Cavity-enhanced cantilever-enhanced photo-acoustic spectroscopy
Research output: Contribution to journal › Article › Scientific › peer-review
|Number of pages||6|
|Publication status||Published - 28 Feb 2019|
|Publication type||A1 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.