Vol. 20 No. 2 (2010)
Papers

Effect of Excitation Migration and Upconversion in Highly Erbium-doped Glass Micro-sphere Lasers

Pham Van Hoi
Institute of Materials Science, VAST, and University of Engineering and Technology
Bui Huy
Institute of Materials Science, VAST
Do Thuy Chi
Thai Nguyen University of Education

Published 15-08-2012

Keywords

  • Highly Er-doped glass,
  • excitation migration and upconversion,
  • micro-cavity laser

How to Cite

Hoi, P. V., Huy, B., & Chi, D. T. (2012). Effect of Excitation Migration and Upconversion in Highly Erbium-doped Glass Micro-sphere Lasers. Communications in Physics, 20(2), 143. https://doi.org/10.15625/0868-3166/20/2/2168

Abstract

Excitation migration and upconversion process in the Erbium-doped silica-alumina glass microsphere lasers with concentrations of 2500-4000~ppm were investigated in detail. The experiment shows that under 976~nm excitation, the intense of up-conversion emission at 523, 546 and 657~nm, corresponding to the transitions $^{2}$H$_{11 / 2 } \to ^{4}$I$_{15 / }$, $^{4}$S$_{3 / 2} \to ^{4}$I$_{15 / 2}$, and $^{4}$F$_{9 / 2} \to ^{4}$I$_{15 / 2}$, respectively, $^{ }$depends on the erbium content, migration of excitation and pump power. The excitation migration has strongly influenced on the threshold and Red shift of lasing wavelength and migration-assisted up-conversion process leads to degraded amplification performance of microsphere lasers made by silica-alumina glasses with different contents of Er-ions.

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