Erbium-activated monolithic silica xerogels and silica-titania planar waveguides: optical and spectroscopic characterization

Luca Zampedri; Cristiana Tosello; Flavio Rossi; Sabina Ronchin; Raffaella Rolli; Maurizio Montagna; Alessandro Chiasera; Giancarlo C. Righini; Stefano Pelli; Andre Monteil; Stephane Chaussedent; Christope Bernard; Claire Duverger; Maurizio Ferrari; Cristina Armellini

doi:10.1117/12.424777

27 April 2001 Erbium-activated monolithic silica xerogels and silica-titania planar waveguides: optical and spectroscopic characterization

Luca Zampedri, Cristiana Tosello, Flavio Rossi, Sabina Ronchin, Raffaella Rolli, Maurizio Montagna, Alessandro Chiasera, Giancarlo C. Righini, Stefano Pelli, Andre Monteil, Stephane Chaussedent, Christope Bernard, Claire Duverger, Maurizio Ferrari, Cristina Armellini

Author Affiliations +

Proceedings Volume 4282, Rare-Earth-Doped Materials and Devices V; (2001) https://doi.org/10.1117/12.424777
Event: Symposium on Integrated Optics, 2001, San Jose, CA, United States

Abstract

Recent results obtained for Er₂O₃-SiO₂ monolithic xerogels and erbium activated SiO₂-TiO₂ planar waveguides are presented. Monolithic erbium-activated silica xerogels with erbium content ranging from 0 up to 40000 ppm were prepared by the sol-gel technique. Samples were densified by thermal treatment in air at 950 degrees C for 120 hours. The densification degree and the relative content of hydroxyl groups were studied by NIR absorption and Raman spectroscopies. Emission at 1.5 micrometers , characteristic of the ⁴I_13/2 yields ⁴I_15/2 transition of Er³⁺ ions, was observed at room temperature for all monolithic samples upon continuous wave excitation at 980 nm. For the 5000 Er/Si ppm doped xerogel, an intense photoluminescence was observed with a lifetime of 8 ms for the metastable ⁴I_13/2 level. Passive and erbium-activated SiO₂-TiO₂ planar waveguides, monomode at 632.8 nm, were prepared by a dip-coating technique. Some parameters such as H₂O content, intermediate and final thermal treatments, and the molar ratio TiO₂/SiO₂ were modified during the preparation of the solution in order to minimize the final content of residual hydroxyl groups and the phase separation between silica and titania. Raman spectroscopy was used to check the structural properties of the waveguides. A lifetime of 7 ms was measured for the metastable ⁴I_13/2 level in a 93SiO₂-7TiO₂ planar waveguide activated by 10000 ppm Er/(Si + Ti). The best value of the attenuation coefficient was of 0.5 dB/cm at 632.8 nm.

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Luca Zampedri, Cristiana Tosello, Flavio Rossi, Sabina Ronchin, Raffaella Rolli, Maurizio Montagna, Alessandro Chiasera, Giancarlo C. Righini, Stefano Pelli, Andre Monteil, Stephane Chaussedent, Christope Bernard, Claire Duverger, Maurizio Ferrari, and Cristina Armellini "Erbium-activated monolithic silica xerogels and silica-titania planar waveguides: optical and spectroscopic characterization", Proc. SPIE 4282, Rare-Earth-Doped Materials and Devices V, (27 April 2001); https://doi.org/10.1117/12.424777

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