Abstract
Using a new saturable absorber Cr 4+:YAG as passive Q-switch, we have realized the Q-switched laser running at 0.531 μm with an NYAB self-frequency doubling crystal and measured the single pulse energy and the pulse width under different small-signal transmissions of Cr 4+:YAG and different cavity lengths. Meanwhile, the coupling wave rate equations for Cr 4+:YAG as a passive Q-switch are given and the experimental results agree with the numerical solution of equations.
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