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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...
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