种子注入式太赫兹波参量产生源研究

Research on seed-injected terahertz wave parametric generator

种子注入式太赫兹波参量产生源(is-TPG)基于非线性晶体中的受激电磁偶子散射,具有线宽窄、相干性好、室温运转、可调谐等优点。本文基于5%摩尔百分比氧化镁掺杂的同成分铌酸锂晶体(MgO:CLN),对连续/脉冲种子注入式太赫兹波参量产生源(is/ips-TPG)调谐范围、输出能量、阈值等方面进行了研究。相比于is-TPG系统,ips-TPG系统调谐范围范围扩大约80%。is-TPG系统与ips-TPG系统3dB带宽分别为1THz与1.41THz,占各自调谐范围的51%和39%。ips-TPG系统相比is-TPG系统3dB带宽范围扩大了41%。在相近的平均功率密度下,由于ips-TPG具有更高的峰值功率密度降低了阈值,产生了更强的THz波输出,最大转换效率为1.01×10^(-5)。不同形式种子光的注入对太赫兹波参量辐射源有着显著的影响,实验结果表明ips-TPG系统的输出特性更为突出在实际应用中具有更高的价值。本文最后对其未来发展进行了分析和展望。

The seed injected terahertz wave parametric production source(is TPG)is based on stimulated electromagnetic dipole scattering in nonlinear crystals,and has advantages of narrow line width,good coherence,room temperature operation,and tunability.In this paper,the tuning range,output energy,threshold,and other aspects of continuous/pulsed seed injected terahertz wave parametric generation source(is/ips TPG)are investigated based on a 5% molar percentage magnesium oxide doped lithium niobate crystal(MgO∶CLN)of the same composition.Compared to the is TPG system,the tuning range of the ips TPG system is expanded by approximately 80%.The 3 dB bandwidths of the is TPG system and the ips TPG system are 1 THz and 1.41 THz,respectively,accounting for 51% and 39% of their respective tuning ranges.The ips TPG system extends the range of the 3dB bandwidth by 41% compared to the is TPG system.At similar average power densities,ips TPG produces a stronger THz wave output with a maximum conversion efficiency of 1.01×10^(-5) due to its higher peak power density lowering the threshold.The injection of different forms of seed light has a significant impact on the terahertz wave parametric radiation sources.The experimental results show that the output characteristics of the ips TPG system are more prominent and have higher value in practical applications.The paper concludes with an analysis and outlook of its future development.