A passively mode-locked YAG:Nd laser was built. It was provided with a negative feedback loop based on a high-current photomultiplier. Trains of picosecond pulses were generated and the duration of these trains was several tens of microseconds. When steady-state operation was reached, the feedback loop was disconnected and a short train of picosecond pulses with an overall duration of ~?100 ns and an energy 1.5 mJ was generated. The energy stability of a second harmonic generated by such a short train was ? 1.5% when the efficiency of conversion to the second harmonic was low.
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Andreeva et al. (1989) studied this question.
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