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Diode-laser-pumped high efficiency continuous-wave operation at 912 nm laser in Nd:GdVO4 crystal

✍ Scribed by X. Yu; F. Chen; J. Gao; X.D. Li; R.P. Yan; K. Zhang; J.H. Yu; Z.H. Zhang

Publisher: John Wiley and Sons
Year: 2009
Tongue: English
Weight: 139 KB
Volume: 6
Category: Article
ISSN: 1612-2011
DOI: 10.1002/lapl.200810095

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✦ Synopsis

High efficiency operation on continuous-wave (cw) 912 nm laser at room temperature in Nd:GdVO4 crystal pumped by 808 nm diode-laser is reported in this letter. The maximum output power of 8.0 W was obtained at the incident un-polarized pump power of 47.0 W, giving the corresponding optical-tooptical conversion efficiency of 17.0% and the average slope efficiency of 22.9%. Further tests show that the lasing threshold is reduced and the efficiency is increased evidently when using the π-polarized 808 nm pump source. 4.8 W 912 nm laser was achieved at the polarized pump power of 21.8 W, optical-tooptical conversion efficiency is increased to 22.0% and average slope efficiency is up to 33.6%.

Incident pump power, W 4 2 0 6 8 Output power at 912 nm, W 50 45 40 35 30 25 20 15 10 5 Pump spot size: 308 μm Pump spot size: 400 μm Pump spot size: 200 μm Linear fit of the data η s = 22.9%

Output powers of the 912 nm laser with three different couplers

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