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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 26 — Dec. 20, 2010
  • pp: 27670–27681

Difference frequency generation spectrometer for simultaneous multispecies detection

Petter Weibring, Dirk Richter, J. G. Walega, Lars Rippe, and Alan Fried  »View Author Affiliations

Optics Express, Vol. 18, Issue 26, pp. 27670-27681 (2010)

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A difference-frequency generation based spectrometer system for simultaneous ultra-sensitive measurements of formaldehyde (CH2O) and Methane (CH4) is presented. A new multiplexing approach using collinear quasi-phase-matching in a single grating period of periodically poled lithium niobate (PPLN) is discussed and demonstrated for two pairs of pump and signal lasers to generate mid-infrared frequencies at 2831.64 cm−1 and 2916.32 cm−1, respectively. The corresponding absorption signals are discriminated by modulating the DFB diode lasers at modulation frequencies of 40 kHz and 50 kHz, respectively, and using a computer based modulation and de-modulation scheme. In addition, simultaneous measurements of CH2O, CH4 and H2O are demonstrated utilizing both collinear and non-collinear quasi-phase-matching.

© 2010 OSA

OCIS Codes
(010.1120) Atmospheric and oceanic optics : Air pollution monitoring
(060.2390) Fiber optics and optical communications : Fiber optics, infrared
(190.0190) Nonlinear optics : Nonlinear optics
(190.2620) Nonlinear optics : Harmonic generation and mixing
(300.6260) Spectroscopy : Spectroscopy, diode lasers

ToC Category:

Original Manuscript: October 20, 2010
Revised Manuscript: November 26, 2010
Manuscript Accepted: November 26, 2010
Published: December 16, 2010

Petter Weibring, Dirk Richter, J. G. Walega, Lars Rippe, and Alan Fried, "Difference frequency generation spectrometer for simultaneous multispecies detection," Opt. Express 18, 27670-27681 (2010)

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