frequency generation with a 1064 nm cw laser. From a multi-heterodyne measurement, the residual linewidth between the comb teeth is resolution-limited at 200 mHz.

72. 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 ...

73. 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 ...

74. 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 ...

75. 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 ...

76. 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

77. 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 ...

78. Temperature Fundamentals
Topic: Optical Metrology
Published: 12/29/2009
Authors: Benjamin K Tsai, Graham Machin
Abstract: In this chapter the basic principles of temperature, its definition and measurement are given. Beginning with a brief outline of the fundamental principles, the reader is introduced to the concept of thermodynamic temperature and some of the primary ...

79. 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 ...

80. Spectral irradiance responsivity calibration of InSb radiometers using the improved IR-SIRCUS at NIST
Topic: Optical Metrology
Published: 10/15/2009
Authors: Jinan Zeng, Howard W Yoon, George P Eppeldauer, Leonard M Hanssen, Joseph Paul Rice
Abstract: The spectral irradiance responsivity calibrations of InSb radiometers measured on the tunable-laser based Infrared Spectral Irradiance and Radiance Responsivity Calibration with Uniform Sources (IR-SIRCUS) facility are discussed. This work describes ...

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