中国物理B ›› 2009, Vol. 18 ›› Issue (7): 2846-2852.doi: 10.1088/1674-1056/18/7/037

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Investigation of pump-wavelength dependence of terahertz-wave parametric oscillator based on LiNbO3

李恩邦1, 孙博2, 刘劲松2, 姚建铨3   

  1. (1)College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China; (2)Wuhan National Laboratory for Optoelectronics, College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; (3)Wuhan National Laboratory for Optoelectronics, College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
  • 收稿日期:2009-01-07 修回日期:2009-02-24 出版日期:2009-07-20 发布日期:2009-07-20
  • 基金资助:
    Project supported in part by the Foundation for Innovative Research of Wuhan National Laboratory for Optoelectronics and the National Basic Research Program of China (Grant No 2007CB310403).

Investigation of pump-wavelength dependence of terahertz-wave parametric oscillator based on LiNbO3

Sun Bo(孙博)a)†, Liu Jin-Song(刘劲松)a), Li En-Bang(李恩邦)b), and Yao Jian-Quan(姚建铨)a)b)   

  1. a Wuhan National Laboratory for Optoelectronics, College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; b College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
  • Received:2009-01-07 Revised:2009-02-24 Online:2009-07-20 Published:2009-07-20
  • Supported by:
    Project supported in part by the Foundation for Innovative Research of Wuhan National Laboratory for Optoelectronics and the National Basic Research Program of China (Grant No 2007CB310403).

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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.

Abstract: 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.

Key words: terahertz-wave parametric oscillator, THz-wave radiation, pump-wavelength dependence

中图分类号:  (Optical parametric oscillators and amplifiers)

  • 42.65.Yj
84.30.Ng (Oscillators, pulse generators, and function generators) 42.70.Nq (Other nonlinear optical materials; photorefractive and semiconductor materials) 42.79.Bh (Lenses, prisms and mirrors)