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Title: Charge-transfer state excitation as the main mechanism of the photodarkening process in ytterbium-doped aluminosilicate fibres

We have studied photodarkening in ytterbium-doped fibre preforms with an aluminosilicate glass core. Analysis of their absorption and luminescence spectra indicates the formation of stable Yb{sup 2+} ions in the glass network under IR laser pumping at a wavelength λ = 915 nm and under UV irradiation with an excimer laser (λ = 193 nm). We have performed comparative studies of the luminescence spectra of the preforms and crystals under excitation at a wavelength of 193 nm. The mechanism behind the formation of Yb{sup 2+} ions and aluminium – oxygen hole centres (Al-OHCs), common to ytterbium-doped YAG crystals and aluminosilicate glass, has been identified: photoinduced Yb{sup 3+} charge-transfer state excitation. (optical fibres)
Authors:
; ; ; ; ;  [1] ; ; ;  [2] ;  [3]
  1. Fiber Optics Research Center, Russian Academy of Sciences, Moscow (Russian Federation)
  2. G.G.Devyatykh Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences, Nizhnii Novgorod (Russian Federation)
  3. Open Joint-Stock Company M.F. Stel'makh Polyus Research Institute, Moscow (Russian Federation)
Publication Date:
OSTI Identifier:
22373322
Resource Type:
Journal Article
Resource Relation:
Journal Name: Quantum Electronics (Woodbury, N.Y.); Journal Volume: 44; Journal Issue: 12; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION; ALUMINIUM; ALUMINIUM SILICATES; CRYSTALS; DOPED MATERIALS; EXCIMER LASERS; EXCITATION; FAR INFRARED RADIATION; GLASS; LUMINESCENCE; OPTICAL FIBERS; OXYGEN; PUMPING; SPECTRA; YTTERBIUM; YTTERBIUM IONS