A diode-end-pumped acousto-optically Q-switched Nd:YVO4 914 nm laser with 2.4 W output power is reported for the first time. With intracavity frequency doubling using a 10-mm-long LBO, a maximum 457 nm blue output power of 526 mW is achieved at a repetition rate of 20 kHz. The conversion efficiency from the corresponding Q-switched fundamental output to blue output is 42%. The peak power of the Q-switched blue pulse is up to 175 W with 150 ns pulse duration. The fluctuation of the blue output power is less than 2.0% at the maximum output power. Incident pump power, W
An effective CW and pulsed laser operation was demonstrated using a grown-together Nd:YVO4/YVO4 composite rod. The slope efficiencies of 72.97% and 57.23% to absorbed pump power in multi-mode and TEM 00 mode were reached, respectively. In A-O Q-switched operation, a maximum average output power of about 10.5 W, a pulse width of 19.8 ns and a peak power of about 5.3 kW were achieved at 100 kHz. The pulse width kept less than 33 ns at 200 kHz.
Abstract:We present experimental investigation on quasi-threelevel operation of Nd:GdVO4 laser under 879 nm laser diode pumping into the emitting level. By using a 5-mm-long, 0.2-at.% bulk crystal, the maximal 3.65 W continuous wave 912 nm laser is obtained under 16.5 W pump power. The slope efficiency is 35.9% and the optical conversion efficiency is 22.1% with respect to the absorbed pump power. The beam quality factor is about 1.83 for 3.0 W output power at 912 nm. The good results demonstrate that the 879 nm direct pumping can also be used in the quasi-three-level systems.
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