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Synthèses et caractérisations structurales d'iodates métalliques, matériaux lasers convertisseurs de fréquences

Abstract : The materials likely to cover the technologic needs in the field infrared laser emission for applications between 3 µm and 12 µm, including the three windows transparency of the atmosphere are few. The iodates metallic compounds appear to be potential material. Indeed it was shown that the compounds are the following common characteristics: good thermal stability, non-hygroscopicity, window of transparency on powder which extends from the visible to the beginning of the far infrared (12 µm), optical threshold damage on powder equal to some GW.cm-2. The work presented in this thesis focuses on the synthesis and structural determination of new asymmetrical iodates compounds doped with luminescent rare earth ions or transition metal to obtain difunctional materials that can be both luminescent to generate the laser light source and to convert non-linear frequency of original issue. The asymmetrical matrix AgGd(IO3)4 has been doped with Nd3+ and Yb3+ ions, with luminescence life time of the same magnitude as that of some commercial lasers. The studies on iodate lanthanum allowed characterization of La(IO3)3(HIO3) and La(IO3)3(HIO3)1,33 obtained by slow crystallization in an nitric acid solution, while the α-La(IO3)3 anhydrous compound is obtained by hydrothermal synthesis. This is a potential candidate as an laser matrix by the insertion of lanthanide ions.
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https://tel.archives-ouvertes.fr/tel-00335252
Contributor : Mohamed Benabdallah Taouti <>
Submitted on : Thursday, October 30, 2008 - 12:03:13 AM
Last modification on : Thursday, November 19, 2020 - 1:00:54 PM
Long-term archiving on: : Monday, June 7, 2010 - 10:28:21 PM

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Mohamed Benabdallah Taouti. Synthèses et caractérisations structurales d'iodates métalliques, matériaux lasers convertisseurs de fréquences. Physique Atomique [physics.atom-ph]. Université Joseph-Fourier - Grenoble I, 2008. Français. ⟨tel-00335252⟩

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