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Search Publications by: Tasshi Dennis (Fed)

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Displaying 26 - 41 of 41

Spectroscopic phase-dispersion optical coherence tomography measurements of scattering phantoms

September 4, 2006
Author(s)
Shellee D. Dyer, Tasshi Dennis, Lara Roberson, Shelley M. Etzel, Thomas Germer, Andrew Dienstfrey
We demonstrate a novel technique to determine the size of Mie scatterers with high sensitivity. Our technique is based on spectral domain optical coherence tomography measurements of the phase dispersion that is induced by the scattering process. We use

High Sensitivity Measurements of the Scattering Dispersion of Phantoms using Spectral Domain Optical Coherence Tomography

January 26, 2006
Author(s)
Shellee D. Dyer, Tasshi Dennis, Paul A. Williams, Lara Roberson, Shelley M. Etzel, Robert J. Espejo, Thomas Germer, T E. Milner
We demonstrate a novel technique to determine the size of Mie scatterers with high sensitivity. Our technique is based on spectral domain optical coherence tomography measurements of the dispersion that is induced by the scattering process. We use both Mie

Absolute frequency measurements with a stabilized near-infrared optical frequency comb from a Cr:forsterite laser

May 16, 2004
Author(s)
Kristan L. Corwin, I Thomann, Tasshi Dennis, R W. Fox, William C. Swann, E. A. Curtis, C. W. Oates, G Wilpers, A Bartels, Sarah L. Gilbert, Leo W. Hollberg, Scott Diddams, Nathan R. Newbury, Jeffrey W. Nicholson, M. Yan
A Cr:forsterite laser-based frequency comb is stabilized simultaneously to two NIST frequency references. Methane lines from 1315 nm - 1330 nm are measured with ±2.3 MHz uncertainty. The pressure shifts are also evaluated.

Absolute frequency measurements with a stabilized near-infrared optical frequency comb from a Cr:forsterite laser

February 15, 2004
Author(s)
Kristan L. Corwin, I Thomann, A Bartels, Tasshi Dennis, W. Fox, William C. Swann, E. A. Curtis, C. W. Oates, G Wilpers, Sarah L. Gilbert, Leo W. Hollberg, Nathan R. Newbury, Scott A. Diddams, Jeffrey W. Nicholson, M. Yan
A frequency comb is generated with a chromium-doped forsterite femtosecond laser, spectrally broadened in dispersion-shifted highly nonlinear fiber, and stabilized. The resultant evenly spaced comb of frequencies ranges from 1.1 to beyond 1.8 υm. The

Wavelength references for 1300-nm wavelength division multiplexing

May 1, 2002
Author(s)
Tasshi Dennis, E. A. Curtis, C. W. Oates, Leo W. Hollberg, Sarah L. Gilbert
We have conducted a study of potential wavelength calibration references for use as both moderate-accuracy transfer standards and high-accuracy National Institute of Standards and Technology (NIST) internal references in the 1280-1320 nm wavelength

Interferometric measurement of refractive-index change in photosensitive glass

April 1, 2001
Author(s)
Tasshi Dennis, E. M. Gill, Sarah L. Gilbert
We report on a technique for determining the change in the refractive index of photosensitive glass. We have demonstrated our interferometer-based technique on fiber preform and bulk glass samples, achieving an optical: path-difference (OPD) repeatability

Wavelength References for 1300 nm and L-Band WDM

March 1, 2001
Author(s)
Tasshi Dennis, William C. Swann, Sarah L. Gilbert
We have surveyed potential references for 1300 nm and L-band wavelength calibration. We have developed a 1314 nm methane reference for our internal calibration and are developing a carbon-monoxide transfer standard for the 1560-1630 nm region.

Wavelength References for Wavelength Division Multiplexing

January 1, 2001
Author(s)
Sarah L. Gilbert, Tasshi Dennis, William C. Swann
We describe NIST research on wavelength standards for optical fiber communications. We have developed transfer standrds that can be used to calibrate instruments in the 1510-1560 nm region and a investigating references for other regions.

Wavelength standards for optical communications

January 1, 2001
Author(s)
Sarah L. Gilbert, William C. Swann, Tasshi Dennis
We review wavelength accuracy and calibration issues for wavelength division multiplexed (WDM) optical fiber communication and describe our work on wavelength calibration references. We have developed wavelength references for National Institute of