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Topic Area: Optical Physics

Displaying records 21 to 30 of 62 records.
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21. Demonstration of Superluminal Images
Topic: Optical Physics
Published: 6/19/2012
Authors: Ryan Thomas Glasser, Ulrich Vogl, Paul D Lett
Abstract: Optical pulse propagation with group velocities larger than the speed of light in vacuum, c, or negative, have been demonstrated theoretically and experimentally in a variety of systems [1‹5]. The anomalous dispersion required for generating ,fastŠ l ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910700

22. Stimulated Generation of Superluminal Light Pulses via Four-wave Mixing
Topic: Optical Physics
Published: 4/26/2012
Authors: Ryan Thomas Glasser, Ulrich Vogl, Paul D Lett
Abstract: We report on the four-wave mixing of superluminal pulses, in which both the injected and generated pulses involved in the process propagate with negative group velocities. Generated pulses with negative group velocities of up to vg = −c/880 ar ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910231

23. Ultrafast Demagnetization Measurements using Extreme Ultraviolet Light: Comparison of Electronic and Magnetic Contributions
Topic: Optical Physics
Published: 1/23/2012
Authors: Thomas J Silva, Justin M Shaw, Hans Toya Nembach, Margaret M. Murnane, Henry C. Kapteyn, Chan La-O-Vorakiat, Stefan Mathias, Emrah Turgut, Teale A. Carson, Martin Aeschlimann, Claus M. Schneider
Abstract: Ultrashort pulses of extreme ultraviolet light from high-harmonic generation are a new tool for probing coupled charge, spin, and phonon dynamics with element specificity, attosecond pump-probe synchronization, and time resolution of a few-femtosecon ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910037

24. High-resolution single-mode fiber-optic distributed Raman sensor for absolute temperature measurement using superconducting nanowire single-photon detectors
Topic: Optical Physics
Published: 11/17/2011
Authors: Michael G. Tanner, Shellee Dawn Dyer, Burm Baek, Robert Hadfield, Sae Woo Nam
Abstract: We demonstrate a distributed fiber Raman sensor for absolute temperature measurement with spatial resolution on the order of 1 cm at 1550 nm wavelength in single mode fiber using superconducting nanowire single photon detectors. Rapid measurements ar ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908723

25. A coherent dual-comb spectrometer at 3.4 {mu}m for accurate line center measurement of methane
Topic: Optical Physics
Published: 10/10/2011
Authors: Esther Baumann, Fabrizio Raphael Giorgetta, Ian R Coddington, William C Swann, Alexander M. Zolot, Nathan Reynolds Newbury
Abstract: Doppler-broadened methane lines around 3.4 {mu}m are measured with a coherent dual-comb spectrometer with an absolute-frequency axis. The obtained accuracy of the line-center frequency is 300 kHz, about 1 part per thousand of the linewidth.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909489

26. Sub-micron absolute distance measurements in sub-millisecond times with dual free-running femtosecond Er fiber-lasers
Topic: Optical Physics
Published: 9/12/2011
Authors: Tze-An Lui, Nathan Reynolds Newbury, Ian R Coddington
Abstract: We demonstrate a simplified dual-comb lidar setup for precision absolute ranging that can achieve a ranging precision at a meter of 2 {mu}m in 140 {mu}s acquisition time. With averaging, the precision drops below 1 micron at 0.8 msec and below 200 nm ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908892

27. Precision spectroscopy with frequency combs at 3.4 {mu}m
Topic: Optical Physics
Published: 8/2/2011
Authors: Esther Baumann, Fabrizio Raphael Giorgetta, William C Swann, Alexander M. Zolot, Ian R Coddington, Nathan Reynolds Newbury
Abstract: We discuss precision spectroscopy with a comb-based spectrometer at 3.4 {mu}m. Our goal is to explore comb-based spectroscopy as an alternative method for fast, highly resolved, accurate measurements of gas line shapes. The spectrometer uses dual 1.5 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909488

28. Microresonator based optical frequency combs
Topic: Optical Physics
Published: 4/29/2011
Authors: Scott A Diddams, T. J. Klippenberg
Abstract: Optical frequency combs based on mode-locked laser sources have provided unprecedented measurement capabilities for optical frequencies, enabling new applications in a wide range of topics that include atomic clocks, ultracold gases, molecular finge ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906925

29. Nested Uncertainties and Hybrid Metrology to Improve Measurement Accuracy
Topic: Optical Physics
Published: 4/18/2011
Authors: Richard M Silver, Nien F Zhang, Bryan M Barnes, Hui Zhou, Jing Qin, Ronald G Dixson
Abstract: In this paper we present a method to combine measurement techniques that reduce uncertainties and improve measurement throughput. The approach has immediate utility when performing model-based optical critical dimension measurements. When modeling ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908290

30. Characterization of an actively linearized ultra-broadband chirp laser with a fiber-laser optical frequency comb
Topic: Optical Physics
Published: 3/25/2011
Authors: Zeb W Barber, Jason Dahl, Peter Roos, Randy Reibel, Nathan Greenfield, Fabrizio Raphael Giorgetta, Ian R Coddington, Nathan Reynolds Newbury
Abstract: The optical frequency sweep of an actively linearized, ultra-broadband, chirped laser source is characterized through optical heterodyne detection against fiber-laser frequency combs. Frequency sweeps were measured over approximately 4.7 THz bandwidt ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907529



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