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You searched on: Topic Area: Optical Physics

Displaying records 31 to 40 of 50 records.
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31. 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) ...

32. 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 ...

33. 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 ...

34. 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 ...

35. 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 ...

36. 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 (Hyeonggon) 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 ...

37. 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 ...

38. 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 ...

39. Femtosecond frequency comb measurement of absolute frequencies and hyperfine coupling constants in cesium vapor
Topic: Optical Physics
Published: 4/29/2010
Authors: Jason Stalnaker, Vela Mbele, Vladislav Gerginov, Tara Michele Fortier, Scott A Diddams, Leo Hollberg, C E Tanner
Abstract: We report measurements of absolute transition frequencies and hyperfine coupling constants for the 8S1/2 , 9S1/2 , 7D3/2 , and 7D5/2 states in 133 Cs vapor. The stepwise excitation through either the 6P1/2 or 6P3/2 intermediate state is perform ...

40. Sensitivity Comparison of Mx and Frequency Modulated Bell-Bloom Cs Magnetometers in a Micro-Fabricated Cell
Topic: Optical Physics
Published: 2/1/2010
Authors: Ricardo Jimenez Martinez, William C. Griffith, Ying-ju Wang, Svenja A Knappe, John E Kitching, Ken Smith, Mark Prouty
Abstract: We compare the sensitivity performance of two optically pumped atomic magnetometers based on the Mx and frequency-modulated Bell-Bloom configurations. The Cs magnetometers are implemented using a millimeter-scale microfabricated vapor cell in a confi ...

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