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Search Publications by: Scott Diddams (Assoc)

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Displaying 176 - 200 of 320

Absolute Optical Frequency Measurements with a Fractional Uncertainty at 1 x 10 -15

June 5, 2006
Author(s)
Jason Stalnaker, Scott A. Diddams, Leo W. Hollberg, Kyoungsik Kim, Elizabeth A. Donley, Thomas P. Heavner, Steven R. Jefferts, Filippo Levi, Thomas E. Parker, James C. Bergquist, Wayne M. Itano, Marie J. Jensen, Luca Lorini, Windell Oskay, Tara M. Fortier, J Torgerson
We report the technical details specific to our recent measurements of the optical frequency of the mercury single-ion clock in terms of the SI second as realized by the NIST-F1 cesium fountain clock. In these measurements the total fractional uncertainty

Optical and microwave frequency synthesis with an integrated fiber frequency comb

June 5, 2006
Author(s)
Ingmar Hartl, Martin E. Fermann, William C. Swann, John J. McFerran, Ian R. Coddington, Qudsia Quraishi, Scott Diddams, Nathan R. Newbury, Carston Langrock, Martin M. Fejer, Paul S. Westbrook, Jeffrey W. Nicholson, K Feder
We demonstrate optical coherence over a broad spectral range of two independent fiber frequency combs. Additionally, we demonstrate microwave stability of better than 2x10 -14 in 1 second for an optically integrated fiber frequency comb.

Stability measurements of the Ca and Yb Optical Frequency Standards

June 5, 2006
Author(s)
Christopher W. Oates, C Hoyt, Yann Le Coq, Zeb Barber, Tara M. Fortier, Jason Stalnaker, Scott A. Diddams, Leo W. Hollberg
In this paper we describe two types of optical atomic clocks. The first is based on freely expanding calcium atoms and is optimized for experimental simplicity and high stability. The second is based on Yb atoms confined to an optical lattice that is

Optical and microwave frequency synthesis with an integrated fiber frequency comb

May 21, 2006
Author(s)
L Hartl, Martin E. Fermann, W Swann, John J. McFerran, Ian R. Coddington, Qudsia Quraishi, Scott A. Diddams, Nathan R. Newbury, Carston Langrock, M M. Fejer, P. S. Westbrook, Jeffrey W. Nicholson, K Feder
We demonstrate optical coherence over a broad spectral range of two independent fiber frequency combs. Additionally, we demonstrate microwave stability of better than 2x10 -14 in 1 second for an optically integrated fiber frequency comb.

Phase-stabilized ultrafast lasers signal new era in measurement and research

May 15, 2006
Author(s)
Tara M. Fortier, A Bartels, Scott A. Diddams
The development of short-pulsed lasers has progressed steadily over the past 30 years. In the search for better techniques and materials to generate shorter and shorter pulses, the 1990?s witnessed the arrival of Kerr-lens mode-locked Ti:sapphire lasers as

Phase-Stabilized Ultrafast Lasers Signal New Era Measurement and Research

May 1, 2006
Author(s)
Tara M. Fortier, A Bartels, Scott A. Diddams
The development of short pulsed lasers has progressed steadily over the past 30 years. In the search for better techniques and materials to generate shorter and shorter pulses, the 1990's witnessed the arrival of Kerr-lens mode locked Ti:sapphire lasers as

Optical frequency measurements of 6s 2 S 1/2 - 6p 2 P 1/2 (D 1 )transitions in 133 Cs and their impact on the fine-structure constant

March 8, 2006
Author(s)
Vladislav Gerginov, K Calklins, B Tanner, John J. McFerran, Scott A. Diddams, Albrecht Bartels, Leo W. Hollberg
High resolution laser spectroscopy of 6s 2S 1/2 – 6p 2P 1/2 transition (D 1 line) in neutral 133Cs is performed in a highly collimated thermal atomic beam using a femtosecond laser frequency comb and narrow linewidth diode laser. The diode laser is offset

Optical frequency measurements of 6s 2 S 1/2 - 6p 2 P 1/2 (D1) transitions in 133 Cs and their impact on the fine-structure constant

