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Proceedings Paper

Fluorescence lifetime and 980-nm pump energy transfer dynamics in erbium and ytterbium co-doped phosphate laser glasses
Author(s): Ruikun Wu; John D. Myers; Michael J. Myers; Charles Frederick Rapp
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Paper Abstract

Phosphate glasses are attractive laser oscillator/amplifier materials because unlike fluoride, silicate, and other laser glass materials it combines attractive properties such as good chemical durability, ion-exchangeability, high gain, low concentration quenching, and low upconversion losses. Phosphate glasses also exhibit very high solubility for rare earth ions. This feature permits the introduction of large concentrations of active ions into relatively small volumes resulting in smaller laser devices with high-energy storage capabilities. These high dopant concentrations also result in very rapid and efficient energy transfer between rare earth ions. This allows for the effective use of Yb3+ as a sensitizer for the Er3+ laser ion. Effective Er:Yb:Glass pumping, energy storage, and energy extraction involves the population of the 2F5/2 level of Yb3+ (~2ms fluorescence lifetime) and transferring energy to the 4I11/2 level of Er3+ (~500μsec transfer time); and a very rapid (< 1μsec) nonradiative decay of the Er3+ from the 4I11/2 state (with an 8ms fluorescence lifetime). In this study we measured the fluorescence lifetime for the 4I13/2 level of Er+3 on different glass samples with various concentrations of erbium. The data indicates that for doping levels up to 7% (wt.%) Er2O3 the lifetime remains above 7.0ms. Theoretically, this highly doped glass may produce greater than 20dB gain in 1cm path length. In additional fluorescence lifetime testing, ytterbium doped and erbium/ytterbium co-doped glasses samples were evaluated for concentration quenching and energy transfer rate as function of the Er3+ concentration rates. The effect on teh energy transfer efficiency and laser efficiency was analyzed.

Paper Details

Date Published: 17 June 2003
PDF: 7 pages
Proc. SPIE 4968, Solid State Lasers XII, (17 June 2003); doi: 10.1117/12.478261
Show Author Affiliations
Ruikun Wu, Kigre, Inc. (United States)
John D. Myers, Kigre, Inc. (United States)
Michael J. Myers, Kigre, Inc. (United States)
Charles Frederick Rapp, Kigre, Inc. (United States)

Published in SPIE Proceedings Vol. 4968:
Solid State Lasers XII
Richard Scheps, Editor(s)

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