A diode-pumped actively Q-switched and mode-locked Nd:GdVO 4 laser with great average output power and high efficiency was realized by using a comparative simple configuration and a short cavity length. The laser generates stable mode-locked pulses of estimated width 240 ps lying underneath a Q-switched envelope of width 170 ns with a Q-switch modulation frequency of 10 kHz. The modulation depth was more than 90% and the mode-locked pulse inside the Q-switched pulse has a repetition rate of 390 MHz.
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Li et al. (2008) studied this question.