Terahertz frequency domain spectrometer with phase modulation of source laser beam

摘要

A method and spectrometer for analyzing, identifying or imaging a target comprises generating CW signals in a range of frequencies between 100GHz to greater than 2THz and directing them to the target, acquiring spectral information from said frequencies interacting with said target and performing heterodyne down-conversion 209 for generating an electrical signal representative of some characteristics of the target. A lock-in amplifier at the CW signal modulation frequency, from phase controller 114, is used for the heterodyne detection of the terahertz signals.