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Topic Area: Optical Physics
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Displaying records 11 to 20 of 67 records.
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11. Modulated photocurrent spectroscopy of CdTe/CdS solar cells-equivalent circuit analysis
Topic: Optical Physics
Published: 5/20/2013
Authors: Behrang H Hamadani, John F Roller, Kounavis Panagiotis, Nikolai B Zhitenev, David J Gundlach
Abstract: We have used the technique of photocurrent modulated spectroscopy to investigate the dynamic response of charge carrier transport in thin film CdTe/CdS solar cells as a function of light bias and temperature over a broad excitation frequency range. T ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912092

12. Random testing reveals excessive power in commercial laser pointers
Topic: Optical Physics
Published: 5/1/2013
Authors: Joshua Aram Hadler, Edna L Tobares, Marla L Dowell
Abstract: In random testing of 122 commercial laser pointers, we observed that 89.7 % of green pointers and 44.4 % of red pointers were not in compliance with the Code of Federal Regulations, producing laser power in excess of the Accessible Emission Limit at ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912603

13. Accurate, inexpensive testing of handheld lasers for safe use and operation
Topic: Optical Physics
Published: 3/7/2013
Authors: Marla L Dowell, Joshua Aram Hadler
Abstract: An accurate, inexpensive test bed for measurements of optical power emitted from handheld lasers is described. Our test bed consists of a thermopile detector, bandpass optical filters, an adjustable iris, and self-centering holders for mounting of th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912781

14. Experimental demonstration of a receiver beating the standard quantum limit for multiple nonorthogonal coherent-state discrimination
Topic: Optical Physics
Published: 1/6/2013
Authors: Francisco E. Becerra Chavez, Jingyun Fan, Gerald Baumgartner, Julius Goldhar, Jonathan Kosloski, Alan L Migdall
Abstract: The measurement of the state of a quantum system with inherent quantum uncertainty (noise) approaching the ultimate physical limits is of both technological and fundamental interest. Quantum noise prevents any mutually nonorthogonal quantum states ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912063

15. Ultrafast element-specific magnetization Dynamics of complex magnetic materials on a table-top
Topic: Optical Physics
Published: 12/21/2012
Authors: Thomas J Silva, Justin M Shaw, Hans T. Nembach, Chan La-O-Vorakiat, Henry C. Kapteyn, Margaret M. Murnane, Stefan Mathias, Roman Adam, Patrik Grychtol, Martin Aeschlimann, Claus M. Schneider, Emrah Turgut, Dennis Rudolf
Abstract: We review recent progress in femtosecond magnetization dynamics probed by extreme ultraviolet pulses from high-harmonic generation. In a transverse magneto-optical Kerr geometry, we establish an ultrafast, element-specific experimental capability - ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904322

16. Application of nanoporous silicon substrates for terahertz spectroscopy
Topic: Optical Physics
Published: 12/20/2012
Authors: Edwin J Heilweil, Shu-Zee A. Lo, Gagan Kumar, Thomas E. Murphy
Abstract: Infrared spectroscopy is a valuable tool for probing and characterizing the macro-molecular motions of complex molecules, including vibrational and phonon modes that cannot be easily accessed through visible spectroscopy. We describe here an impro ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912179

17. Remote sensing of chiral signatures on Mars
Topic: Optical Physics
Published: 11/1/2012
Authors: William Sparks, James H. Hough, Thomas Avery Germer, Frank Robb, Ludmilla Kolokolova
Abstract: We describe circular polarization as a remote sensing diagnostic of chiral signatures which may be applied to Mars. The remarkable phenomenon of homochirality provides a unique biosignature which can be amenable to remote sensing through circular ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910692

18. Quasianalytical modal approach for computing Casimir interactions in periodic nanostructures
Topic: Optical Physics
Published: 10/3/2012
Authors: Francesco Intravaia, Paul S Davids, Ricardo Decca, Vladimir A Aksyuk, Daniel Lopez, Diego A. R. Dalvit
Abstract: We present an almost fully analytical technique for computing Casimir interactions between 1D periodic lamellar gratings based on a modal approach. Our method improves on previous work on Casimir modal approaches for nanostructures by using the exa ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912110

19. Extending single-photon optimized superconducting transition edge sensors beyond the single-photon counting regime
Topic: Optical Physics
Published: 10/2/2012
Authors: Thomas Gerrits, Brice R. Calkins, Nathan A Tomlin, Adriana Eleni Lita, Alan L Migdall, Richard P Mirin, Sae Woo Nam
Abstract: Typically, transition edge sensors resolve photon number of up to 10 or 20 photons, depending on the wavelength and TES design. We extend that dynamic range up to 1000 photons, while maintaining sub- shot noise detection process uncertainty of the n ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911617

20. Book Review: Nonlinear Laser Dynamics: From Quantum Dots to Cryptography
Topic: Optical Physics
Published: 9/24/2012
Author: Gregg M. Gallatin
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911990



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