Abstract
Different techniques to control the pulse duration of a diode-pumped passively Q-switched intracavity frequency-doubled laser are studied, which shows that varying the pump beam radius in the gain medium and mode-spot sizes on a saturable absorber are two efficient ways to control the pulse duration. The output pulse durations obtained from a diode-pumped passively Q-switched Nd:GdVO4/KTP laser with a GaAs wafer can be controlled in a wide range over 100 ns, which indicates a simple way of controlling the pulse duration of the intracavity frequency-doubled passively Q-switched laser.
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