Theoretical analysis of terahertz parametric oscillator using KTiOPO4 crystal

• Terahertz wave generation with KTiOPO4 is investigated.
• The expression of effective parametric gain length is deduced.
• Gain characteristics of THz-wave in KTiOPO4 are simulated for the first time.
• The characteristics of KTP for TPO are compared with MgO:LiNbO3.

Terahertz parametric oscillator (TPO) using KTiOPO4 (KTP) crystal with a noncollinear phase-matching scheme is investigated. Frequency tuning characteristics of terahertz wave (THz-wave) by varying the phase-matching angle and pump wavelength are analyzed. The expression of the effective parametric gain length under the noncollinear phase matching condition is deduced. Parametric gain and absorption characteristics of THz-wave in KTP are theoretically simulated for the first time. The characteristics of KTP for TPO are compared with MgO:LiNbO3. The analyses indicate that KTP is more suitable than MgO:LiNbO3 for TPO.