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Quasi-continuous-wave generation at 589 nm in periodically poled KTP was achieved by sum-frequency mixing of synchronized mode-locked pulses emitted at 1064 and 1319 nm from two mode-locked Nd:YAG lasers. As acousto-optic mode lockers operated by the same frequency were used for mode locking, pulse trains were well synchronized with phase control of the radio frequency. The maximum output power at 589 nm was 260 mW mixing 1.9 W at 1064 nm and 0.88 W at 1319 nm. Conversion efficiency was reached to 14%, even for single-pass pumping using 5-mm-long periodically poled KTP.
© 2004 Optical Society of America
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