Difference frequency generation spectrometer for simultaneous multispecies detection

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.

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Copyright 2010 Optical Society of America. This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-18-26-27670. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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Author Weibring, Petter
Richter, Dirk
Walega, James
Rippe, Lars
Fried, Alan
Publisher UCAR/NCAR - Library
Publication Date 2010-12-20T00:00:00
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Topic Category geoscientificInformation
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Metadata Date 2023-08-18T18:52:06.045385
Metadata Record Identifier edu.ucar.opensky::articles:10683
Metadata Language eng; USA
Suggested Citation Weibring, Petter, Richter, Dirk, Walega, James, Rippe, Lars, Fried, Alan. (2010). Difference frequency generation spectrometer for simultaneous multispecies detection. UCAR/NCAR - Library. http://n2t.net/ark:/85065/d7m045zv. Accessed 25 March 2025.

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