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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 17 — Aug. 26, 2013
  • pp: 19743–19749

Segmented chirped-pulse Fourier transform submillimeter spectroscopy for broadband gas analysis

Justin L. Neill, Brent J. Harris, Amanda L. Steber, Kevin O. Douglass, David F. Plusquellic, and Brooks H. Pate  »View Author Affiliations


Optics Express, Vol. 21, Issue 17, pp. 19743-19749 (2013)
http://dx.doi.org/10.1364/OE.21.019743


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Abstract

Chirped-pulse Fourier transform spectroscopy has recently been extended to millimeter wave spectroscopy as a technique for the characterization of room-temperature gas samples. Here we present a variation of this technique that significantly reduces the technical requirements on high-speed digital electronics and the data throughput, with no reduction in the broadband spectral coverage and no increase in the time required to reach a given sensitivity level. This method takes advantage of the frequency agility of arbitrary waveform generators by utilizing a series of low-bandwidth chirped excitation pulses paired in time with a series of offset single frequency local oscillators, which are used to detect the molecular free induction decay signals in a heterodyne receiver. A demonstration of this technique is presented in which a 67 GHz bandwidth spectrum of methanol (spanning from 792 to 859 GHz) is acquired in 58 μs.

© 2013 OSA

OCIS Codes
(040.6070) Detectors : Solid state detectors
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(300.6240) Spectroscopy : Spectroscopy, coherent transient
(300.6310) Spectroscopy : Spectroscopy, heterodyne
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Spectroscopy

History
Original Manuscript: April 22, 2013
Revised Manuscript: June 6, 2013
Manuscript Accepted: June 6, 2013
Published: August 15, 2013

Virtual Issues
August 16, 2013 Spotlight on Optics

Citation
Justin L. Neill, Brent J. Harris, Amanda L. Steber, Kevin O. Douglass, David F. Plusquellic, and Brooks H. Pate, "Segmented chirped-pulse Fourier transform submillimeter spectroscopy for broadband gas analysis," Opt. Express 21, 19743-19749 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-17-19743


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