Energy scaling and extended tunability of a ring cavity terahertz parametric oscillator based on KTiOPO<sub>4</sub> crystal

Energy scaling and extended tunability of a ring cavity terahertz parametric oscillator based on KTiOPO₄ crystal

Wang Yuye^{1, 2}, Ren Yuchen^{1, 2}, Xu Degang^{1, 2, †}, Tang Longhuang^{1, 2}, He Yixin^{1, 2}, Song Ci^{3, ‡}, Chen Linyu^{1, 2}, Li Changzhao^{1, 2}, Yan Chao^{1, 2}, Yao Jianquan^{1, 2}

(color online) Schematic diagram of the experimental setup for the KTP-TPO system based on a SE ring-cavity configuration. The inset shows the noncollinear phase matching condition for THz wave generation in KTP: k_p = k_S + k_T.