An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
W W. Bannister, A Donatelli, F Bonner, F Lai, P Kurup, J Egan, E G. Jahngen, P Muanchareon, W Paramasawat, W Sriseubsai, S K. Chiang, V Kongkadee, S Sengupta, R Nagarajan, N Euaphantasate, V Parma, M Cazeca, E Chen, A Morales
Thomas E. Lipe Jr., Joseph R. Kinard Jr., Charles J. Burroughs, Paul Dresselhaus, Samuel Benz
We report the preliminary results of a project to improve the NIST calibration service for low-voltage thermal transfer standards. Central to this project is...
Mark W. Davis, Arthur H. Fanney, Michael J. LaBarre, K R. Henderson, Brian P. Dougherty
Researchers at the National Institute of Standards and Technology (NIST) have measured the performance of a residential fuel cell system when subjected to...
We report the efficient generation of correlated photon pairs by four-wave mixing in a 1.8 meter long microstructure fiber. The detected coincidence rate is 10...
Optical atomic clocks using cold atoms, stable lasers and femtosecond laser frequency combs provide high accurace and stability from RF to the ultraviolet. They...
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...
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...
Micropillars and deep circular gratings etched into planar aluminum oxide/GaAs microcavities display small mode volumes, enhanced spontaneous emission, and...
The effects of Raman, self-steepening and higher-order dispersion on a fiber-laser frequency comb are analyzed using perturbation theory. Transfer functions are...
Brian Washburn, R W. Fox, William C. Swann, Nathan R. Newbury, Jeffrey W. Nicholson, K Feder, Paul S. Westbrook
A frequency comb generated by a variable repetition rate mode-locked fiber laser is presented. The spacing of the frequency comb can be scanned while one comb...
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...
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...
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...
Arttu Luukanen, Aaron J. Miller, Erich N. Grossman
We present passive indoor imagery of human subjects in the 100 - 1000 GHz band. In order to obtain adequate ensitivity, a cryogenically cooled (4 K), broadband...
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...
Interest in dense sensor networks due to falling price and reduced size has motivated research in sensor location in recent years. While many algorithms can be...
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...
George P. Eppeldauer, Steven W. Brown, Keith R. Lykke, Yoshihiro Ohno
The recently introduced detector-based calibration method for tristimulus colorimeters has been realized. The NIST reference colorimeter has been calibrated for...
The color rendering index (CRI) does not adequately assess the color rendering properties of solid-state light sources. An improved metric will be critical to...
An improved method for the correction of bandpass errors in spectrometers has been developed. This method is an improvement over the Stearns and Stearns method...
Herbert S. Bennett, Julio Costa, Anthony A. Immorlica, Charles E. Weitzel
Selected opportunities and technical challenges for indium phosphide and related materials from the perspective of the International Technology Roadmap for...
Samuel L. Manzello, Thomas G. Cleary, John R. Shields, Jiann C. Yang
An experimental apparatus has been built to investigate the ignition of fuel beds as a result of impact with burning firebrands. The apparatus allowed for the...
Detector uniformity is measured using a specially designed system which provides a small beam of laser radiation (at nominal wavelengths of 850 nm, 1300 nm, or...
An alphabet soup of display standards addresses the various needs and applications of display manufactures, integrators, and users. Unfortunately, when it comes...