Schaar J E, Vodopyanov K L, Fejer M M
Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA.
Opt Lett. 2007 May 15;32(10):1284-6. doi: 10.1364/ol.32.001284.
We generated 1 mW of average output power at 2.8 THz (bandwidth of approximately 300 GHz) in a diffraction-limited beam by placing a 6-mm-long quasi-phase-matched GaAs crystal inside the cavity of a synchronously pumped optical parametric oscillator (OPO). The OPO used type-II-phase-matched periodically poled lithium niobate as a gain medium and was pumped by a mode-locked laser at 1064 nm, with a 7 ps pulse duration, 50 MHz repetition rate, and 10 W average output power. The terahertz radiation was generated by difference frequency mixing between the signal and idler waves of the near-degenerate doubly resonant OPO.
通过将一块6毫米长的准相位匹配砷化镓晶体置于同步泵浦光学参量振荡器（OPO）的腔内，我们在衍射极限光束中于2.8太赫兹（带宽约为300吉赫兹）处产生了1毫瓦的平均输出功率。该OPO使用II型相位匹配的周期性极化铌酸锂作为增益介质，并由一台锁模激光器在1064纳米处泵浦，脉冲持续时间为7皮秒，重复频率为50兆赫兹，平均输出功率为10瓦。太赫兹辐射是由近简并双共振OPO的信号波和闲频波之间的差频混频产生的。
