Patent ID: 9417183
Filing Date: 2016-08-16
CPC Classification: G01N

Claim Text:
1. A terahertz wave temporal waveform acquisition apparatus comprising: a light source outputting pulsed light; a branch part branching the pulsed light output from the light source, outputting one beam of the branched light as pump light, and outputting another beam of the branched light as probe light; a terahertz wave generation element generating and outputting a terahertz wave by inputting the pump light output from the branch part; a terahertz wave detection element inputting the terahertz wave output from the terahertz wave generation element and passed through or reflected by a measurement object, inputting the probe light output from the branch part, and detecting a correlation value between the terahertz wave and the probe light; a delay providing medium disposed on an optical path of the terahertz wave from the terahertz wave generation element to the terahertz wave detection element, formed of a material of which a refractive index for the terahertz wave depends on the temperature, and configured to provide a delay according to the temperature to the terahertz wave; a temperature adjustment unit configured to adjust the temperature of the delay providing medium; and an analysis unit obtaining a temporal waveform of an electric field amplitude of the terahertz wave input to the terahertz wave detection element based on the correlation value detected by the terahertz wave detection element when the temperature of the delay providing medium is set to each value by the temperature adjustment unit.