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You searched on: Topic Area: Optical Physics

Displaying records 21 to 30 of 42 records.
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21. A versatile light-emitting-diode-based spectral response measurement system for photovoltaic device characterization
Topic: Optical Physics
Published: 6/29/2012
Authors: Behrang H Hamadani, John F Roller, Brian P Dougherty, Howard W Yoon
Abstract: An absolute differential spectral response measurement system for solar cells is presented. The system couples an array of light emitting diodes (LEDs) with an optical waveguide to provide large area illumination. Two unique yet complementary measur ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910849

22. 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

23. Calibration of an Astrophysical Spectrograph below 1 m/s using a Laser Frequency Comb
Topic: Optical Physics
Published: 6/4/2012
Authors: David F Phillips, Alexander G Glenday, Chih-hao Li, Claire Elizabeth Cramer, Gabor Furesz, Guoquing Chang, Andrew Benedick, Li-Jin Chen, F X Kaertner, Sylvain G Korzennik, Dimitar Sasselov, Andrew Szentgyorgyi, Ronald L Walsworth
Abstract: We deployed two wavelength calibrators based on laser frequency combs (,astro-combsŠ) at an astronomical observatory. One astro-comb operated over a 100 nm band in the deep red ( 800 nm) and a second operated over a 20 nm band in the blue ( 400 nm) ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911144

24. 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

25. 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

26. 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

27. 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

28. Real-time polarization microscopy for probing local distributions of biomolecules
Topic: Optical Physics
Published: 2/28/2011
Authors: Jeeseong Hwang, Ji Y. Lee, John F. Lesoine, Hyeong Gon Kang, Matthew Lawrence Clarke, Robert C. Chang
Abstract: We present real-time, full-field, fluorescence polarization microscopy and its calibration and validation methods to monitor the absorption dipole orientation of fluorescent molecules. A quarter-wave plate, in combination with a liquid crystal varia ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907839

29. Electron Vortex Beams with High Quanta of Orbital Angular Momentum
Topic: Optical Physics
Published: 1/14/2011
Authors: Benjamin James McMorran, Amit Kumar Agrawal, Ian M. Anderson, Andrew A Herzing, Henri J Lezec, Jabez J McClelland, John Unguris
Abstract: Analogous to vortices in light optical beams, electron optical beams with helical wavefronts carry orbital angular momentum and promise new capabilities for electron microscopy and other applications. We use nanofabricated diffraction holograms in an ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906991

30. Efficient fiber optic detection of trapped ion flourescence
Topic: Optical Physics
Published: 7/9/2010
Authors: Aaron Vandevender, Yves Colombe, Jason Amini, Dietrich G Leibfried, David J Wineland
Abstract: Integration of fiber optics may play a critical role in the development of quantum information processors based on trapped ions, atoms, and quantum dots. Fibers could help enable a scalable and efficient means of collecting light from and deliverin ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905197



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