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Displaying 151 - 175 of 225

Fiber laser-based frequency combs with high relative frequency stability

May 28, 2007
Author(s)
Nathan R. Newbury, William C. Swann, Ian R. Coddington, J. C. Bergquist, Scott Diddams, Luca Lorini
We describe our current low-noise fiber-laser frequency comb and present measurements of its residual instability. Through a comparison with a Ti:Sapphire frequency comb, we measure residual fractional frequency instabilities (Allan deviation) of 6x10 -17

Fiber-laser frequency combs

May 6, 2007
Author(s)
Nathan R. Newbury, William C. Swann
We discuss the contributions to the linewidth and frequency noise of the individual modes of a mode-locked fiber laser. Much of this noise can be suppressed through feedback to form a stable frequency comb.

Multi-octave optical coherence spanning hundreds of meters

May 6, 2007
Author(s)
Ian R. Coddington, Luca Lorini, William C. Swann, J. C. Bergquist, Y. Le Coq, C. W. Oates, Qudsia Quraishi, Jason Stalnaker, Scott Diddams, Nathan R. Newbury
We demonstrate coherent transfer of optical signals with radian level noise (in a 3.5 MHz bandwidth) through a series of laser systems spanning from 657 nm to 1535 nm and several hundred meter distances.

Residual stability of a fiber-based frequency comb

May 6, 2007
Author(s)
William C. Swann, Ian R. Coddington, Luca Lorini, Jason Stalnaker, J. C. Bergquist, Scott Diddams, Nathan R. Newbury
Abstract: We present measurements of the residual frequency stability across a fiber frequency comb by comparison through a Ti:sapphire frequency comb. We find 6 x 10 -17 stability at one second and 1 x 10 -18 at 1000 seconds.

Coherent optical link over hundreds of metres and hundreds of terahertz with subfemtosecond timing jitter

May 1, 2007
Author(s)
Ian R. Coddington, William C. Swann, Luca Lorini, J. C. Bergquist, K Feder, Y. Le Coq, Jeffrey W. Nicholson, C. W. Oates, Qudsia Quraishi, Paul S. Westbrook, Scott Diddams, Nathan R. Newbury
Recent developments in stabilized lasers have resulted in ultrastable optical oscillators with spectral purities below 1 Hz refs 1-6. These oscillators are not transportable at present and operate at a single frequency. To realize their full potential, a

Radian-level coherent optical links over 100's of meters and 100's of terahertz

January 18, 2007
Author(s)
Ian R. Coddington, Qudsia Quraishi, Luca Lorini, William C. Swann, J. C. Bergquist, C. W. Oates, Scott Diddams, Nathan R. Newbury
We demonstrate coherent transfer of optical signals with radian level noise (in a 25 MHz bandwidth) through a series of laser systems spanning from 657 nm to 1550 nm over several hundred meter distances.

Fiber-laser frequency combs with subhertz relative linewidths

October 15, 2006
Author(s)
William C. Swann, John J. McFerran, Ian R. Coddington, Nathan R. Newbury, Ingmar Hartl, Martin E. Fermann, Paul S. Westbrook, Jeffrey W. Nicholson, K Feder, Carston Langrock, Martin M. Fejer
We investigate the comb linewidths of self-referenced, fiber-laser-based frequency combs by measuring the heterodyne beat signal between two independent frequency combs that are phase locked to a common cw optical reference. We demonstrate that the optical

Fiber Frequency Combs: Development and Applications

September 19, 2006
Author(s)
Nathan R. Newbury, William C. Swann, Ian R. Coddington, John J. McFerran
The output of a femtosecond fiber laser provides a comb of lines in frequency space that can be phase-locked to either a microwave or optical reference to form a stable frequency comb. We discuss the basic configuration of fiber laser-based frequency combs

Elimination of pump-induced frequency jitter on fiber-laser frequency combs

July 1, 2006
Author(s)
John J. McFerran, William C. Swann, Brian R. Washburn, Nathan R. Newbury
Optical frequency combs generated by femtosecond fiber lasers typically exhibit significant frequency noise that causes broad optical linewidths, particularly in the comb wings and in the carrier-envelope offset frequency (fceo) signal. We show these broad

Reducing the linewidth of fiber-laser frequency combs

June 30, 2006
Author(s)
Nathan R. Newbury, John J. McFerran, William C. Swann
Fiber laser-based frequency combs typically exhibit broad optical linewidths, particularly in the wings. These broadened linewidths originate from white amplitude noise on the pump laser, which can be eliminated to achieve sub-Hz offset frequency

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.

Frequency-Resolved Coherent LIDAR using a Femtosecond Fiber Laser

May 21, 2006
Author(s)
William C. Swann, Nathan R. Newbury
We present a frequency comb-based, frequency-resolved coherent LIDAR (FReCL) that provides higher performance than that of conventional pulsed range/Doppler LIDARs, dramatically reduces local oscillator timing requirements, and compensates for path

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.

Frequency-Resolved Coherent LIDAR using a Femtosecond Fiber Laser

March 15, 2006
Author(s)
William C. Swann, Nathan R. Newbury
We demonstrate a coherent lidar that uses a broadband femtosecond fiber laser as a source and resolves the returning heterodyne signal into N spectral channels by using an arrayed-waveguide grating. The data are processed incoherently to yield an N-times

Response Dynamics of the Frequency Comb Output from a Femtosecond Fiber Laser

December 26, 2005
Author(s)
Brian Washburn, William C. Swann, Nathan R. Newbury
The frequency comb from a mode-locked fiber laser can be stabilized through feedback to the pump power. An understanding of the mechanisms and bandwidth governing this feedback is of practical importance for frequency comb design and of basic interest

Wavelength References for Interferometry in Air

December 12, 2005
Author(s)
Richard W. Fox, Brian R. Washburn, Nathan R. Newbury, Leo W. Hollberg
Interferometer sources with multiple known wavelengths can be provided by tunable lasers and calibrated optical reference cavities. The mode wavelengths are known by measuring a laser¿s frequency while locked to the mode in vacuum during a calibration step

Wavelength references for interferometry in air

December 1, 2005
Author(s)
R W. Fox, Brian R. Washburn, Nathan R. Newbury, Leo W. Hollberg
Cavity-mode wavelengths in air are determined by measuring a laser's fequency while it is locked to the mode in vacuum during a caibration step and subsequently correcting the mode wavelength for atmospheric pressure compression, temperature difference

Theory of the Frequency Comb Output from a Femtosecond Fiber Laser

November 1, 2005
Author(s)
Nathan R. Newbury, Brian Washburn
The output of a femtosecond fiber laser will form a frequency comb that can be phase-locked through feedback to the cavity length and pump power. A perturbative theory is developed to describe this frequency comb output, in particular for a solitonic fiber

High-accuracy near infrared wavelength and frequency reference developments at NIST

September 23, 2005
Author(s)
William C. Swann, Sarah L. Gilbert, Brian Washburn, Nathan R. Newbury
NIST research on near infrared frequency and wavelength references is presented. A new high accuracy wavelength calibration transfer standard, SRM 2519a, based on molecular absorption lines of H13C14N is described. Research on optical frequency combs

Fiber Laser Frequency Combs and their Control

July 25, 2005
Author(s)
Nathan R. Newbury, Brian Washburn, William C. Swann, Jeffrey W. Nicholson, K Feder, Paul S. Westbrook
Fiber laser-based frequency combs can provide a comb of well-defined spectral lines across the near-infrared, including the telecommunication. We discuss these frequency combs with an emphasis on the mechanisms used to phase-lock the combs.

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

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
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