Enhanced diffusion of molecular hydrogen in germanosilicate fibres loaded with hydrogen at high pressures

Journal Article · Thu Mar 31 00:00:00 EST 2005 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE2005V035N03ABEH002890· OSTI ID:21470720

Vasil'ev, Sergei A; Koltashev, V V; Sokolov, V O; Medvedkov, O I; Rybaltovsky, A A; Plotnichenko, V G; Dianov, Evgenii M ^[1]; Rybaltovskii, A O ^[2]; Klyamkin, Semen N ^[3]; Malosiev, A R ^[4]

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

Absorption spectra and spontaneous Raman spectra of optical fibres with a germanosilicate core loaded with molecular hydrogen at a pressure of 150-170 MPa are studied; the variation of these spectra during the outdiffusion of hydrogen from the fibres is also investigated. The purely rotational transitions of molecular hydrogen in Raman spectra of optical fibres are recorded for the first time. The changes in the spectral parameters of fibre Bragg gratings loaded with hydrogen are analysed. It is observed for the first time that under such high loading pressures, the decrease in the hydrogen concentration in the fibre core after completion of hydrogen loading occurs in two clearly manifested stages, the initial stage being characterised by a more rapid outlet of hydrogen as compared to the dynamics of hydrogen outdiffusing at pressures of 10-15 MPa. Barodiffusion of molecular hydrogen in optical fibres is considered as the main mechanism explaining this effect. An increase in the solubility of molecular hydrogen in germanosilicate fibres exposed to UV radiation is observed for the first time. (optical fibres)

• OSTI ID: 21470720
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Vol. 35, Issue 3; Other Information: DOI: 10.1070/QE2005v035n03ABEH002890; ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTRA
DIFFUSION
GERMANIUM SILICATES
GRATINGS
HYDROGEN
OPTICAL FIBERS
PRESSURE RANGE MEGA PA 10-100
RAMAN SPECTRA
SOLUBILITY
ULTRAVIOLET RADIATION
VARIATIONS
ELECTROMAGNETIC RADIATION
ELEMENTS
FIBERS
GERMANIUM COMPOUNDS
NONMETALS
OXYGEN COMPOUNDS
PRESSURE RANGE
PRESSURE RANGE MEGA PA
RADIATIONS
SILICATES
SILICON COMPOUNDS
SPECTRA