Forward and backward terahertz-wave difference-frequency generations from periodically poled lithium niobate.
We report terahertz-wave generation in the wavelength range of 190 - 210 and 457 - 507 microm 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 microm in 1-microm 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.
Wang
T D
TD
Institute of Photonics Technologies, Department of Electrical Engineering, National Tsing-hua University, Hsinchu 30013, Taiwan.
Lin
S T
ST
Lin
Y Y
YY
Chiang
A C
AC
Huang
Y C
YC
D009556:Niobium / Q000737:chemistry*; D055095:Optics and Photonics; D010087:Oxides / Q000737:chemistry*; D012031:Refractometry; D012825:Silicon
D010087:Oxides; D009556:Niobium; C091692:lithium niobate; D012825:Silicon