Highly sensitive and rugged gas optical detection via interferometric cavity-assisted photothermal spectroscopy

Davide Pinto; J. P. Waclawek; Stefan Lindner; Harald Moser; Giovanna Ricchiuti; Bernhard Lendl

doi:10.1117/12.2648273

8 March 2023 Highly sensitive and rugged gas optical detection via interferometric cavity-assisted photothermal spectroscopy

Davide Pinto, J. P. Waclawek, Stefan Lindner, Harald Moser, Giovanna Ricchiuti, Bernhard Lendl

Author Affiliations +

Proceedings Volume 12428, Photonic Instrumentation Engineering X; 124280L (2023) https://doi.org/10.1117/12.2648273
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

We report on the detection of nitric oxide using an Interferometric Cavity-Assisted Photothermal Spectroscopy (ICAPS) gas sensor in combination with a DFB-QCL emitting at 1900 cm^-1 as excitation source. In ICAPS, a probe laser is coupled to a Fabry-Perot interferometer acting as an optical transducer of thermal effects. A wavelength modulation approach of the probe diode laser was employed, to actively lock its wavelength to the point of highest sensitivity and linearity of the interferometric fringe for a stable readout. A normalized noise equivalent absorption of 5·10-6 Wcm-1Hz-1/2 was achieved corresponding to 1.4 ppm of NO.

Conference Presentation

Citation Download Citation

Davide Pinto, J. P. Waclawek, Stefan Lindner, Harald Moser, Giovanna Ricchiuti, and Bernhard Lendl "Highly sensitive and rugged gas optical detection via interferometric cavity-assisted photothermal spectroscopy", Proc. SPIE 12428, Photonic Instrumentation Engineering X, 124280L (8 March 2023); https://doi.org/10.1117/12.2648273

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