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We report coupled-cavity resonant passive mode locking of a Nd:YLF laser. This technique has produced 4-ps pulses at a wavelength of 1.047 microm with 390-mW average power at a 250-MHz repetition rate, corresponding to a 1.6-nJ pulse energy. The Nd:YLF rod was pumped with 1.5 W of power at 798 nm from a Ti:sapphire laser. The nonlinear reflector used in the coupled cavity was an InGaAs/GaAs strained layer multiple-quantum-well sample.
Keller et al. (1991) studied this question.