Abstract
Simultaneous Q-switching and mode-locking in a laser-diode end-pumped intracavity frequency doubled Nd:YVO 4/KTP green laser using Cr 4+:YAG saturable absorber is experimentally demonstrated. The influence of the initial transmission ( T 0) of the Cr 4+:YAG crystal on the Q-switched mode-locked green pulses as well as on the average green power is characterized by using Cr 4+:YAG crystal with various T 0. The effect of T 0 on the pulse build-up time in intracavity second harmonic configuration is theoretically investigated. It was found that the depth of modulation for the mode-locked pulses is greatly improved at the second harmonic wavelength as compared to that for the fundamental wavelength. The average pulse duration of the individual mode-locked pulse for the second harmonic beam measured to be less than 500 ps with a repetition rate of 400 MHz .
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