A quasi-cw diode-pumped Nd:YAG laser, mode locked by a nonlinear mirror and stabilized by an acousto-optic modulator, has been developed that generates 31-ps, 23-mu J pulses. Employing this source with a periodically poled lithium niobate crystal in a traveling-wave geometry, we obtained extracavity frequency conversion with pump depletion of as much as 62% in the near infrared (1.46-1.56 mu m) with a pulse spectral width of 1.5 nm and a beam quality M-2 = 1.7. (C) 1997 Optical Society of America.
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