Photothermal CO detection in a hollow-core negative curvature fiber

Chenyu Yao; Qiang Wang; Yuechuan Lin; Wei Jin; Limin Xiao; Shoufei Gao; Yingying Wang; Pu Wang; Wei Ren

doi:10.1364/OL.44.004048

Optics Letters
Vol. 44,
Issue 16,
pp. 4048-4051
(2019)
•https://doi.org/10.1364/OL.44.004048

Photothermal CO detection in a hollow-core negative curvature fiber

Chenyu Yao, Qiang Wang, Yuechuan Lin, Wei Jin, Limin Xiao, Shoufei Gao, Yingying Wang, Pu Wang, and Wei Ren

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Chenyu Yao, Qiang Wang, Yuechuan Lin, Wei Jin, Limin Xiao, Shoufei Gao, Yingying Wang, Pu Wang, and Wei Ren, "Photothermal CO detection in a hollow-core negative curvature fiber," Opt. Lett. 44, 4048-4051 (2019)

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- Optical Sensors, Measurements, and Metrology
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About this Article
History
- Original Manuscript: May 13, 2019
- Revised Manuscript: July 19, 2019
- Manuscript Accepted: July 19, 2019
- Published: August 13, 2019

Abstract

We demonstrate the first, to the best of our knowledge, photothermal carbon monoxide (CO) sensor using a hollow-core negative curvature fiber. The hollow-core fiber features a typical structure of one ring cladding containing eight nontouching capillaries to form a negative curvature core-surround. The photothermal effect in a 40-μm hollow core is induced by CO absorption at 2327 nm and detected by a Mach–Zehnder interferometer operating at 1533 nm. By using wavelength modulation spectroscopy, we achieve a normalized noise equivalent absorption coefficient of $4.4 \times 10^{- 8} {cm}^{- 1} W {Hz}^{- 1 / 2}$ . As CO has a very slow vibrational-translational relaxation process, we enhance the photothermal signal by enhancing the relaxation with the water vapor additive.

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Technique	Pump $λ$ [μm]	Pressure [bar]	NNEA [ ${cm}^{- 1} W {Hz}^{- 1 / 2}$ ]
PAS [18]	4.75	1	$2.8 \times 10^{- 7}$
QEPAS [19]	4.55	0.06	$5.3 \times 10^{- 7}$
QEPAS [20]	4.55	0.06	$7.4 \times 10^{- 8}$
QEPAS [21]	4.61	1	$1.6 \times 10^{- 8}$
EW-QEPAS [22]	2.327	1	$8.6 \times 10^{- 8}$
PTI (this work)	2.327	1	$4.4 \times 10^{- 8}$

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