23 December 2003 CW Tm:GdVO4 laser pumped by 808-nm laser diodes operated at room temperature
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A high-quality gadolinium vanadate (GdVO4) crystal of 7 at.% thulium (Tm) in the starting material was grown by the Czochralski technique. The measured absorption spectra exhibited sufficient absorption coefficients for LD pumping: 6.0 cm-1 for π polarization and 6.2 cm-1 for σ polarization. Laser oscillation was carried out using single-stripe, 808-nm LDs in an end-pumping configuration. A slope efficiency of 28% and a threshold of 750 mW were exhibited with respect to the absorbed pump power. An output power of 420 mW was achieved at the absorbed power of 2.4 W. It was demonstrated that Tm:GdVO4 is actually useful material for 2-μm lasers, particularly in the compact LD-pumped system.
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Yoshiharu Urata, Yoshiharu Urata, Satoshi Wada, Satoshi Wada, "CW Tm:GdVO4 laser pumped by 808-nm laser diodes operated at room temperature", Proc. SPIE 5154, Lidar Remote Sensing for Environmental Monitoring IV, (23 December 2003); doi: 10.1117/12.504527; https://doi.org/10.1117/12.504527

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