EGU21-12235
https://doi.org/10.5194/egusphere-egu21-12235
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Precision Mid-Infrared Frequency Comb Spectroscopy using a Cross-Dispersed Spectrometer

D. Michelle Bailey, Gang Zhao, and Adam J. Fleisher
D. Michelle Bailey et al.
  • National Institute of Standards and Technology, Gaithersburg, United States of America (michelle.bailey@nist.gov)

Advances in optical technology have led to the commercialization and widespread use of broadband optical frequency combs for multiplexed measurements of trace-gas species. Increasingly available in the mid-infrared spectral region, these devices can be leveraged to interrogate the molecular fingerprint region where many fundamental rovibrational transitions occur. Here we present a cross-dispersed spectrometer employing a virtually imaged phased array etalon and ruled diffraction grating coupled with a difference frequency generation comb centered near 4.5 µm. The spectrometer achieves sub-GHz spectral resolution with a 30 cm-1 instantaneous bandwidth. Laboratory results for nitrous oxide isotopic abundance retrieval will be presented. Challenges relating to characterizing the instrument lineshape function, constructing a frequency axis traceable to the comb, and accurate spectral modelling will be addressed and progress towards incorporating a more compact laser frequency comb source into the system will be discussed.

How to cite: Bailey, D. M., Zhao, G., and Fleisher, A. J.: Precision Mid-Infrared Frequency Comb Spectroscopy using a Cross-Dispersed Spectrometer, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-12235, https://doi.org/10.5194/egusphere-egu21-12235, 2021.

Corresponding presentation materials formerly uploaded have been withdrawn.