Light-induced thermo-elastic effect in quartz tuning forks exploited as a photodetector in gas absorption spectroscopy

Optics Express
Stefano Dello RussoVincenzo Spagnolo

Abstract

We report on a study of light-induced thermo-elastic effects occurring in quartz tuning forks (QTFs) when exploited as near-infrared light detectors in a tunable diode laser absorption spectroscopy sensor setup. Our analysis showed that when the residual laser beam transmitted by the absorption cell is focused on the QTF surface area where the maximum strain field occurs, the QTF signal-to-noise ratio (SNR) is proportional to the strain itself and to the QTF accumulation time. The SNR was also evaluated when the pressure surrounding the QTF was lowered from 700 Torr to 5 Torr, resulting in an enhancement factor of ∽4 at the lowest pressure. At 5 torr, the QTF employed as light detector showed an SNR ∽6.5 times higher than that obtained by using a commercially available amplified photodetector.

References

Aug 6, 2009·Optics Express·Ulrike WillerDavid A Ritchie
Apr 14, 2016·Annual Review of Analytical Chemistry·Julian Haas, Boris Mizaikoff
Aug 9, 2017·Optics Express·Ramin Ghorbani, Florian M Schmidt
Jan 31, 2019·Optics Express·Pietro PatimiscoVincenzo Spagnolo
Apr 3, 2020·Optics Letters·Lien HuFrank K Tittel

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