摘要
讨论了准相位匹配(QPM)技术中的非线性光频转换谐波振幅方程和谐波转换效率.从振幅耦合波基本方程出发,考虑QPM晶体的非线性极化率的周期性调制特点,推导出理想情况下的谐波振幅,以及畴反转结构存在误差时的谐波振幅方程.与双折射相位匹配技术相比,在QPM技术中若利用晶体中最大的非线性光学系数,则有较高的转换效率,对于KTP晶体,二次谐波转换效率比值可达到10.2,对于LiNbO3晶体转换效率比值可达到20.该理论研究定量说明在QPM技术中有较高的非线性光频转换效率.
The harmonic amplitude equation and the generation efficiency of nonlinear optical frequency conversion （NOFC） in quasi-phase-matching （QPM） were discussed. Based on the interaction equation of light wave and the periodical modulation on nonlinear susceptibility of QPM crystal, one ideal harmonic amplitude equation and another equation deviating from domain-reversal-structure were deduced. Utilized the maximal nonlinear optics coefficient of crystal, conversion efficiency of the QPM is higher than the birefringent-phase-matching（EPM）. For KTiOPO4 and LiNbO3,the ratios of the second harmonic generation efficiency reach to 10. 2 and 20 respectively. These theoretical results quantitatively show that the efficiency of NOFC is high in QPM.
出处
《西安工业大学学报》
CAS
2007年第3期209-211,共3页
Journal of Xi’an Technological University
基金
陕西省教育厅专项科研计划项目(06JK283)
关键词
非线性光学
谐波转换效率
耦合波方程
准相位匹配
周期极化晶体
nonlinear optics
harmonic generation efficiency
interaction equation of light wave
QPM
periodically poled crystal
