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Topic Area: Physics

Displaying records 31 to 40 of 733 records.
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31. Optical phase-noise dynamics of Titanium:sapphire optical frequency combs
Topic: Physics
Published: 1/24/2014
Authors: Qudsia Quraishi, Scott A Diddams, Leo W. Hollberg
Abstract: Stabilized optical frequency combs (OFC) can have remarkable levels of coherence across their broad spectral bandwidth. We study the scaling of the optical noise across hundreds of nanometers of optical spectra. We measure the residual phase noise be ...

32. Fast and Reliable Spectral Response Measurements of PV Cells Using Light Emitting Diodes
Topic: Physics
Published: 1/1/2014
Authors: Behrang H Hamadani, John F Roller, Brian P Dougherty, Howard W Yoon
Abstract: We present a measurement system for absolute differential spectral responsivity of solar cells based on high-powered LED arrays coupled to an optical light guide capable of large area illumination. Two different measurement techniques were developed ...

33. Dissipative production of a maximally entangled steady state of two quantum bits
Topic: Physics
Published: 12/19/2013
Authors: John P Gaebler, Yiheng Lin, Florentin Reiter, Ting Rei Tan, Ryan Steven Bowler, Anders Sorensen, Dietrich G Leibfried, David J Wineland
Abstract: Entangled states are a key resource in fundamental quantum physics, quantum cryptography, and quantum computation [1]. To date, controlled unitary interactions applied to a quantum system, so-called "quantum gates'', have been the most widely used me ...

34. Absolute and relative stability of an optical frequency reference based on spectral hole burning in Eu^u3+^:Y^d2^SiO^d5^
Topic: Physics
Published: 12/6/2013
Authors: David R Leibrandt, M Thorpe, Chin W. Chou, Tara Michele Fortier, Scott A Diddams, Till P Rosenband
Abstract: We present four frequency comparison measurements designed to investigate the performance of an optical frequency reference based on spectral hole burning in Eu$^u3+^:Y^d2^SiO^d5^. The first frequency comparison, between a single unperturbed spectral ...

35. A New Algorithm to Eliminate GPS Carrier-Phase Time Transfer Boundary Discontinuity
Topic: Physics
Published: 12/5/2013
Authors: Jian Yao, Judah Levine
Abstract: We report on a study of the Global Positioning System (GPS) carrier-phase (CP) time transfer boundary discontinuity by the use of precise point positioning (PPP) technique. We first demonstrate that the pseudorange measurement noise leads to the boun ...

36. Phase inversion and collapse of the cross-spectral function
Topic: Physics
Published: 12/5/2013
Authors: Craig W Nelson, Archita Hati, David Allan Howe
Abstract: Cross-spectral analysis is a mathematical tool for extracting the power spectral density of a correlated signal from two time series in the presence of uncorrelated interfering signals. We demonstrate and explain a set of conditions where the detect ...

37. Three-Corner Hat Analysis of the Stability of UTC and Various UTC(k)s
Topic: Physics
Published: 12/5/2013
Author: Thomas Edward Parker
Abstract: The stabilities of some local UTC time scales have recently improved dramatically with the increasing use of cesium or rubidium fountains as nearly always present frequency references. Along with time scales using maser ensembles, there are now a nu ...

38. Optical Atomic Clocks
Topic: Physics
Published: 12/1/2013
Authors: Christopher W Oates, N Poli, P. Gill, G.M. Tino
Abstract: In the last ten years extraordinary results in time and frequency metrology have been demonstrated. Frequency stabilization techniques for continous wave lasers and femto-second optical frequency combs have enabled a rapid development of frequency st ...

39. A View on Energy Transfer Between Cold Atoms
Topic: Physics
Published: 11/22/2013
Author: Elizabeth A Donley
Abstract: This is an invited perspective article on a paper that will appear in the same issue. The perspective describes imaging energy transfer between cold Rydberg atoms.

40. Polarization Enhanced Absorption Spectroscopy for Laser Stabilization"
Topic: Physics
Published: 11/15/2013
Authors: Paul David Kunz, Thomas Patrick Heavner, Steven R Jefferts
Abstract: We demonstrate a variation of pump-probe spectroscopy that is particularly useful for laser frequency stabilization. This polarization enhanced absorption spectroscopy (POLEAS) signal provides a significant improvement in signal-to-noise ratio over s ...

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