摘要
This paper investigates the performances of terahertz-wave parametric oscillators （TPOs） based on the LiNbO3 crystal at different pump wavelengths.The calculated results show that TPO characteristics,including the frequency tuning range,the THz-wave gain and the stability of THz-wave output direction based on the Si-prism coupler,can be significantly improved by using a short-wavelength pump.It also demonstrates that a long-wavelength-pump allows the employment of a short TPO cavity due to an enlarged phase-matching angle,that is,an increased angular separation between the pump and oscillated Stokes beams under the THz-wave generation at a specific frequency. The study provides an useful guide and a theoretical basis for the further improvement of TPO systems.
This paper investigates the performances of terahertz-wave parametric oscillators （TPOs） based on the LiNbO3 crystal at different pump wavelengths.The calculated results show that TPO characteristics,including the frequency tuning range,the THz-wave gain and the stability of THz-wave output direction based on the Si-prism coupler,can be significantly improved by using a short-wavelength pump.It also demonstrates that a long-wavelength-pump allows the employment of a short TPO cavity due to an enlarged phase-matching angle,that is,an increased angular separation between the pump and oscillated Stokes beams under the THz-wave generation at a specific frequency. The study provides an useful guide and a theoretical basis for the further improvement of TPO systems.
基金
Project supported in part by the Foundation for Innovative Research of Wuhan National Laboratory for Optoelectronics
the National Basic Research Program of China (Grant No 2007CB310403)
