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Displaying 36026 - 36050 of 74178

Frequency Comb Dynamics of a Solitonic Fiber Laser: Theory

May 22, 2005
Author(s)
Nathan R. Newbury, Brian Washburn
The effects of Raman, self-steepening and higher-order dispersion on a fiber-laser frequency comb are analyzed using perturbation theory. Transfer functions are derived for the comb response to change in cavity length or pump power.

Optical Atomic Clocks: A Revolution in Perfomance

May 22, 2005
Author(s)
Leo W. Hollberg
Optical atomic clocks using cold atoms, stable lasers and femtosecond laser frequency combs provide high accurace and stability from RF to the ultraviolet. They have unprecedented performance: ultrahigh stability, sub-fs timing jitter, lowe-noise

The Performance of Chip-Scale Atomic Clocks

May 22, 2005
Author(s)
Svenja A. Knappe, P Schwindt, Leo W. Hollberg, John E. Kitching, V Shah, Vladislav Gerginov
We compare the performance of two chip-scale atomic clock physics packages, one based on excitation using the D 2 line if Cs and the other using the D 1 line of 87Rb.

Ultra-high Stability Optical Frequency Standard Based on Laser-Cooled Neutral Calcium

May 22, 2005
Author(s)
G Wilpers, Christopher W. Oates, Scott A. Diddams, A Bartels, Windell Oskay, James C. Bergquist, Leo W. Hollberg
A beatnote between the Ca and Hg+ optical frequency standards via a mode-locked fs-laser frequency comb demonstrates the highest frequency stability measured to date. The high stability accelerates evaluation of the Ca standard's systematic shifts.

Laser Cooling of Erbium Atoms

May 21, 2005
Author(s)
Jabez J. McClelland, H Y. Ban, Marcus Jacka, James L. Hanssen, Joseph Reader
We have identified five closed, or nearly-closed, J ? J + 1 transitions in atomic erbium at wavelengths of 401 nm, 583 nm, 631 nm, 841 nm, and 1299 nm. These transitions can be reached by common tunable single-frequency laser systems, and are thus in

Direct Measurement of the Counterion Distribution Within Swollen Polyelectrolyte Films

May 20, 2005
Author(s)
Vivek M. Prabhu, B D. Vogt, Wen-Li Wu, Jack F. Douglas, Eric K. Lin, Sushil K. Satija, D M. Goldfarb, H Ito
A depth profile of the counterion concentration within thin polyelectrolyte films was measured in-situ using contrast variant specular neutron reflectivity to characterize the initial swelling stage of the film dissolution. We find a substantial counterion

HiCASS Target Tracking Sensor Study

May 20, 2005
Author(s)
Richard J. Norcross
The High Capacity Alongside Sea base Sustainment (HiCASS) program intends to generate substantial improvements in skin-to-skin at-sea replenishment. HiCASS requires real-time tracking and dynamic load position sensing.

Holographic microantenna array metrology

May 19, 2005
Author(s)
Erich N. Grossman, Arttu Luukanen, Aaron J. Miller
We describe a holographic or "phaseless" technique for measurement of complex antenna patterns that is particularly suited to planar antennas at very high frequencies -mm-wave thru long-wave infrared -where phase coherent detection is impractical. It has

Software Interoperability: Enabling New Technologies

May 19, 2005
Author(s)
John V. Messina, Matthew L. Aronoff, Eric D. Simmon
New and potentially disruptive technologies are constantly being introduced into the electronic interconnection industry as companies seek to improve their manufacturing chain and stay competitive. These new technologies do not exist in a vacuum and must

ThermoData Engine (TDE): Software Implementation of the Dynamic Data Evaluation Concept

May 18, 2005
Author(s)
Michael D. Frenkel, Robert D. Chirico, Vladimir Diky, Xinjian Yan, Qian Dong, Chris D. Muzny
The first full-scale software implementation of the dynamic data evaluation concept {ThermoData Engine (TDE)} is described for thermophysical and thermochemical property data. This concept requires the development of large electronic databases capable of

Low-frequency noise measurements on commercial magnetoresistive magnetic field sensors

May 17, 2005
Author(s)
Nathan Stutzke, Stephen E. Russek, David P. Pappas, Mark Tondra
Low frequency noise was measured in the frequency range from 0.1 Hz to 10 kHz on a variety of commercially available magnetic sensors. The types of sensors investigated include anisotropic magnetoresistance (AMR), giant magnetoresistance (GMR), and tunnel

Advantages of superconducting quantum interference device-detected magnetic resonance over conventional high-frequency electron paramagnetic resonance for characterization of nanomagnetic materials

May 16, 2005
Author(s)
Brant Cage, Stephen E. Russek, David Zipse, Naresh S. Dalal
A dc-detected high-frequency electron paramagnetic resonance (HF-EPR) technique, based on a standard superconducting quantum interference device (SQUID) magnetometer, has significant advantages over traditional HF-EPR based on microwave absorption

Machining Cracks in Finished Ceramics

May 16, 2005
Author(s)
George D. Quinn, L K. Ives, S Jahanmir
Well prepared strength test specimens and components break from a material s inherent flaws and machining damage has no effect on strength. On the other hand, grinding can create machining flaws that control strength and limit the performance of finished

Third Japan-US Workshop on Combinatorial Material Science and Technology

May 16, 2005
Author(s)
Winnie K. Wong-Ng
The Third Japan-US workshop on Combinatorial Material Science and Technology took place at the Loisir Hotel in Naha City on the historical island, Okinawa, Japan, from December 7 to December 10, 2004. This workshop was the third of a series of Japan-US

Current-induced switching in a single exchange-biased ferromagnetic layer

May 15, 2005
Author(s)
Tingyong Chen, Yi Ji, C Chien, Mark D. Stiles
We demonstrate current-induced switching effects in a single exchanged-biased ferromagnetic layer. A nanodomain can be switched within the ferromagnetic layer by a spin polarized current injected through a point contact. The high resistance of the

Magnetic normal modes of nano-elements

May 15, 2005
Author(s)
Robert McMichael, Mark D. Stiles
Micromagnetic calculations are used to determine the eigenfrequencies and precession patterns of some of the lowest-frequency magnetic normal modes of submicron patterned elements. For a Permalloy-like ellipse, 350 nm ¿ 160 nm ¿ 5 nm thick in zero field
Displaying 36026 - 36050 of 74178