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Topic Area: Optical Physics
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Displaying records 41 to 50 of 66 records.
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41. Precision spectroscopy with frequency combs at 3.4 {mu}m
Topic: Optical Physics
Published: 8/2/2011
Authors: Esther Baumann, Fabrizio Raphael Giorgetta, William C Swann, Alexander M. Zolot, Ian R Coddington, Nathan Reynolds Newbury
Abstract: We discuss precision spectroscopy with a comb-based spectrometer at 3.4 {mu}m. Our goal is to explore comb-based spectroscopy as an alternative method for fast, highly resolved, accurate measurements of gas line shapes. The spectrometer uses dual 1.5 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909488

42. Progress Toward Corrugated Feed Horn Arrays in Silicon
Topic: Optical Physics
Published: 12/16/2009
Authors: Joseph Wright Britton, Ki W. Yoon, James A Beall, Daniel T Becker, Hsiao-Mei Cho, Gene C Hilton, Michael D. Niemack, Kent D Irwin
Abstract: We are developing monolithic arrays of corrugated feed horns fabricated in silicon for dual-polarization single mode operation at 90, 145 and 220 GHz. The arrays consist of hundreds of platelet feed horns assembled from gold coated stacks of micromac ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903191

43. Quasi-phasematched Second Harmonic Generation in GaAs Microdisks
Topic: Optical Physics
Published: 11/15/2009
Authors: Paulina S Kuo, W Fang, Glenn Scott Solomon
Abstract: We discuss design and tuning of second-harmonic generation in GaAs microdisks. Quasi-phasematching can be achieved in the microdisk geometry without external domain inversions, but efficient nonlinear optical mixing requires that all waves be resonan ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903181

44. Quasianalytical modal approach for computing Casimir interactions in periodic nanostructures
Topic: Optical Physics
Published: 10/3/2012
Authors: Francesco Intravaia, Paul S Davids, Ricardo Decca, Vladimir A Aksyuk, Daniel Lopez, Diego A. R. Dalvit
Abstract: We present an almost fully analytical technique for computing Casimir interactions between 1D periodic lamellar gratings based on a modal approach. Our method improves on previous work on Casimir modal approaches for nanostructures by using the exa ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912110

45. Random testing reveals excessive power in commercial laser pointers
Topic: Optical Physics
Published: 5/1/2013
Authors: Joshua Aram Hadler, Edna L Tobares, Marla L Dowell
Abstract: In random testing of 122 commercial laser pointers, we observed that 89.7 % of green pointers and 44.4 % of red pointers were not in compliance with the Code of Federal Regulations, producing laser power in excess of the Accessible Emission Limit at ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912603

46. Rapid, high resolution frequency comb measurements
Topic: Optical Physics
Published: 2/13/2011
Authors: Ian R Coddington, Fabrizio Raphael Giorgetta, Esther Baumann, William C Swann, Nathan Reynolds Newbury
Abstract: Frequency combs serve as an extremely high accuracy reference across broad portions of the optical spectrum. Dual frequency combs harness this accuracy and allow for fast and highly flexible measurements of passive and active sources.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907399

47. Remote sensing of chiral signatures on Mars
Topic: Optical Physics
Published: 11/1/2012
Authors: William Sparks, James H. Hough, Thomas Avery Germer, Frank Robb, Ludmilla Kolokolova
Abstract: We describe circular polarization as a remote sensing diagnostic of chiral signatures which may be applied to Mars. The remarkable phenomenon of homochirality provides a unique biosignature which can be amenable to remote sensing through circular ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910692

48. Results of aperture area comparisons for exo-atmospheric total solar irradiance measurements
Topic: Optical Physics
Published: 11/13/2013
Authors: Bettye C Johnson, Maritoni Abatayo Litorja, Joel B. Fowler, Eric L Shirley, James J Butler, Robert A Barnes
Abstract: Exo-atmospheric solar irradiance measurements made by the solar irradiance community since 1978 incorporate limiting apertures with diameters measured by a number of metrology laboratories using a variety of techniques. Knowledge of the aperture are ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913537

49. Scatterfield Optical Imaging for sub-10 nm Dimensional Metrology
Topic: Optical Physics
Published: 1/1/2009
Author: Richard M Silver
Abstract: Recent developments in optical microscopy promise to advance optical metrology and imaging to unprecedented levels through theoretical and experimental development of a new measurement technique called "scatterfield optical imaging". ". Current met ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901009

50. Sensitivity Comparison of Mx and Frequency Modulated Bell-Bloom Cs Magnetometers in a Micro-Fabricated Cell
Topic: Optical Physics
Published: 2/1/2010
Authors: Ricardo Jimenez Martinez, William C. Griffith, Ying-ju Wang, Svenja A Knappe, John E Kitching, Ken Smith, Mark Prouty
Abstract: We compare the sensitivity performance of two optically pumped atomic magnetometers based on the Mx and frequency-modulated Bell-Bloom configurations. The Cs magnetometers are implemented using a millimeter-scale microfabricated vapor cell in a confi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842606



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