March 8, 2006
Author(s)
Vladislav Gerginov, K Calklins, Carol Tanner, John J. McFerran, Scott A. Diddams, A Bartels, Leo W. Hollberg
High resolution laser spectroscopy of 6s 2S 1/2 – 6p 2P 1/2 transition (D1 line) in neutral 133Cs is performed in a highly collimated thermal atomic beam using a femtosecond laser frequency comb and narrow linewidth diode laser. The diode laser is offset

Improved stabilization of a 1.3 um femtosecond optical frequency comb using spectrally tailored continuum from a nonlinear fiber grating

January 15, 2006
Author(s)
Kyoungsik Kim, Leo W. Hollberg, Scott A. Diddams, P. S. Westbrook, Jeffrey W. Nicholson
We report the significant enhancement ($+$24 dB) of the optical beat note between a 657-nm cw laser and the second-harmonic generation of the tailored continuum at 1314 nm generated with a femtosecond Cr:forsterite laser and a nonlinear fiber Bragg grating

Improved stabilization of a 1.3 um femtosecond optical frequency comb using spectrally-tailored continuum from a nonlinear fiber grating

January 1, 2006
Author(s)
Kyoungsik Kim, Leo W. Hollberg, Scott A. Diddams, P. S. Westbrook, Jeffrey W. Nicholson, K Feder
We report the significant enhancement ($+$24 dB) of the optical beat note between a 657-nm cw laser and the second-harmonic generation of the tailored continuum at 1314 nm generated with a femtosecond Cr:forsterite laser and a nonlinear fiber Bragg grating

Optical Oscillators with High Stability and Low Timing Jitter

October 22, 2005
Author(s)
Leo W. Hollberg, Christopher W. Oates, Scott A. Diddams
Frequency stabilized cw lasers achieve exceptional frequency stability using high finesse Fabry-Perot cavities. That stability can be transferred to other optical frequencies with mode-locked lasers and provides optical and electronic pulses with ultra-low

Noise Properties of Microwave Signals Synthesized with Femtosecond Lasers

August 29, 2005
Author(s)
Eugene N. Ivanov, John J. McFerran, Scott A. Diddams, Leo W. Hollberg
We discuss various aspects of high resolution phase noise measurements at microwave frequencies. This includes methods to achieve thermal noise limited sensitivity and improved immunity to amplitude fluctuations of microwave signals. A few prototype

High resolution spectroscopy with a femtosecond laser frequency comb

July 25, 2005
Author(s)
Vladislav Gerginov, C E. Tanner, Scott A. Diddams, A Bartels, Leo W. Hollberg
The output of a mode-locked femtosecond-laser is usd for high resolution spectroscopy of Cs in an atomic beam. The laser is referenced directly to the stable RF signal from the NIST time-scale. By changing the laser's rate, the Cs D 1 and D 2 transitions

Optical frequency metrology using spectrally tailored continuum from a nonlinear fiber grating

July 25, 2005
Author(s)
Kyoungsik Kim, Brian R. Washburn, C. W. Oates, Leo W. Hollberg, Nathan R. Newbury, Scott Diddams, Paul S. Westbrook, Jeffrey W. Nicholson, K Feder
We report the significant enhancement (24 dB) of the optical beat note between a 657-nm CW laser and the tailored continuum generated with a nonlinear fiber Bragg grating. The same continuum is used to stabilize the offset frequency of a Cr:forsterite

Optical frequency metrology using spectrally tailored continuum from a nonlinear fiber grating

July 25, 2005
Author(s)
Kyoungsik Kim, Brian R. Washburn, Christopher W. Oates, Leo W. Hollberg, Nathan R. Newbury, Scott A. Diddams, P. S. Westbrook, Jeffrey W. Nicholson, K Feder
We report the significant enhancement (-24 dB) of the optical beat note between a 657-nm CW laser and the tailored continuum generated with a nonlinear fiber Bragg grating. The same continuum is used to stabilize the offset frequency of a Cr:forsterite