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Displaying records 41 to 50 of 789 records.
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41. A circular dielectric grating for vertical extraction of single quantum dot emission
Topic: Physics
Published: 7/25/2011
Authors: Marcelo Ishihara Davanco, Matthew T. Rakher, Dieter Schuh, Antonio Badolato, Kartik A Srinivasan
Abstract: We demonstrate a suspended circular grating composed of partially etched annular trenches in a thin GaAs membrane, designed for e±cient and moderately broadband ( approx. 5 nm) extraction of emission from single InAs quantum dots. Simulations indic ...

42. A collapse of the cross-spectral function in phase noise metrology
Topic: Physics
Published: 2/25/2014
Authors: Craig W Nelson, Archita Hati, David Allan Howe
Abstract: Cross-spectral analysis is a mathematical tool for extracting the power spectral density of a correlated signal from two time series in the presence of uncorrelated interfering signals. We demonstrate and explain a set of conditions where the detect ...

43. A common-view disciplined oscillator
Topic: Physics
Published: 5/24/2010
Authors: Michael A Lombardi, Aaron P Dahlen
Abstract: This paper describes a common-view disciplined oscillator (CVDO) that locks to a reference time scale through the use of common-view Global Positioning System (GPS) satellite measurements. A Proportional-Integral-Derivative (PID) controller obtains ...

44. A compact phase delay technique for increasing the amplitude of coherent population trapping resonances in open Lambda systems
Topic: Physics
Published: 8/1/2006
Authors: V Shah, Svenja A Knappe, P Schwindt, Vladislav Gerginov, John E Kitching, Leo W. Hollberg
Abstract: We propose and demonstrate a novel technique for increasing the amplitude of coherent population trapping (CPT) resonance in open Lambda systems. The technique requires no complex modifications to the conventional CPT setup and is compatible with sta ...

45. A critical compilation of energy levels, spectral lines, and transition probabilities of singly ionized silver, Ag II
Series: Journal of Research (NIST JRES)
Report Number: 118.009
Topic: Physics
Published: 4/15/2013
Author: Alexander Kramida
Abstract: All available experimental measurements of the spectrum of the Ag+ ion are critically reviewed. Systematic shifts are removed from the measured wavelengths. The compiled list of critically evaluated wavelengths is used to derive a comprehensive l ...

46. A deep-UV optical frequency comb at 205 nm
Topic: Physics
Published: 5/25/2009
Authors: Scott A Diddams, E Peters, P Fendel, S Reinhardt, T W Hansch, T Udem
Abstract: By frequency quadrupling a picosecond pulse train from a Ti:sapphire laser at 820 nm we generate a frequency comb at 205 nm with nearly bandwidth-limited pulses. The nonlinear frequency conversion is accomplished by two successive frequency doubling ...

47. A digital time scale at the National Institute of Standards and Technology
Topic: Physics
Published: 8/13/2011
Authors: Stefania Romisch, Steven R Jefferts, Thomas Edward Parker
Abstract: An integrated time scale has as primary data unit of duration (time interval) defined by atomic standards according to the definition of the SI second. The availability of more than one atomic standard allows for averaging, thereby improving the perf ...

48. A frequency-stabilized Yb:KYW femtosecond laser frequency comb and its application to low-phase noise microwave generation
Topic: Physics
Published: 3/16/2013
Authors: Scott A Diddams, Stephanie Meyer, Tara Michele Fortier, Steve Lecomte
Abstract: We present an optically-stabilized Yb:KYW fs-laser frequency comb. We use an f-2f nonlinear interferometer to measure the carrier envelope offset frequency (f^d0^) and the heterodyne beatnote between the comb and a stable CW laser at 1068 nm to detec ...

49. A high stability optical frequency reference based on thermal calcium atoms
Topic: Physics
Published: 5/24/2012
Authors: Richard W Fox, Jeffrey A Sherman, W. Douglas, Judith Berget Olson, Andrew D Ludlow, Christopher W Oates
Abstract: Here we report an imprecision below 10^u-14^ with a simple, compact optical frequency standard based upon thermal calcium atoms. Using a Ramsey-Borde spectrometer we excite features with linewidths < 5 kHz for the ^u1^S^d0^-^u3^P^d1^ intercombinati ...

50. A hybrid 10 GHz photonic-microwave oscillator with sub-femtosecond absolute timing jitter
Topic: Physics
Published: 5/24/2012
Authors: Tara Michele Fortier, Craig W Nelson, Archita Hati, Franklyn J Quinlan, Jennifer A. Taylor, Haifeng (Haifeng) Jiang, Chin W. Chou, Nathan D. Lemke, Andrew D Ludlow, David Allan Howe, Christopher W Oates, Scott A Diddams
Abstract: We demonstrate a 10 GHz hybrid oscillator comprised of a phase stabilized optical frequency comb divider and a room temperature dielectric sapphire oscillator. Characterization of the 10 GHz microwave signal via comparison of two independent hybrid ...

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