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You searched on: Topic Area: Optics Sorted by: date

Displaying records 51 to 60 of 61 records.
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51. Molecular spectroscopy with frequency combs
Topic: Optics
Published: 3/1/2010
Author: Ian R Coddington
Abstract: Pulsed femtosecond frequency combs are rapidly developing as a powerful spectroscopic tool. As a spectroscopic source stabilized frequency combs potentially offer broad spectral coverage, near perfect frequency accuracy, low timing jitter and broadb ...

52. Single-Photon Propagation Time through Dielectric Bandgaps: Large Variation Due to Small Structural Changes
Topic: Optics
Published: 2/1/2010
Authors: Natalia Borjemscaia Rutter, Sergey V Polyakov, Paul D Lett, Alan L Migdall
Abstract: The transit times of photons traveling through opaque barriers such as dielectric stacks exhibit the Hartman saturation effect. This saturation of the transit time is quite sensitive to the addition of a single dielectric layers, even onto an alread ...

53. Infrared time domain spectroscopy with synchronized frequency combs
Topic: Optics
Published: 1/29/2010
Authors: Nathan Reynolds Newbury, Ian R Coddington, William C Swann
Abstract: We describe a frequency-comb based system for time-domain spectroscopy in the near infrared. Our configuration implements synchronous, repetitive sampling of the time domain signature for real-time coherent signal averaging and improved signal-to-noi ...

54. Polarized Optical Scattering Signatures from Biological Materials
Topic: Optics
Published: 1/11/2010
Authors: W. E. Martin, E. Hesse, J. H. Hough, William Sparks, C. S. Cockell, Z. Ulanowski, Thomas Avery Germer, B. Kaye
Abstract: The polarization of laser light backscattered from biological samples has been measured over the wavelength range 350 to 850nm. Incident circular, linearly polarized, and unpolarized light produces significant spectrally prominent scattered polari ...

55. Progress Toward Corrugated Feed Horn Arrays in Silicon
Topic: Optics
Published: 12/16/2009
Authors: Joseph Wright Britton, Ki W. Yoon, James A Beall, Daniel Thomas 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 ...

56. Effect of Surface Modes on Photon Propagation through Dielectric Bandgaps
Topic: Optics
Published: 10/28/2009
Authors: Natalia Malkova, Sergey V Polyakov, Alan L Migdall, Garnett W Bryant
Abstract: We investigate the Hartman saturation effect of photons traveling through barriers created by bandgaps of multilayer stacks. In particular, we investigate theoretically the recently observed jumps in photon transversal times due to adding a single l ...

57. Coalescing GSICS Correction Coefficients
Topic: Optics
Published: 8/14/2009
Author: Ruediger Kessel
Abstract: We would like to present a technique to adjust the uncertainty estimates of each point in a time series, so that the variance of the time series is consistent with the uncertainty estimates of its component points. This would allow the uncertainty of ...

58. High Accuracy Dual Lens Transmittance Measurements
Topic: Optics
Published: 8/1/2007
Authors: J Cheung, James Gardner, Alan L Migdall, Sergey V Polyakov, Michael Ware
Abstract: We show how to determine the transmittance of short focal length lenses (f ~ 19 mm, in this case) with an uncertainty of 1 part in 103 or better by measuring transmittances of lens pairs of a set of three or more lenses with the same nominal focal le ...

59. Alignment of Fiducial Marks in a Tomographic Tilt Series with an Unknown Rotation Axis
Topic: Optics
Published: 4/1/2007
Authors: Zachary H Levine, Peter Volkovitsky, Howard Hung
Abstract: Alignment for tomography using a transmission electron microscopy frequently uses colloidal gold particles as fiducial reference marks. Typically, there is an implicit assumption that the tilt axis of the tomographic series is orthogonal to the beam ...

60. Tests of a Two-Photon Technique for Measuring Polarization Mode Dispersion With Subfemtosecond Precision
Topic: Optics
Published: 1/1/1999
Authors: Eric Dauler, Gregg Jaeger, A Muller, Alan L Migdall
Abstract: An investigation is made of a recently introduced quantum interferometric method capable of measuring polarization mode dispersion (PMD) on sub-femtosecond scales, without the usual interferometric stability problems associated with such small ...

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