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For obtaining efficient passively Q-switched laser at 473nm, an Nd:YAG/YAG/Cr4+:YAG/YAG composite crystal and a coupled cavity were employed to reduce the thermal lens effect and enable the laser system operating on high pumped power. In our experiment, the maximum average output power of 0.81W was obtained with the repetition rate of 28.5kHz and the pulse width of 104ns at the pumped power of 9.79W,...
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