Patent ID: 7221451

Claim:
A multi-channeled measuring apparatus for measuring a spectrum of a terahertz pulse comprising: a terahertz pulse source pumped by an ultrashort pulsed pumping light and generating a terahertz pulse; a white light pulse source generating a white light pulse by being irradiated by an ultrashort pulsed probe light; a stretching means for stretching and chirping the white light pulse generated by the white light pulse source; an electro-optic crystal irradiated by the terahertz pulse generated by the terahertz pulse source and the chirped white light pulse stretched and chirped by the stretching means overlapped to the terahertz pulse in a time domain for modulating the chirped white light pulse by an electric field signal induced by the terahertz pulse; a multi-channeled spectral detecting means for detecting a spectrum of the chirped white light pulse modulated by the electro-optic crystal; and an analyzing means for analyzing the electric field signal of the terahertz pulse irradiated to the electro-optic crystal from the spectrum of the chirped white light pulse detected by the multi-channeled spectral detecting means, and obtaining a frequency spectrum of the terahertz pulse by using Fourier transform of the analyzed electric field signal.