Journal
OPTICS LETTERS
Volume 31, Issue 7, Pages 957-959Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.31.000957
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Surface-emitted terahertz- (THz-) wave generation by difference-frequency mixing with ridge-shaped periodically poled lithium niobate (PPLN) was demonstrated. The PPLN had a ridge height of 300 mu m, a thickness of 20 Am, and an interaction length of 35 mm. The ridge behaves as a slab waveguide for optical pump beams. The PPLN gives rise to THz waves in opposite directions, perpendicular to the pump-beam direction. Reflecting the THz wave on one side and overlapping it with the THz wave on the other side increased the total THz-wave intensity similar to 2.7 times compared with that without reflection and mixing. (c) 2006 Optical Society of America.
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