3.4 mu m to 660 nm wavelength conversion using Er3+ doped materials

Abstract : The 2-15 mu m spectral range hosts many optical sensing applications from biology to environmental monitoring, and infrared spectroscopy is a simple and reliable way to provide fast and in-situ analysis method. Rare-earth ion emissions within chalcogenide glasses with low phonon energies proved to be efficient to address mid-IR luminescence based sensing applications. In particular, they give promising results for the development of all-optical gas sensors in the 3 to 5 mu m spectral range based on IR conversion into visible light using rare earth excited state absorption mechanisms. In this article, we report the wavelength conversion of 3.4 mu m radiation into 660 nm in Er3+ KPb2Cl5 bulk crystal, Er3+ Ga5Ge20Sb10S65 and Er3+ Ga5Ge20Sb5S70 glasses using an excited state absorption process. This wavelength conversion is the result of the excitation of Er3+ ions following the excited state absorption of IR photons and the Er3+ ions subsequent spontaneous emission in the visible domain. Using an 808 nm pumping, a 3.4 mu m photon excited state absorption gives rise to a 660 nm emission. This wavelength conversion device can be further implemented for methane all-optical sensing at 3.4 mu m, for the development of remote "all-optical" methane mid-IR sensors with only visible and near-IR input and output signals. This "all-optical concept" enables the use of silica fibers over large distances, thus considerably increasing the scope of possible applications.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01974851
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Submitted on : Wednesday, January 9, 2019 - 9:05:50 AM
Last modification on : Thursday, October 17, 2019 - 4:47:38 PM

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I. Hafienne, F. Starecki, G. Louvet, A. Braud, J-L. Doualan, et al.. 3.4 mu m to 660 nm wavelength conversion using Er3+ doped materials. Conference on Fiber Lasers and Glass Photonics - Materials through Applications, Apr 2018, Strasbourg, France. ⟨10.1117/12.2314457⟩. ⟨hal-01974851⟩

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