Recent work [1] has demonstrated third harmonic generation of the nominally 1 micron output from Nd:Host materials operated in high repetition-rate Q-switched cavities. Relatively narrow fundamental pulse widths (10-20 ns) and non-critically phase-matched (NCPM) Type I doubling in LBO (150 deg. C phase match temperature) and Type II angle-tuned tripling permits good conversion efficiencies. In the present work, we describe third harmonic generation at 355 nm from intracavity-tripled, diode-pumped Nd:YVO4 utilizing an angle-tuned, room-temperature LBO doubler and tripler, and operated at high repetition rates with improved efficiency. An average UV power of over 2 Watts at 30 KHz and 1 watt at 100 KHz is typically obtained with a 20 Watt SDL CW diode array “bar” side-pumping a 1% Nd:YVO4 slab.

© 1996 Optical Society of America

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