All-fiber hydrogen sensor based on stimulated Raman gain spectroscopy with a 1550 nm hollow-core fiber

TL;DR

This paper presents a highly sensitive, all-fiber hydrogen sensor utilizing stimulated Raman gain spectroscopy in a hollow-core fiber at 1550 nm, achieving detection limits as low as 17 ppm for trace hydrogen analysis.

Contribution

It introduces a novel all-fiber sensor design based on stimulated Raman gain spectroscopy in a hollow-core fiber, operating in the telecommunication band for cost-effective trace hydrogen detection.

Findings

Detection limit of 17 ppm for hydrogen

Operates at 1550 nm in telecommunication band

Potential for high sensitivity and resolution

Abstract

We report a highly sensitive all-fiber hydrogen sensor based on continuous-wave stimulated Raman gain spectroscopy with a hollow-core photonic crystal fiber operating around 1550 nm. A pump-probe configuration is used, in which the frequency difference between the pump and the probe lasers is tuned to the S0(0) transition of para-hydrogen with a Raman shift of 354 cm-1. Preliminary experiments demonstrate a detection limit down to 17 ppm with a 250 s averaging time, and further improvement is possible. The all-fiber configuration operating in the telecommunication wavelength band would enable cost-effective and compact sensors for high sensitivity and high-resolution trace analysis.