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Topic Area: Optical Physics

Displaying records 51 to 60 of 62 records.
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51. Integral Equations for 3-D Scattering: Finite Strip on a Substrate
Topic: Optical Physics
Published: 11/28/2008
Author: Egon Marx
Abstract: Singular integral equations that determine the exact fields scattered by a dielectric or conducting finite strip on a substrate are presented. The computation of the image of such a scatterer from these fields by Fourier optics methods is also shown ...

52. Yb Optical Lattice Clock
Topic: Optical Physics
Published: 11/23/2008
Authors: Nathan D. Lemke, Andrew D Ludlow, Zeb Barber, N Poli, C.W. Hoyt, Long-Sheng Ma, Jason Stalnaker, Christopher W Oates, Leo Hollberg, James C Bergquist, A. Brusch, Tara Michele Fortier, Scott A Diddams, Thomas Patrick Heavner, Steven R Jefferts, Thomas Edward Parker
Abstract: We describe the development and latest results of an optical lattice clock based on neutral Yb atoms, including investigations based on both even and odd isotopes. We report a fractional frequency uncertainty below 10^u-15^ for ^u171^Yb.

53. Calibration of a Radiance Standard for the NPP/OMPS Instrument
Topic: Optical Physics
Published: 10/9/2008
Authors: Bettye C Johnson, James J. Butler, Scott J. Janz, Robert D. Saunders, John W. Cooper, Matthew G. Kowalewski, R Barnes
Abstract: In June 2007, a spherical integrating source was calibrated in the National Aeronautics and Space Administration(NASA) Goddard Space Flight Center‰s (GSFC) Calibration Facility as part of the prelaunch characterization program for the NPOESS Pre ...

54. Off-line monitoring of OSNR/CD/PMD degradation effects using neural-network-based training sequences
Topic: Optical Physics
Published: 9/1/2008
Authors: Jeffrey A Jargon, Xiaoxia Wu, Alan Willner
Abstract: A technique using artificial neural networks to simultaneously identify OSNR, CD, and PMD from eye-diagram parameters is demonstrated both via simulation and experimentally in 40 Gb/s OOK and DPSK systems. A correlation coefficient of 0.99 is obtaine ...

55. Long distance optical frequency transfer over fiber: predicting the frequency stability from the fiber noise
Topic: Optical Physics
Published: 5/19/2008
Authors: Nathan Reynolds Newbury, Paul A Williams, William C Swann
Abstract: We have recently demonstrated the coherent transfer of an optical signal over a 251 km link of optical fiber using the standard Doppler-cancellation approach to remove the effects of the fiber-link noise. The fundamental limit to the frequency instab ...

56. Improving squeezing purity from a KNbO^u3^ crystal by temperature tuning
Topic: Optical Physics
Published: 5/4/2008
Authors: Thomas Gerrits, Tracy S. Clement, Scott Glancy, Richard P Mirin, Sae Woo Nam, Emanuel Knill
Abstract: We show a method to increase the purity of a squeezed state generated by a femtosecond laser and down-conversion crystal. The method relies on temperature tuning the down- and up-converting crystals, which changes the spatial and spectral output mode ...

57. Uniform and enhanced field emission from chromium oxide coated carbon nanosheets
Topic: Optical Physics
Published: 4/2/2008
Authors: Uwe Arp, Kun Hou, Ronald Outlaw, Wang Sigen, Mingyao Zhu, Ronald Quinlan, Dennis Manos, Martin Kordesch, Brian Holloway
Abstract: Carbon nanosheets, a two-dimensional carbon nanostructure, are promising electron cathode materials for applications in vacuum microelectronic devices. This letter demonstrates a simple approach to improve the spatial emission uniformity of carbon na ...

58. Fiber lasers for frequency standards in optical communications
Topic: Optical Physics
Published: 2/24/2008
Authors: Nathan Reynolds Newbury, William C Swann, Ian R Coddington, Paul A Williams
Abstract: Optical light with millihertz relative frequency stabilities and subfemtosecond timing jitter can be produced from stabilized cw or mode-locked fiber lasers. We will discuss the generation, fiber-optic distribution and some applications of these cohe ...

59. Confirmation of Interstellar Methycyanodiacetylene (CH3C5N)
Topic: Optical Physics
Published: 4/11/2006
Authors: Lewis E Snyder, J M Hollis, P R Jewell, Francis John Lovas, A J Remijan
Abstract: Ten spectral lines of the symmetric-top molecule methylcyanodiacetylene (CH3C5N) have been detected with the 100 m Green Bank Telescope (GBT) toward the Taurus molecular cloud TMC-1. Both K=0 and K=1 components of the 12K-11K, 13K-12K, 14K-13K, 15K- ...

60. Wavelength References for Optical Interferometry
Topic: Optical Physics
Published: 6/12/2005
Authors: Richard W Fox, Leo W. Hollberg
Abstract: We are exploring air wavelength references useful for interferometry. Femtosecond comb frequency measurements determine mode wavelengths of a stable optical cavity in vacuum, and subsequently a tunable laser is locked to the modes in air.

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