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Proceedings Paper

Effect of cryogenic temperature on spectroscopic and laser properties of Er, Yb-doped potassium-lanthanum phosphate glass
Author(s): Richard Švejkar; Jan Šulc; Michal Němec; Helena Jelínková; Karel Nitsch; Antonín Cihlář; Robert Král; Karel Nejezchleb; Martin Nikl
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Paper Abstract

Glass matrix doped with rare-earth ions is a promising laser active medium for high power laser systems. Due to amorphous structure of glasses the absorption and emission spectra lines are broader in comparison with crystalline materials thus pumping radiation can be absorbed efficiently, moreover much broader gain bandwidth is suitable for generation of ultra-short pulses. Another advantage of the glass matrix is the possibility to fabricate large volume ingots and simultaneously preservation of sufficient optical quality. The lower thermal conductivity of glasses can be compensated by geometry of the active medium for instance shaped into fibres or discs. We present temperature dependence of spectroscopic and laser properties of newly developed Er, Yb - doped potassium-lanthanum phosphate glass, which is appropriate for generation of radiation at 1.53 μm. The sample of Er,Yb:KLaP glassy mixture was cut into disc shape with dimensions of 2.5 mm (thickness) and 5 mm (diameter) and its faces were polished plan-parallelly without being anti-reflection coated. The temperature dependence of the transmission and emission spectra Er,Yb:KLaP together with the fluorescence decay time were measured the temperature range from 80 to 400 K. The fluorescence lifetime of manifold 4I13/2 (upper laser level) prolonged and the intensity of up-conversion radiation decreased with decreasing temperature. The longitudinal excitation of Er,Yb:KLaP was carried out by a fibre-coupled laser diode (pulse duration 2 ms, repetition rate 10 Hz, pump wavelength 969 nm). Laser resonator was hemispherical, with flat pumping mirror (HR @ 1.5 μm) and spherical output coupler (R = 98 % @ 1.5 - 1.6 μm). The Er,Yb:KLaP glass laser properties were investigated in the temperature range 80 - 300 K. The highest slope efficiency with respect to absorbed pumped power was 6.1 % at 80 K. The maximum output of peak amplitude power was 0.71 W at 80 K, i.e. 1.2 times higher than at 300 K. Tunability of laser wavelength at 80 K in range 1528 - 1552 nm was obtained using MgF2 birefringent filter. From our measurement it can be concluded, that spectroscopic and laser properties of newly developed Er,Yb:KLaP glass are slightly temperature dependent.

Paper Details

Date Published: 11 May 2017
PDF: 7 pages
Proc. SPIE 10238, High-Power, High-Energy, and High-Intensity Laser Technology III, 102380V (11 May 2017); doi: 10.1117/12.2264673
Show Author Affiliations
Richard Švejkar, Czech Technical Univ. in Prague (Czech Republic)
Jan Šulc, Czech Technical Univ. in Prague (Czech Republic)
Michal Němec, Czech Technical Univ. in Prague (Czech Republic)
Helena Jelínková, Czech Technical Univ. in Prague (Czech Republic)
Karel Nitsch, Institute of Physics of the ASCR, v.v.i. (Czech Republic)
Antonín Cihlář, Institute of Physics of the ASCR, v.v.i. (Czech Republic)
Robert Král, Institute of Physics of the ASCR, v.v.i. (Czech Republic)
Karel Nejezchleb, Crytur, Ltd. (Czech Republic)
Martin Nikl, Institute of Physics of the ASCR, v.v.i. (Czech Republic)


Published in SPIE Proceedings Vol. 10238:
High-Power, High-Energy, and High-Intensity Laser Technology III
Joachim Hein, Editor(s)

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