Picosecond pulses from an amplified diode-pumped mode-locked Nd:YLF laser have been efficiently doubled in a periodically poled lithium niobate sample with an effective nonlinear coefficient >15pm/V. An average green power of 330 mW was produced in cw mode-locked operation with an average conversion efficiency of 52%. With a quasi-cw mode-locked pulse train, 1.3 W of green (average power within 10 ps envelope) was generated with an average conversion efficiency of 65%. We measured for both output-fundamental and second harmonic beams a beam quality factor M2~l.l.

© 1996 Optical Society of America

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