Abstract
The detection sensitivity of noise-immune cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) is often limited by background signals that bring in drifts. A novel realization of NICE-OHMS, termed differential NICE-OHMS, that both reduces such drifts and enlarges the molecular signal is presented. It is based on simultaneous detection of NICE-OHMS signals in reflection and transmission, followed by a subtraction of the former (properly weighted) from the latter. An Allan plot analysis shows that the instrumentation could demonstrate a noise equivalent absorption per unit length (NEAL) of 4.7 × 10−14 cm−1, obtained for an integration time of 170 s.
| Original language | English |
|---|---|
| Pages (from-to) | 29454-29471 |
| Number of pages | 18 |
| Journal | Optics Express |
| Volume | 25 |
| Issue number | 23 |
| DOIs | |
| Publication status | Published - 13 Nov 2017 |
| MoE publication type | A1 Journal article-refereed |
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Zhao, G., Hausmaninger, T., Ma, W., & Axner, O. (2017). Differential noise-immune cavity-enhanced optical heterodyne molecular spectroscopy for improvement of the detection sensitivity by reduction of drifts from background signals. Optics Express, 25(23), 29454-29471. https://doi.org/10.1364/OE.25.029454