Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Mid-infrared fiber-optic photothermal interferometry

Not Accessible

Your library or personal account may give you access

Abstract

We demonstrate mid-infrared photothermal interferometry (PTI) in a hollow-core fiber (HCF) for trace gas detection. Compared with free-space PTI, the optical intensity could be increased by orders of magnitude by confining the pump and probe lights in the hollow core. We coupled the pump light at 4.46 μm from a quantum cascade laser and the 1555.14 nm probe light into the HCF with a bore size of 200 μm. The HCF was filled with nitrous oxide (N2O) which has strong absorption at the pump wavelength. The probe light detects the N2O absorption-induced phase change in the HCF via a fiber-optic Mach–Zehnder interferometer. With a 25 cm fiber length and 6 mW of pump power, we have achieved a minimum detection limit of 0.8 ppm for N2O, corresponding to a normalized noise equivalent absorption coefficient of 4.9×107cm1WHz1/2.

© 2017 Optical Society of America

Full Article  |  PDF Article
More Like This
Pump–probe-alternating photothermal interferometry for two-component gas sensing

Linhao Guo, Pengcheng Zhao, Hoi Lut Ho, Shoulin Jiang, Haihong Bao, Shoufei Gao, Yingying Wang, and Wei Jin
Opt. Lett. 48(24) 6440-6443 (2023)

Gas sensing with mode-phase-difference photothermal spectroscopy assisted by a long period grating in a dual-mode negative-curvature hollow-core optical fiber

Pengcheng Zhao, Hoi Lut Ho, Wei Jin, Shangchun Fan, Shoufei Gao, Yingying Wang, and Pu Wang
Opt. Lett. 45(20) 5660-5663 (2020)

Performance optimization of hollow-core fiber photothermal gas sensors

Yuechuan Lin, Wei Jin, Fan Yang, Yanzhen Tan, and Hoi Lut Ho
Opt. Lett. 42(22) 4712-4715 (2017)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (4)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (3)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved