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A broadband Tm/Ho-doped fiber laser tunable from 1.8 to 2.09 µm for intracavity absorption spectroscopy

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Abstract

A broadband tunable Tm/Ho-doped fiber laser is developed for sensitive in situ measurements of intracavity absorption spectra in the spectral range of 4780–5560 cm−1. This spectral range includes an atmospheric transmission window enabling sensitive measurements of various species. The spectral bandwidth of laser emission varies from 20 to 60 cm−1 and is well suitable for multicomponent spectroscopy. The sensitivity achieved in cw operation corresponds to an effective absorption path length of Leff = 20 km, with a spectral noise of less than 1%. The spectroscopic system is applied for measurements of absorption spectra of H2O, NH3 and for simultaneous in situ detection of three isotopes of CO2 in human breath, which is important for medical diagnostics procedures.

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Authors and Affiliations

  1. Institute for Combustion and Gas Dynamics-Reactive Fluids, University of Duisburg-Essen, Duisburg, Germany

    Peter Fjodorow

  2. Institute of Laser Physics, University of Hamburg, Hamburg, Germany

    Ortwin Hellmig & Valery M. Baev

Authors
  1. Peter Fjodorow
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  2. Ortwin Hellmig
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  3. Valery M. Baev
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Correspondence to Peter Fjodorow.

Additional information

This article is part of the topical collection “Mid-infrared and THz Laser Sources and Applications” guest edited by Wei Ren, Paolo De Natale and Gerard Wysocki.

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Fjodorow, P., Hellmig, O. & Baev, V.M. A broadband Tm/Ho-doped fiber laser tunable from 1.8 to 2.09 µm for intracavity absorption spectroscopy. Appl. Phys. B 124, 62 (2018). https://doi.org/10.1007/s00340-018-6932-y

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