Study Of Generation And Detection Of Terahertz Wave Using A Parametric Process

Terahertz wave with unique properties has significant scientific research values andwide applications in the field of imaging, non-destructive testing, environmental monitoring,communication, security and so on. Recently, Generation and detection terahertz wave usinga parametric process has attracted more and more attention due to its advantages such asnarrow linewidth, continously tunable, room temperature operation, compact structure, etc.Based on the stimulated Raman scattering of polariton in lithium niobate, in this thesis, wefocus on terahertz wave radiation source, narrow linewidth terahertz wavelength meter,threshold pump of terahertz wave radiation source, and the theories and experiments ofterahertz wave detection. The detailed research contents can be found as follows.(1) We experimentally investigate two different coupling methods, which are siliconprisms coupler TPOand surface emitted TPO. The main factors which limit the frequencytuning range are discussed. Moreover, the impacts of the photorefractive effect in lithiumniobate on the terahertz wave output are quantitatively studied. For surface emitted TPO,terahertz wave output efficiencies and frequency tuning ranges of three differentconfigurations are measured.(2) A terahertz wavelength meter for direct wavelength measurements of narrowlinewidth terahertz wave is designed and fabricated.(3) We construct the system consisted of both terahertz wave generation and detectionusing a parametric process. The main system noise sources are analyzed and discussed. Wehave measured the signal-to-noise of terahertz wave detection with the parametric processmethod,高莱ç›'and pyroelectric detector.