Tm-doped vanadates under pulsed pumping with variable duty-cycle: impact on lasing and fluorescence

Jan Šulc; Pavel Černý; Helena Jelínková; Witold Ryba-Romanowski; Radoslaw Lisiecki; Piotr Solarz; Grazina Dominiak-Dzik; Yoshiharu Urata; Mikio Higuchi

doi:10.1117/12.779298

22 April 2008 Tm-doped vanadates under pulsed pumping with variable duty-cycle: impact on lasing and fluorescence

Jan Šulc, Pavel Černý, Helena Jelínková, Witold Ryba-Romanowski, Radoslaw Lisiecki, Piotr Solarz, Grazina Dominiak-Dzik, Yoshiharu Urata, Mikio Higuchi

Author Affiliations +

Proceedings Volume 6998, Solid State Lasers and Amplifiers III; 69980T (2008) https://doi.org/10.1117/12.779298
Event: SPIE Photonics Europe, 2008, Strasbourg, France

Abstract

Lasing and fluorescence behavior of thulium doped YVO₄, GdVO₄, and LuVO₄ single crystals were investigated under pulsed pumping with variable duty cycle up to CW. This allowed us to study properties of these crystals in dependence on thermal load in a broad range. Following crystals were investigated: Tm:YVO₄ (5 at.% Tm/Y, grown by the Czochralski technique), Tm:GdVO₄ (2, 4, and 6 at.% Tm/Gd, grown by the floating-zone technique), and Tm:LuVO₄ (3 at.% Tm/Y, grown by the floating-zone technique). For pumping a fibre-coupled (core diameter 400 μm) laser diode operating in range from 800 up to 803nm was used (available CW power 20 W). All tested crystals were investigated under CW and pulsed pumping (pulse length 4 ms). Under pulsed pumping (4% duty cycle), the lasing was demonstrated with all samples. Under CW pumping only Tm:GdVO₄ crystal was lasing. For Tm:YVO₄ and Tm:LuVO₄ crystals, a lasing was not reached for pumping with duty cycle higher than 60 %, and the strong blue emission was observed. Detailed measurement of visible emission for broad range of pumping duty cycles (from 4 up to 60%) showed the exponential increase of Tm³⁺ integral emission intensity in bands around 480 and 700 nm. Comparison with the results obtained for fixed duty cycle and variable crystal holder temperature (290 - 310 K) allowed us to find a relation between the duty cycle and temperature of pumped part of the crystal. Measurement of infrared fluorescence temporal behavior in dependence on duty cycle gives us possibility to study a relative population of lasing level in dependence on temperature.

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Jan Šulc, Pavel Černý, Helena Jelínková, Witold Ryba-Romanowski, Radoslaw Lisiecki, Piotr Solarz, Grazina Dominiak-Dzik, Yoshiharu Urata, and Mikio Higuchi "Tm-doped vanadates under pulsed pumping with variable duty-cycle: impact on lasing and fluorescence", Proc. SPIE 6998, Solid State Lasers and Amplifiers III, 69980T (22 April 2008); https://doi.org/10.1117/12.779298

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