High frequency electromagnetic wave detection system and high frequency electromagnetic wave method of detection

摘要

To constitute a system for detecting high frequency electromagnetic waves (millimeter waves) at low costs and operate the system stably. SOLUTION: There are set a CW laser 34 for generating a CW laser light and an output part (oscillators 31 and 32, modulator 33 and antenna 17) for outputting intensity-modulated millimeter waves, an electro-optic crystal 19 for emitting the CW laser light entering from the CW laser after polarizing and changing the CW laser light to a CW laser light conforming to an intensity of the millimeter waves inputted from the output part, a photo detector 22 to which the polarized CW laser light is inputted and which converts the CW laser light to electrical signals corresponding to a quantity of the polarization and a polarization beam splitter 21 for outputting a P polarized light of the CW laser light emitted from the electro-optic crystal 19 to the photo detector and a compensating plate 20 adjusted to make zero a quantity of the CW laser light to be emitted to the polarization beam splitter from the electro-optic crystal when no millimeter waves are inputted.