Demonstration of mid-infrared gas sensing using an anti-resonant hollow core fiber and a quantum cascade laser

Nikodem M., Gomółka G., Klimczak M., Pysz D. and Buczyński R.

Optics Express

27(25), 2019, 36350-36357, 10.1364/OE.27.036350

In this paper we report a mid-infrared sensor based on an anti-resonant hollow core fiber. A quantum cascade laser operating around 4.53 µm is used to target one of the strongest transition of nitrous oxide near 2203.7 cm−1. The system provides 1-second minimum detection limit at single parts-per-billion level using 3.2-m-long fiber with the response time of less than 30 seconds. Presented sensing approach shows a good perspective for compact and sensitive mid-infrared fiber-based spectrometers.