Research on seed-injected terahertz wave parametric generator
The seed-injected terahertz wave parametric production source(is-TPG)is based on stimulated electromag-netic dipole scattering in nonlinear crystals,and has advantages of narrow line width,good coherence,room-tempera-ture operation,and tunability.In this paper,the tuning range,output energy,threshold,and other aspects of continu-ous/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 dif-ferent 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 practi-cal applications.The paper concludes with an analysis and outlook of its future development.
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