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Search Publications by: Ian Coddington (Fed)

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Displaying 126 - 150 of 250

A coherent dual-comb spectrometer at 3.4 ym for accurate line center measurement of methane

October 10, 2011
Author(s)
Esther Baumann, Fabrizio R. Giorgetta, Ian R. Coddington, William C. Swann, Alexander M. Zolot, Nathan R. Newbury
Doppler-broadened methane lines around 3.4 υm are measured with a coherent dual-comb spectrometer with an absolute-frequency axis. The obtained accuracy of the line-center frequency is 300 kHz, about 1 part per thousand of the linewidth.

Dual-comb-based characterization of rapidly tuned lasers

October 10, 2011
Author(s)
Fabrizio R. Giorgetta, Esther Baumann, Ian R. Coddington, William C. Swann, Nathan R. Newbury, Zeb W. Barber, Peter Roos
We demonstrate a technique to calibrate the instantaneous frequency versus time from a rapidly tuned cw laser. Our dual-comb-based spectrometer can measure optical waveforms tuned at 1500-THz/s rates over 5-THz bandwidths at high precision.

Dual comb-based characterization of rapidly tuned lasers

August 13, 2011
Author(s)
Fabrizio R. Giorgetta, Esther Baumann, Ian R. Coddington, William C. Swann, Nathan R. Newbury, Zeb Barber, Peter Roos
Time-resolved, high-accuracy and high-resolution spectroscopy of rapidly tuned cw lasers is critical to realizing their full potential for sensing, but is not possible with conventional spectrometers. We demonstrate a coherent dual-comb-based spectrometer

Precision spectroscopy with frequency combs at 3.4 ym

August 2, 2011
Author(s)
Esther Baumann, Fabrizio R. Giorgetta, William C. Swann, Alexander M. Zolot, Ian R. Coddington, Nathan R. Newbury
We discuss precision spectroscopy with a comb-based spectrometer at 3.4 υm. 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 υm

Frequency-comb based approaches to precision ranging laser radar

June 20, 2011
Author(s)
Nathan R. Newbury, Tze-Ann Liu, Ian R. Coddington, Fabrizio R. Giorgetta, Esther Baumann, William C. Swann
The output of pulsed femtosecond lasers can be controlled to generate pulse trains with very precise timing and optical frequency. This source can be used in different ways to support precision coherent LIDAR. We will discuss several implementations of

Dual comb spectroscopy from 1.25 to 1.7 ym

May 1, 2011
Author(s)
Alexander M. Zolot, Ian R. Coddington, Fabrizio R. Giorgetta, Esther Baumann, William C. Swann, Nathan R. Newbury
A coherent dual comb spectrometer spanning much of the near infrared was constructed from broadened erbium fiber lasers. Gas phase water, methane and acetylene spectra were measured and characterized toward establishing new frequency standards.

Dual-comb based measurement of frequency agile lasers.

May 1, 2011
Author(s)
Ian R. Coddington, Fabrizio R. Giorgetta, Esther Baumann, William C. Swann, Nathan R. Newbury
Properly stabilized, frequency combs form high accuracy references across much of the optical spectrum. Here we employ dual frequency combs to harness this accuracy for fast and high resolution measurements of swept CW sources.

Characterizing arbitrary CW waveforms with 1500 THz/s chirp rates

April 5, 2011
Author(s)
Ian R. Coddington, Fabrizio R. Giorgetta, Esther Baumann, William C. Swann, Nathan R. Newbury
A Dual frequency comb interferometer was constructed to monitor cw laser chirp rates exceeding 1500 THz/s with MHz level resolution and accuracy over a 3 THz spectral sweep. Monitoring of the chirped laser is continuous. Additionally, absolute frequency

Characterization of an actively linearized ultra-broadband chirp laser with a fiber-laser optical frequency comb

March 25, 2011
Author(s)
Zeb W. Barber, Jason Dahl, Peter Roos, Randy Reibel, Nathan Greenfield, Fabrizio R. Giorgetta, Ian R. Coddington, Nathan R. Newbury
The optical frequency sweep of an actively linearized, ultra-broadband, chirped laser source is characterized through optical heterodyne detection against fiber-laser frequency combs. Frequency sweeps were measured over approximately 4.7 THz bandwidths

Rapid, high resolution frequency comb measurements

February 13, 2011
Author(s)
Ian R. Coddington, Fabrizio R. Giorgetta, Esther Baumann, William C. Swann, Nathan R. Newbury
Frequency combs serve as an extremely high accuracy reference across broad portions of the optical spectrum. Dual frequency combs harness this accuracy and allow for fast and highly flexible measurements of passive and active sources.

Performance of a coherent dual frequency comb spectrometer

January 1, 2011
Author(s)
Nathan R. Newbury, Esther Baumann, Ian R. Coddington, Fabrizio R. Giorgetta, William C. Swann, Alexander M. Zolot
We discuss the performance of a coherent dual frequency comb spectrometer in terms of signal-to-noise ratio, resolution, and accuracy based on experimental data in the near and short-wave infrared centered at 1.5 and 3.4 micrometers.

High precision, broadband optical measurements with fiber laser frequency combs

November 2, 2010
Author(s)
Nathan R. Newbury, Ian R. Coddington, Esther Baumann, Fabrizio R. Giorgetta, William C. Swann, Alexander M. Zolot
Optical frequency combs have been used extensively, and with remarkable success, to measure the absolute frequency of cw lasers. The use of frequency combs has also expanded to include applications such as precision ranging, component metrology, and