Photodarkening in ytterbium-doped silica fibers
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منابع مشابه
Thermoluminescence characterization of traps involved in the photodarkening of ytterbium-doped silica fibers.
The photodarkening (PD) mechanisms of ytterbium-doped silica optical fibers have still not been elucidated, although hardening routes have been proposed. Most basic questions are still under debate about the assignment of the darkening excitation bands into the UV range, the nature of absorbing centers (photoionized centers or trapped carriers?), or of traps accepting photo-released carriers (e...
متن کاملImproved Setup and Procedure for Benchmarking of Photodarkening in Ytterbium Doped Silica Fibers
This paper presents a new setup and a corresponding procedure for the accurate measurement of photodarkening in ytterbium doped fibers. The core-pumping scheme enables the use of short samples and a low pump power and the automation of the measurement permits long-term tests for an effective benchmarking of fibers with low photo-degradation. Exploiting temperature-controlled components and cohe...
متن کاملCharacterization and Analysis of Photodarkening in Double Cladding Ytterbium-doped Silica Fibers
OF DOCTORAL DISSERTATION HELSINKI UNIVERSITY OF TECHNOLOGY P. O. BOX 1000, FI-02015 TKK http://www.tkk.fi Author Mikko Söderlund Name of the dissertation Manuscript submitted 25.9.2009 Manuscript revised 13.11.2009 Date of the defence 4.12.2009 Article dissertation (summary + original articles) Monograph Faculty Department Field of research Opponent(s) Supervisor Instructor Abstract
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Al-silicate fibers have excellent manufacturing quality. Unfortunately, high-Yb doping concentration may be limited by severe losses induced by photodarkening phenomenon. In this paper we demonstrate for the first time that Al-silicate Yb-doped fibers with high-inversion and doping concentration above 1 wt% can be successfully used by implementing a simple optical bleaching scheme. A co-injecti...
متن کاملPhotodarkening of Infrared Irradiated Yb-Doped Alumino-Silicate Glasses: Effect on UV Absorption Bands and Fluorescence Spectra
The photodarkening phenomenon in alumino-silicate glass preforms, doped with different ytterbium concentrations, was studied. The UV band, comprised between 180 and 350 nm, was examined before and after irradiation at 976 nm. The non-linear dependence of 240 nm band with concentration after infra-red irradiation was demonstrated and ascribed predominantly to Yb 3+ pair’s interaction. The emissi...
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تاریخ انتشار 2005