Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 38, Issue 7, Pages 2067-2072Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2019.2960804
Keywords
Gas sensor; hollow core fiber; mid-infrared absorption spectroscopy; microstructured optical fiber; optical fiber sensor
Funding
- General Research Fund from the University Grants Committee of the Hong Kong SAR, China [14206317]
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Ultrasensitive mid-infrared absorption spectroscopy is demonstrated by the use of a novel silica-based hollow-core negative curvature fiber (HC-NCF). The HC-NCF used in this article consists of a single ring of six nontouching cladding capillaries around the hollow core, thus forming a unique core boundary with a negative curvature. Such a silica HC-NCF enables the broadband single-mode transmission in the mid-infrared. By using the HC-NCF as a compact gas cell, a proof-of-principle experiment is conducted to detect the N2O line at 2778.37 cm(-1) with a distributed-feedback interband cascade laser emitting at 3.6 mu m. A minimum detectable absorbance of 3 x 10(-5) is achieved for a fiber length of 120 cm, corresponding to a noise equivalent absorption (NEA) coefficient of 2.5 x 10(-7) cm(-1). Silica HC-NCFs offer a new opportunity of developing sensitive and compact gas sensors using mid-infrared absorption spectroscopy.
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