Abstract
We investigate theoretically the performance of a terahertz parametric oscillator (TPO) using LiTaO3 (LT) with the pump-wavelength tuning method. The frequency tuning accuracy of the LT-TPO is potentially superior to that of a TPO using LiNbO3 (LN) under the same conditions. The variation of the radiation angle of THz waves coupled from the Si prism of the LT-TPO is up to about 20° lower than that for the LN-TPO for a pump-wavelength tuning range of 0.4–1.6 μm. Although the THz-wave parametric gain characteristics of LiTaO3 are somewhat unsatisfactory compared with those of LiNbO3, the LT-TPO with pump-wavelength tuning can still show potential for high-performance operation, with the excellent optical properties of the LiTaO3.
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