Journal
OPTICS LETTERS
Volume 29, Issue 15, Pages 1775-1777Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.29.001775
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Near-stoichiometric lithium tantalate (SLT) crystals were produced from congruent lithium tantalate by a vapor-transport equilibration process. Because of the resultant increase in photoconductivity and reduction in photogalvanism, the crystals showed no observable photorefractive damage at 514.5 nm up to the highest intensity used, 2 MW/cm(2). The crystals also exhibited low green-induced infrared absorption, a Curie temperature of 693 degreesC, and a coercive field of 80 V/mm. The SLT samples were periodically poled with an 8-mum-period grating, permitting first-order quasi-phase-matched second-harmonic generation of 532-nm radiation at 43 degreesC. A 17-mm-long sample generated 1.6 W of continuous-wave output power at 532 nm for 50 h. With 150-ns pulses at a 100-kHz repetition rate in the same sample, 5-W average-power, 532-nm radiation was generated for 1000 h. No damage to the crystal and no aging effects were observed during these experiments. (C) 2004 Optical Society of America.
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