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Physics

Optical physics and communications

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Displaying 801 - 825 of 861

Improving squeezing purity from a KNbO 3 crystal by temperature tuning

May 4, 2008
Author(s)
Thomas Gerrits, Tracy S. Clement, Scott Glancy, Richard P. Mirin, Sae Woo Nam, Emanuel Knill
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 of

Practical performance limits on optical frequency transfer over fiber optic links

May 4, 2008
Author(s)
Paul A. Williams, William C. Swann, Nathan R. Newbury
We present theory and experiment quantifying the limitations to stable transport of optical frequencies over optical fiber. These are fundamental fiber noise, propagation delay, bidirectional propagation and system noise in the measurement interferometers.

Fast-responding nonlinear phase shifter using a signal-wave gain medium

April 22, 2008
Author(s)
Lu Deng, Edward W. Hagley, Kaijun Jiang, Marvin G. Payne
Using a full density matrix formalism we show that for a lifetime broadened four-level scheme with a signal wave gain medium a large nonlinear phase shift can be induced without signal wave slowdown and attenuation. In this system the signal wave acquires

Direct Experimental Observation of the Goos Hanchen Shift

April 9, 2008
Author(s)
H G. Schwefel, W Kohler, Z Lu, Jingyun Fan, L Wang
We report a precise direct measurement of the Goos-Hanchen (GH) shift after one reflection off a dielectric interface coated with periodic metal stripes. The spacial displacement of the shift is determined by image analysis. A maximal absolute shift of 5

Uniform and enhanced field emission from chromium oxide coated carbon nanosheets

April 2, 2008
Author(s)
Uwe Arp, Kun Hou, Ronald Outlaw, Wang Sigen, Mingyao Zhu, Ronald Quinlan, Dennis Manos, Martin Kordesch, Brian Holloway
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

Fiber lasers for frequency standards in optical communications

February 24, 2008
Author(s)
Nathan R. Newbury, William C. Swann, Ian R. Coddington, Paul A. Williams
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 coherent

NIST Special Publication 250-79 Airspeed Calibration Service.

September 26, 2007
Author(s)
Tsyh Tyan Yeh, J. M. Hall
The National Institute of Standards and Technology (NIST) provides calibration services for airspeed instrumentation such as Pitot-static tubes, anemometers (ultrasonic, thermal or hot-wire, cup, and propeller types) as well as others. The NIST calibration

High Accuracy Dual Lens Transmittance Measurements

August 1, 2007
Author(s)
J Cheung, James Gardner, Alan L. Migdall, Sergey Polyakov, Michael Ware
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 length

Slab-coupled optical waveguide devices for low-noise signal generation

July 23, 2007
Author(s)
Paul W. Juodawlkis, Frederick J. O'Donnell, Jason J. Plant, John B. Schlager
We review the use of slab-coupled optical waveguide amplifiers (SCOWAs) in low-noise mode-locked and single-frequency lasers. We also report a new single-frequency laser cavity incorporating an Er/Yb-codoped waveguide distributed Bragg-reflector that

Nonthermal continuum toward Sagittarius B2(N-LMH)

April 11, 2007
Author(s)
J M. Hollis, P R. Jewell, A Remijan, Francis J. Lovas
An analysis of continuum antenna temperatures observed in theGBTspectrometer bandpasses is presented for observations toward Sgr B2(N-LMH). Since 2004, we have identified four new prebiotic molecules toward this source by means of rotational transitions

Synchrotron Radiation Based Irradiance Calibration From 200 nm to 400 nm at SURF III

January 1, 2007
Author(s)
Uwe Arp, Charles E. Gibson, Keith R. Lykke, Albert C. Parr, Robert D. Saunders, D J. Shin, Ping-Shine Shaw, Zhigang Li, Howard W. Yoon
A new facility for measuring source irradiance was commissioned recently at the National Institute of Standards and Technology (NIST). The facility uses the calculable radiation from the Synchrotron Ultraviolet Radiation Facility (SURF III) as the primary

Review of ultraviolet and high power laser measurement standards at NIST

October 25, 2006
Author(s)
John H. Lehman, Christopher L. Cromer, Shao Yang, Marla L. Dowell
High accuracy laser radiometry is on the verge of growth and improvements just as new laser technologies are evolving. Our present tasks are directed toward anticipating and meeting the measurement needs in two areas; higher power and shorter wavelengths

Confirmation of Interstellar Methycyanodiacetylene (CH3C5N)

April 11, 2006
Author(s)
Lewis E. Snyder, J M. Hollis, P R. Jewell, Francis J. Lovas, A J. Remijan
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-14K

Nonlinearity of high-power optical fiber power meters at 1480 nm

February 20, 2006
Author(s)
Igor Vayshenker, Shao Yang, Ralph Swafford
We describe a calibration system that measures the nonlinearity of optical fiber power meters (OFPMs) at a maximum power of 0.6 W and a minimum power of 0.2 mW at 1480 nm. The system is based on the triplet superposition method. This system measures the

Wavelength References for Optical Interferometry

June 12, 2005
Author(s)
Richard W. Fox, Leo W. Hollberg
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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