Abstract
We demonstrate a widely tunable terahertz (THz) -wave parametric oscillator (TPO) in a ring cavity configuration using a novel frequency-tuning method involving rotating a single mirror forming the cavity. The TPO consisted of a nonlinear optical MgO: LiNbO3 crystal in a three-mirror ring cavity. We obtained continuous tuning of THz-wave in the 0.93 to 2.7 THz range by adjusting the mirror. The maximum THz-wave output of 69.6 pJ/pulse at 1.3 THz was coupled out from a single Si prism coupler. The absorption of HCl gas was measured in order to check the tuning controllability. The high performance of the TPO was confirmed from the transmission dip of the measured spectrum in agreement with the known center absorption lines.
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