Injection-seeded terahertz-wave generator pumped by an all-solid-state single-mode Q-switch YAG laser

An all-solid-state tunable injection-seeded THz-wave parametric generator (is-TPG) was developed. It can emit the monochromatic THz-wave over a wide tunable frequency range from 0.4 THz to 2.8 THz. The frequency scanning rate was as fast as 3GHz/second for the step resolution of 6 MHz by using the 500 Hz high-repetition-rate Q-switch Nd:YAG laser as a pump source. The linewidth of the THz-wave was shown to be lower than 40 MHz by the measurement of absorption lines of water vapor at low pressure.