We passively Q switched a diode-pumped Nd:YVO4 microchip crystal with
an antiresonant Fabry-Perot saturable absorber and achieved single-fre
quency pulses as short as 56 ps. We can vary the pulse width from 56 p
s to 30 ns and the repetition rate from 27 kHz up to 7 MHz by changing
the design parameters of the saturable absorber and the pump power. (
C) 1997 Optical Society of America.