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

Pham Van Hoi, Bui Huy, Do Thuy Chi

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.

Keywords


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

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DOI: https://doi.org/10.15625/0868-3166/20/2/2168 Display counter: Abstract : 38 views. PDF : 33 views.

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