基于光纤的太赫兹产生技术

Terahertz Generation Based on Optical Fibers

提出了一种新型的基于普通单模光纤的太赫兹辐射源。采用频率差在太赫兹范围的双波长激光器进行抽运,利用光纤的四波混频效应,得到结构紧凑、同时频率可调的连续波太赫兹辐射源。采用耦合波理论,详细分析了普通单模石英光纤中的四波混频过程,得到了太赫兹波输出功率的解析表达式。结果表明,抽运功率为1 kW时,可获得的太赫兹辐射峰值功率达到60 mW。该方案提供了一种新型的高功率、紧凑型、连续输出的太赫兹辐射源。

This paper proposes theoretically a novel terahertz source based on the conventional single-mode optical fibers.Utilizing four-wave-mixing effect in optical fibers and the dual-wavelength laser as the pump source,a compact,wide-tunable countinuous wave（CW） terahertz source is constructed.The four-wave mixing process has been discussed in detail through the coupled-wave theory,and the analytical expression of terahertz output power is obtained.It is shown that when the pump power is 1 kW,the terahertz peak power is about 60 mW.This scheme provides a possibility to realize a high-power and compact CW terahertz source.