Real-time continuous-wave terahertz imaging is demonstrated with a 1.63 THz(184.31μm) optically-pumped terahertz laser(OPTL) and a 124×124 element room-temperature pyroelectric camera.Transmission-mode THz imagi...Real-time continuous-wave terahertz imaging is demonstrated with a 1.63 THz(184.31μm) optically-pumped terahertz laser(OPTL) and a 124×124 element room-temperature pyroelectric camera.Transmission-mode THz imaging is pre-sented for the samples hidden in various wrapping materials.These experimental results reveal the possibility to construct a simple real-time THz imaging system applied to nondestructive inspection.展开更多
The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching,the optimum phase-matching wave bands of these...The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching,the optimum phase-matching wave bands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and InP are 0.95～1.38 mm and 0.7～0.96 mm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.展开更多
文摘Real-time continuous-wave terahertz imaging is demonstrated with a 1.63 THz(184.31μm) optically-pumped terahertz laser(OPTL) and a 124×124 element room-temperature pyroelectric camera.Transmission-mode THz imaging is pre-sented for the samples hidden in various wrapping materials.These experimental results reveal the possibility to construct a simple real-time THz imaging system applied to nondestructive inspection.
文摘The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching,the optimum phase-matching wave bands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and InP are 0.95～1.38 mm and 0.7～0.96 mm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.
