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Conception d'un amplificateur optique a 1.3 um: spectroscopie de couches minces de LaF3 dope Nd3+ et developpement de procedes technologiques innovants

Abstract : Neodymium ion is a potential candidate to realize an optical amplifier for the second optical telecommunications window, in parts owing to its strong absorption band accessible by commercial power laser diodes. Yet, 1.3 mm emission competes with the 1.06 mm transition emitted from the same metastable energy level and in order to increase performances of neodymium doped optical amplifiers this 1.06 mm emission has to be eliminated. Therefore, we propose a structure including a filter based on a tilted Bragg grating distributed on the whole length of the amplifier. The design of this amplifier is based on a thin layer of lanthanum trifluoride (LaF3) doped with neodymium (Nd3+). A spectroscopic study of Nd3+:LaF3 has been carried out. The aim of this study is to analyse some parameters having an influence upon the amplifier performances, particularly the polarisation of 1.03 mm emission and the effect of Nd3+ concentration. Thereafter a fabrication process has been developed. This process is inventive by many points: first by the association of a polymeric material to realise passive optical functions and monocrystalline Nd3+:LaF3 as an active material, and secondly by the development of generic technologies for the low cost fabrication of optical functions such as nanoimprint lithography using very low viscosity thermocurable polymers and poli-dicing. Surface treatments improving the adhesion on polymers and ionic crystals have also been developed. Finally, the gain of a micro-amplifier at 1.3 mm has been modelled and conditions to obtain a high gain and a good efficiency have been defined. After this modelling, a structure is proposed to realise the amplifier.
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Submitted on : Friday, May 27, 2005 - 11:14:06 AM
Last modification on : Friday, January 10, 2020 - 9:08:09 PM
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  • HAL Id : tel-00009326, version 1

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Benoit Viallet. Conception d'un amplificateur optique a 1.3 um: spectroscopie de couches minces de LaF3 dope Nd3+ et developpement de procedes technologiques innovants. Micro et nanotechnologies/Microélectronique. Université Paul Sabatier - Toulouse III, 2004. Français. ⟨tel-00009326⟩

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