Decade-spanning high-precision terahertz frequency comb.

Authors:
Dr Marco A Allodi, PhD
Dr Marco A Allodi, PhD
The University of Chicago
Yen Postdoctoral Scholar
Laser Spectroscopy, Molecular Dynamics, Biophysics, Astrochemistry
Chicago, IL | USA

Phys Rev Lett 2015 Apr 21;114(16):163902. Epub 2015 Apr 21.

Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.

The generation and detection of a decade-spanning terahertz (THz) frequency comb is reported using two Ti:sapphire femtosecond laser oscillators and asynchronous optical sampling THz time-domain spectroscopy. The comb extends from 0.15 to 2.4 THz, with a tooth spacing of 80 MHz, a linewidth of 3.7 kHz, and a fractional precision of 1.8×10^{-9}. With time-domain detection of the comb, we measure three transitions of water vapor at 10 mTorr between 1-2 THz with an average Doppler-limited fractional accuracy of 6.1×10^{-8}. Significant improvements in bandwidth, resolution, and sensitivity are possible with existing technologies.

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http://dx.doi.org/10.1103/PhysRevLett.114.163902DOI Listing

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April 2015
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References

(Supplied by CrossRef)

S. T. Cundiff et al.
2005

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