Swept-wavelength mid-infrared fiber laser for real-time ammonia gas sensing

R. I. Woodward, M. R. Majewski, D. D. Hudson, S. D. Jackson

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Abstract

The mid-infrared (mid-IR) spectral region holds great promise for new laser-based sensing technologies, based on measuring strong mid-IR molecular absorption features. Practical applications have been limited to date, however, by current low-brightness broadband mid-IR light sources and slow acquisition-time detection systems. Here, we report a new approach by developing a swept-wavelength mid-infrared fiber laser, exploiting the broad emission of dysprosium, and using an acousto-optic tunable filter to achieve electronically controlled swept-wavelength operation from 2.89 to 3.25 μm (3070-3460 cm-1 ). Ammonia (NH3) absorption spectroscopy is demonstrated using this swept source with a simple room-temperature single-pixel detector, with 0.3 nm resolution and 40 ms acquisition time. This creates new opportunities for real-time high-sensitivity remote sensing using simple, compact mid-IR fiber-based technologies.

Original languageEnglish
Article number020801
Pages (from-to)1-7
Number of pages7
JournalAPL photonics
Volume4
Issue number2
DOIs
Publication statusPublished - Feb 2019

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Copyright the Author(s) 2019. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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