Phosphate content influence on structural, spectroscopic, and lasing properties of Er,Yb-doped potassium-lanthanum phosphate glasses

Jan Šulc; Richard Švejkar; Helena Jelínková; Karel Nejezchleb; Karel Nitsch; Antonín Cihlár; Robert Král; Martin Ledinsky; Antonn Fejfar; Miroslava Rodov; Petra Zemenová; Martin Nikl

doi:10.1117/1.OE.55.4.047102

5 April 2016 Phosphate content influence on structural, spectroscopic, and lasing properties of Er,Yb-doped potassium-lanthanum phosphate glasses

Jan Šulc, Richard Švejkar, Helena Jelínková, Karel Nejezchleb, Karel Nitsch, Antonín Cihlár, Robert Král, Martin Ledinsky, Antonn Fejfar, Miroslava Rodov, Petra Zemenová, Martin Nikl

Author Affiliations +

Optical Engineering, Vol. 55, Issue 4, 047102 (April 2016). https://doi.org/10.1117/1.OE.55.4.047102

Abstract

The influence of the phosphorus pentoxide (P₂O₅) content on the material properties of Er,Yb-doped potassium-lanthanum phosphate glass was studied. Glass samples of the following nominal composition 35.0K₂O-6.8Yb₂O₃-8.0La₂O₃-0.2Er₂O₃-50.0P₂O₅ (in mol%) were prepared from starting materials mixed with five additional amounts of P₂O₅ (0, 7.5, 15.0, 30.0, and 45.0 mol% related to the nominal glass composition). The P₂O₅ addition influence on properties of prepared glasses was studied using Raman, absorption, and fluorescence spectroscopy. The glass residual IR absorption and Judd–Ofelt intensity parameters together with absorption and emission cross sections were estimated. The results showed the increasing polymerization of glass and the P─O bond shortening with P₂O₅ content increase. The spectroscopy of Er³⁺ and Yb³⁺ ions was affected only marginally by the glass composition. It was found that fluorescence decay time corresponding to upper-laser-level ⁴I_13/2 increased with the decrease of P₂O₅ content in the glasses, which was related to increasing OH− contamination of the glass. The laser action at 1.53 μm under 975-nm pulsed laser diode pumping was successfully demonstrated. Low threshold and laser slope efficiency up to 21% in respect to absorbed pumping power were obtained.

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Jan Šulc, Richard Švejkar, Helena Jelínková, Karel Nejezchleb, Karel Nitsch, Antonín Cihlár, Robert Král, Martin Ledinsky, Antonn Fejfar, Miroslava Rodov, Petra Zemenová, and Martin Nikl "Phosphate content influence on structural, spectroscopic, and lasing properties of Er,Yb-doped potassium-lanthanum phosphate glasses," Optical Engineering 55(4), 047102 (5 April 2016). https://doi.org/10.1117/1.OE.55.4.047102

Published: 5 April 2016

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