Journal
OPTICS EXPRESS
Volume 16, Issue 9, Pages 6471-6478Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.16.006471
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We report terahertz-wave generation in the wavelength range of 190 similar to 210 and 457 similar to 507 mu m from forward and backward difference frequency generations, respectively, in a 3.2-cm long multi-grating periodically poled lithium niobate (PPLN) crystal. The grating period of the PPLN crystal varies form 63 to 70 mu m in 1-mu m increments. The extraordinary refractive index of lithium niobate in the THz-wave range was precisely deduced from the quasi-phase-matching condition of the difference frequency generations. (C) 2008 Optical Society of America.
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