Abstract
A 2047.9-nm acousto-optically Q-switched Ho:GdVO4 laser pumped by two laser diodes at 1.94 µm was demonstrated in this paper. By using a 1.0 at.%-doped Ho:GdVO4 crystal as the gain medium, a maximum output power of 8.08 W was obtained with the absorbed pump power of 28.12 W in the continuous-wave mode, corresponding to a slope efficiency of 45.7 %. In Q-switch mode, the highest pulse energy of 1.29 mJ with a pulse width of 4.3 ns was achieved at pulse repetition frequency of 5 kHz, corresponding to a peak power of 300.5 kW. Moreover, the beam quality factor (M2) of 1.6 was estimated by the 90/10 knife-edge method at maximum output level. As far as we know, this is first operation of acousto-optically Q-switched Ho:GdVO4 laser directly pumped by laser diode.
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