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Optical Engineering

Phosphate content influence on structural, spectroscopic, and lasing properties of Er,Yb-doped potassium-lanthanum phosphate glasses
Author(s): Jan Šulc; Richard Švejkar; Helena Jelínková; Karel Nejezchleb; Karel Nitsch; Antonín Cihlár; Robert Král; Martin Ledinsky; Antonn Fejfar; Miroslava Rodov; Petra Zemenová; Martin Nikl
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Paper 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 4I13/2 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.

Paper Details

Date Published: 5 April 2016
PDF: 10 pages
Opt. Eng. 55(4) 047102 doi: 10.1117/1.OE.55.4.047102
Published in: Optical Engineering Volume 55, Issue 4
Show Author Affiliations
Jan Šulc, Czech Technical Univ. in Prague (Czech Republic)
Richard Švejkar, Czech Technical Univ. in Prague (Czech Republic)
Helena Jelínková, Czech Technical Univ. in Prague (Czech Republic)
Karel Nejezchleb, CRYTUR spol s.r.o. (Czech Republic)
Crytur Ltd. (Czech Republic)
Karel Nitsch, Wroclaw Univ. of Science and Technology (Czech Republic)
Institute of Physics of the ASCR, v.v.i. (Czech Republic)
Antonín Cihlár, Institute of Physics of the ASCR, v.v.i. (Czech Republic)
Robert Král, Institute of Physics of the ASCR, v.v.i. (Czech Republic)
Martin Ledinsky, Institute of Physics of the ASCR, v.v.i. (Czech Republic)
Antonn Fejfar, Institute of Physics of the ASCR, v.v.i. (Czech Republic)
Miroslava Rodov, Institute of Physics of the ASCR, v.v.i. (Czech Republic)
Petra Zemenová, Institute of Physics of the ASCR, v.v.i. (Czech Republic)
Univ. of Chemistry and Technology Prague (Czech Republic)
Martin Nikl, Institute of Physics of the ASCR, v.v.i. (Czech Republic)


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