Q-switching of Yb:YGG, Yb:LuGG and Yb:CNGG lasers by a graphene saturable absorber
Yb:YGG, Yb:LuGG and Yb:CNGG compact diode-pumped lasers at 977 nm are passively Q-switched by a CVD-grown single layer graphene saturable absorber. With Yb:CNGG crystal, 190 ns/1.9 μJ pulses are generated at a repetition frequency of 235 kHz. This represents the highest pulse energy extracted from any graphene Q-switched Yb laser. The maximum average output power is 440 mW at 1045.1 nm with 24 % slope efficiency. With the Yb:YGG laser, the maximum output power reaches 462 mW at 1039.8 nm and the Q-switching conversion efficiency is as high as 55 %. Graphene is promising for generation of nanosecond pulses in Q-switched bulk Yb lasers at the frequencies approaching the MHz range.
KeywordsYtterbium lasers Gallium garnets Graphene Q-switching
This work was supported by the Spanish Government under Projects, MAT2013-47395-C4-4-R and TEC2014-55948-R, and by the Generalitat de Catalunya under Project 2014SGR1358. F.D. acknowledges additional support through the ICREA academia award 2010ICREA-02 for excellence in research. This work is part of a project that has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Grant Agreement No. 657630.
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