Photoinduced and thermal reactions involving hydrogen in high-germania-core optical fibres

Journal Article · Wed Dec 31 00:00:00 EST 2008 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE2008V038N12ABEH013819· OSTI ID:21466520

Rybaltovskii, A O ^[1]; Koltashev, V V; Medvedkov, O I; Rybaltovsky, A A; Sokolov, V O; Plotnichenko, V G; Dianov, Evgenii M ^[2]; Klyamkin, Semen N ^[3]

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1. Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow (Russian Federation)
2. Fiber Optics Research Center, Russian Academy of Sciences, Moscow (Russian Federation)
3. Department of Chemistry, M.V. Lomonosov Moscow State University, Moscow (Russian Federation)

We report a Raman scattering study of photoinduced and thermal reactions between H{sub 2} and germanosilicate optical fibres with 22 mol % and 97 mol % GeO{sub 2} in the core (F1 and F2, respectively) after H{sub 2} loading at 150 MPa (1500 atm). The mechanisms of photoreactions are investigated in a wide range of incident laser wavelengths (244, 333, 354, 361 and 514 nm). Thermal reactions are studied at 500 {sup 0}C. The results indicate that the main mechanism behind the formation of hydrogen-containing defects with Raman bands at 700, 750, 2190, 3600 and 3680 cm{sup -1} involves {identical_to}Ge-O-Ge{identical_to} or {identical_to}Ge-O-Si{identical_to} bond breaking and formation of hydride and hydroxyl species: =GeH{sub 2} (700, 750 cm{sup -1}), {identical_to}Ge-H (2190 cm{sup -1}), {identical_to}GeO-H (3600 cm{sup -1}) and {identical_to}SiO-H (3680 cm{sup -1}). The key features of the reactions in the F1 and F2 fibres are analysed. In particular, photoinduced reactions give {identical_to}Si-OH groups only in the F1 fibres, whereas the formation of germanium nanoclusters at a relatively low temperature ({approx}500 {sup 0}C) or {identical_to}GeO-H and {identical_to}Ge-H defects under 514-nm irradiation has only been observed in the F2 fibres. (optical fibres)

• OSTI ID: 21466520
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Vol. 38, Issue 12; Other Information: DOI: 10.1070/QE2008v038n12ABEH013819; ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DEFECTS
GERMANATES
GERMANIUM
GERMANIUM HYDRIDES
GERMANIUM OXIDES
HYDROGEN
HYDROXIDES
IRRADIATION
LASERS
NANOSTRUCTURES
OPTICAL FIBERS
PRESSURE RANGE MEGA PA
RAMAN EFFECT
TEMPERATURE RANGE 0065-0273 K
WAVELENGTHS
CHALCOGENIDES
ELEMENTS
FIBERS
GERMANIUM COMPOUNDS
HYDRIDES
HYDROGEN COMPOUNDS
METALS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PRESSURE RANGE
TEMPERATURE RANGE