Heterodyne interferometric signal retrieval in photoacoustic spectroscopy

Karol Krzempek, Grzegorz Dudzik, Krzysztof Abramski, Gerard Wysocki, Piotr Jaworski, Michał Nikodem

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


A new heterodyne interferometric method for optical signal detection in photoacoustic or photothermal spectroscopy is demonstrated and characterized. It relies on using one laser beam for the photoacoustic excitation of the gas sample that creates refractive index changes along the beam path, while another laser beam is used to measure these changes. A heterodyne-based detection of path-length changes is presented that does not require the interferometer to be balanced or stabilized, which significantly simplifies the optical design. We discuss advantages of this new approach to photoacoustic signal detection and the new sensing arrangements that it enables. An open-path photoacoustic spectroscopy of carbon dioxide at 2003 nm and a novel sensing configuration that enables three-dimensional spatial gas distribution measurement are experimentally demonstrated.

Original languageEnglish (US)
Pages (from-to)1125-1132
Number of pages8
JournalOptics Express
Issue number2
StatePublished - Jan 22 2018

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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