摘要
提出了一种周期极化铌酸锂(PPLN)晶体差频产生太赫兹(THz)波的新型结构。基于非线性晶体三波互作用理论模型,根据周期极化掺镁铌酸锂(PPMgLN)晶体的准相位匹配原理和掺铒光纤激光器(EDFL)双波长输出激光特性,并结合晶体折射率差公式,理论分析了工作温度及极化反转光栅周期对其输出THz波的影响,给出一定频率范围内其输出波长连续可调谐的实现方法。本文系统结构简单、成本低和调谐容易,激光器可室温运转。
As research in the field of the photoelectron and electromagnetic waves continues, the development of terahertz wave has attracted more and more attention. This paper proposes a new and potential structure of the tunable and narrow-band terahertz wave （THz-wave） radiation via the nonlinear optical difference frequency generation on a periodically poled Mg-doped lithium niobate （PPMgLN） crystal. According to quasi-phase-matching （QPM） in the PPLN crystal based on the theoretical model of three wave interactions in a nonlinear medium and the output characteristics of dual-wavelength erbium-doped fiber laser,the experimental refractive index difference on the periodically poled Mg-doped lithium niobate crystal is given. Through analyzing the working temperature and the grating period on its output of the THz-wave in theory,the reliable method to generate the continuous-tunable output wave through the PPMgLN in a small frequency range is obtained. The DFG device structure is relatively simple, low cost, and the tuning is easy to implement. In addition,the laser can be operated at room temperature.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2013年第12期2265-2269,共5页
Journal of Optoelectronics·Laser
基金
国家自然科学基金项目(61077069)资助项目
