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Proceedings Paper

Influence of undoped YAG cap on diode-pumped composite YAG/Er:Yb:glass laser
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Paper Abstract

Two samples of Er-Yb doped phosphate glass were tested as a gain medium of longitudinally diode pumped laser. One sample was a simple Er:Yb:glass rod (length 2.8 mm), second sample was composite rod consisting of 2.8mm long Er:Yb:glass and 6mm long YAG crystal. Diameter of both samples was 6 mm. Dopant concentration for Er:Yb:glass was 0.75 × 1020 cm−3 Er and 1.7 × 1021 cm−3 Yb. The goal of the experiment was to investigate an effect of the undoped YAG cap on the Er:Yb:glass laser operation. The active medium, fixed in cupreous heatsink, was placed inside the 150mm long resonator consisted of a flat pumping mirror (HR @ 1.52−1.65 μm, HT @ 0.97 μm) and curved output coupler (r = 150 mm, R = 97% @ 1.52−1.61 μm). For Er:Yb:glass pumping a fiber coupled laser diode, operating in pulsed regime, was used. The pumping pulse width, energy, and wavelength were 1 ms, 10 mJ, and 975 nm, respectively. The decrease of Er:Yb:glass laser output pulse energy with increasing pumping repetition rate was observed for both samples. In case of simple Er:Yb:glass the energy dropped from 1.4mJ to 0.6mJ after pumping duty cycle increase from 0.5% to 6 %. In case of composite YAG/Er:Yb:glass active medium the relative output energy decrease was only 20% for pumping duty cycle increase from 0.5% to 10%. This result showed that the slope of the output energy decrease with increasing duty cycle was approximately four times slower for composite active media in comparison with simple Er:Yb:glass.

Paper Details

Date Published: 15 February 2012
PDF: 7 pages
Proc. SPIE 8235, Solid State Lasers XXI: Technology and Devices, 82351Z (15 February 2012);
Show Author Affiliations
Jan Šulc, Czech Technical Univ. in Prague (Czech Republic)
Helena Jelínková, Czech Technical Univ. in Prague (Czech Republic)
Karel Nejezchleb, Crytur, Ltd. (Czech Republic)
Václav Škoda, Crytur, Ltd. (Czech Republic)

Published in SPIE Proceedings Vol. 8235:
Solid State Lasers XXI: Technology and Devices
W. Andrew Clarkson; Ramesh K. Shori, Editor(s)

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