Abstract
The terahertz wave has been attracted recently because of its wide ranging applications in various fields. Since the appearance of a high power near-infrared light source, coherent terahertz waves have been generated successfully using PC antennas, Q-switch Nd:YAG laser or femto second ultrashort pulses laser. Actually, however, there is no tunable and high-reputation terahertz wave source. Then, we have been focusing on picosecond pulsed laser, because picosecond pulsed laser has smaller linewidth than femtosecond pulse and higher-reputation than Q-switch Nd: YAG laser. In addition, picosecond pulses' peak power can be enhanced in a high finesse compact external cavity to overcome the threshold of terahertz parametric generation and oscillation, because the pulse is relatively small spatially, and the spectrum is relatively narrow. Therefore, we developed a terahertz parametric generator with an MgO-doped LiNbO 3 (MgO: LN) nonlinear crystal in an external ring cavity for the enhancement. Moreover, the generated idler light was recycled in the ring cavity to provide a contribution to parametric oscillation. As a result, we obtained terahertz wave radiation at high-reputation of 80MHz.
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