Forward and backward THz-wave difference frequency generations from a rectangular nonlinear waveguide

作者：Huang Yen Chieh^*; Wang Tsong Dong; Lin Yen Hou; Lee Ching Han; Chuang Ming Yun; Lin Yen Yin; Lin Fan Yi

来源：Optics Express, 2011, 19(24): 24577-24582.

We report forward and backward THz-wave difference frequency generations at 197 and 469 mu m from a PPLN rectangular crystal rod with an aperture of 0.5 (height in z) x 0.6 (width in y) mm(2) and a length of 25 mm in x. The crystal rod appears as a waveguide for the THz waves but as a bulk material for the optical mixing waves near 1.54 mu m. We measured enhancement factors of 1.6 and 1.8 for the forward and backward THz-wave output powers, respectively, from the rectangular waveguide in comparison with those from a PPLN slab waveguide of the same length, thickness, and domain period under the same pump and signal intensity of 100 MW/cm(2).

• 出版日期2011-11-21
• 单位清华大学