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Ingénierie cristalline pour l'optique non linéaire quadratique : iodates métalliques.

Abstract : Nowadays, most of quadratic NLO commercial materials are used for applications in the field of UV to the near infrared. However, the atmosphere presents two others windows of transparency in the infrared: window II between 3 and 5 Μm and window III between 8 and 12 Μm. The materials which can be used for applications between 4 Μm and 12 Μm are very few. Anhydrous iodate compounds studied in this work of general formula M(IO3)n or MM'(IO3)4 were synthesised either by slow evaporation in concentrated nitric acid or in hydrothermal synthesis. Structural analyses carried out by X-ray diffraction on powder and on single crystal, underline an analogy between M(IO3)2, M(IO3)3 and a-LiIO3 compounds which allows us to synthesise solid solutions. The compounds studied present three important common characteristics: great thermal stability on average 500°C, non hygroscopicity and a very large window of transparency which extends continuously from UV, for colourless compounds, towards the far infrared on average up to 13 Μm. They also have an optical damage threshold equal to some GW.cm-2 on powder and an intensity of second harmonic generation signal similar or even higher than the one observed for a-LiIO3. Moreover, the insertion of luminescent elements could be done in several iodate matrices. We now have a whole family of potentially active materials (laser emission caused by luminescent elements for lasers with wavelengths fixed or tunable) and/or passive materials (frequency doubling) which could respond to the requirements for concerned applications.
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https://tel.archives-ouvertes.fr/tel-00263415
Contributor : Delphine Phanon <>
Submitted on : Wednesday, March 12, 2008 - 9:44:26 AM
Last modification on : Friday, December 18, 2020 - 1:34:02 PM
Long-term archiving on: : Thursday, May 20, 2010 - 9:57:50 PM

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Delphine Phanon. Ingénierie cristalline pour l'optique non linéaire quadratique : iodates métalliques.. Matériaux. Université Joseph-Fourier - Grenoble I, 2006. Français. ⟨tel-00263415⟩

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