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Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten. A dual-comb spectrometer for trace gas analysis in the mid-infrared
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Volltext urn:nbn:de:0011-n-6333226 (1.2 MByte PDF) MD5 Fingerprint: a5f79e7da6836b2a53d16acd43e5c0fb Copyright Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. Erstellt am: 16.4.2021 |
| Schunemann, Peter G. (Hrsg.) ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Nonlinear Frequency Generation and Conversion: Materials and Devices XX : 6-12 March 2021, Online Only, California, United States
Bellingham, WA: SPIE, 2021 (Proceedings of SPIE 11670)
Paper 1167005, 6 S. |
| Conference "Nonlinear Frequency Generation and Conversion - Materials and Devices" <20, 2021, Online> |
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| Englisch |
| Konferenzbeitrag, Elektronische Publikation |
| Fraunhofer IPM () |
| frequency comb; spectrometer; trace gas |
Abstract
A dual frequency comb spectrometer is realized by electro-optic modulation of a 1550 nm laser and subsequent conversion to the mid-infrared by difference-frequency generation (DFG). Using an optical parametric oscillator for the DFG the combs can be tuned from 3 μm to 4.7 μm with 440 comb modes covering 220 GHz (< 6 cm-1). Trace gas detection of nitrous oxide, carbon dioxide and methane is demonstrated with a 7.2-m-multi-pass cell while a sufficiently low noise-equivalent absorbance is reached in already 1 s. The bandwidth normalized noise-equivalent-absorption coefficient is consistently below 2.8 × 10-6 Hz-1/2 cm-1 while the precision of the determined concentrations is better 2 % Hz-1/2.