Photoacoustic detection of CO2 using a H2-filled mid-infrared fiber Raman laser source

Yazhou Wang*, Manoj K. Dasa, J. E. Antonio-Lopez, Rodrigo Amezcua Correa, Christos Markos

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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Abstract

Unraveling the scientific and technological importance of the mid-infrared (mid-IR) region remains yet a long-standing challenge. Despite the significant efforts on mid-IR light sources, development of high-energy, narrow-linewidth and compact lasers still constitutes the main obstacle towards novel spectroscopic, imaging and sensing devices. Photoacoustic modality is known as one of the most powerful tools enabling high signal-to-noise ratio gas detection and albeit its wide use in the mature near-infrared (near-IR) region, further research has to be carried out in the mid-IR in order to “unlock” its full potential. In this work, we aim on tracing CO2 based on the innovative combination of the emerging gas-filled mid-IR silica anti-resonant hollow-core fiber (ARHCF) Raman laser technology with the powerful photoacoustic modality. The laser source adopts the stimulated Raman scattering effect of H2 filled in a piece of ARHCF, to enable the generation of first-order vibrational Raman Stokes from a 1533 nm Er-doped fiber laser pump. With this configuration, a nanosecond laser pulses with micro-joule level pulse energy is achieved at ~ 4.25 μm wavelength, which is located within the strongest absorption band of CO2. The laser’s linewidth is estimated to be tens GHz level. This laser source is used to drive an in-house developed photoacoustic sensor, revealing a 1.78 ppm level CO2 detection limit in laboratory condition. This work provides a valuable reference for the development of high-sensitivity gas detectors.

Original languageEnglish
Title of host publicationProceedings of Photons Plus Ultrasound
EditorsAlexander A. Oraevsky, Lihong V. Wang
PublisherSPIE - International Society for Optical Engineering
Publication date2023
Article number123790L
ISBN (Electronic)9781510658639
DOIs
Publication statusPublished - 2023
EventPhotons Plus Ultrasound: Imaging and Sensing 2023 - San Francisco, United States
Duration: 29 Jan 20231 Feb 2023

Conference

ConferencePhotons Plus Ultrasound: Imaging and Sensing 2023
Country/TerritoryUnited States
CitySan Francisco
Period29/01/202301/02/2023
SeriesProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume12379
ISSN1605-7422

Keywords

  • CO2 detection
  • Gas-filled fiber Raman laser
  • Mid-infrared laser
  • Photoacoustic detection

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