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Cavity-enhanced cantilever-enhanced photo-acoustic spectroscopy

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Original languageEnglish
Pages (from-to)2291-2296
Number of pages6
Publication statusPublished - 28 Feb 2019
Publication typeA1 Journal article-refereed


We have improved the sensitivity of a state-of-the-art cantilever-enhanced photo-acoustic trace gas sensor by combining it with an optical power build-up cavity. The build-up cavity enhances the photo-acoustic signal by a factor of ∼100, resulting in an exceptionally good normalised noise equivalent absorption (NNEA) value of 1.75 × 10−12 W cm−1 Hz−1/2. We demonstrate the sensor platform in the 1530 nm wavelength range with a simple distributed feedback diode laser, achieving 75 ppt sensitivity for C2H2 with a 10 s integration time.

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Field of science, Statistics Finland