To obtain THz generation we used an optical parametric oscillator with twoPPLN crystals in the same cavity to generate two signals as the source of DFG.

• 利用两个波长接近的信号光在倾斜周期PPLN中实现差频,产生THz波,通过对光学参量振荡PPLN晶体的温度和角度调谐,实现双波长信号光的可调谐运转,从而获得宽调谐范围的THz波输出;