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

被引：14

作者：

Zampedri, L ^{[1
]}

Tosello, C ^{[1
]}

Rossi, F ^{[1
]}

Ronchin, S ^{[1
]}

Rolli, R ^{[1
]}

Montagna, M ^{[1
]}

Chiasera, A ^{[1
]}

Righini, GC ^{[1
]}

Pelli, S ^{[1
]}

Monteil, A ^{[1
]}

Chaussedent, S ^{[1
]}

Bernard, C ^{[1
]}

Duverger, C ^{[1
]}

Ferrari, M ^{[1
]}

Armellini, C ^{[1
]}

机构：

[1] Univ Trent, Dipartimento Fis, I-38050 Trent, Italy

来源：

RARE-EARTH-DOPED MATERIALS AND DEVICES V | 2001年 / 4282卷

关键词：

erbium; sol-gel; silica-titania; planar waveguides;

D O I：

10.1117/12.424777

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 degreesC 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 mum, characteristic of the I-4(13/2) --> I-4(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 I-4(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 I-4(13/2) level in a 93SiO(2)-7TiO(2) planar waveguide activated by 10 000 ppm Er/(Si+Ti). The best value of the attenuation coefficient was of 0.5 dB/cm at 632.8 nm.

引用

页码：200 / 209

页数：10

共 30 条

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