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Modeling of THz Frequency Spectrum via Optical Rectification in THz Time Domain Spectroscopy  

Lee, Kang-Hee (Department of Physics, KAIST)
Yi, Min-Woo (Department of Physics, KAIST)
Ahn, Jea-Wook (Department of Physics, KAIST)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.28, no.2, 2008 , pp. 119-124 More about this Journal
Abstract
In recent years, gradually increasing interest has been directed to the use of terahertz technology in nondestructive testing and non-invasive measurements, and terahertz time domain spectroscopy (THz-TDS) has become a key technology in such applications. This paper deals with the terahertz pulse generation from cadmium telluride via optical rectification process of femto-second infrared laser pulses. The measured terahertz spectrum is compared with the result of model calculation based on space-time domain nonlinear Maxwell equations for coherent frequency mixing process. The propagation process of terahertz and infra-red pulses in the material as well as the surface interference and free space diffraction effects are also considered. The experimental results are in good agreements with the calculated spectrum.
Keywords
THz-Time Domain Spectroscopy; Optical Rectification; CdTe; Frequency Spectrum;
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