Patent ID: 11867621
Assignee: NIKON CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 17:
18. A terahertz light detector comprising:
a light reception unit that receives terahertz light from a measured object;
a pulse laser that generates pulse light;
a branch unit that receives the pulse light from the pulse laser and outputs a first portion of the pulse light as pump pulse light and outputs a second portion of the pulse light as probe pulse light;
a first optical fiber having an anomalous dispersion and which the probe pulse light enters;
a second optical fiber having an anomalous dispersion and which the pump pulse light enters;
a photoconductive member that receives the pump pulse light from the second optical fiber and that generates the terahertz light that is sent to the measured object; and
a control unit that controls an energy of the probe pulse light which enters the first optical fiber and that controls an energy of the pump pulse light which enters the second optical fiber, wherein
the pump pulse light that has entered the second optical fiber is emitted from the second optical fiber with a delay time corresponding to the energy of the pump pulse light, and
the light reception unit outputs a signal that is dependent on an intensity of the terahertz light received from the measured object when the probe pulse light emitted from the first optical fiber enters the light reception unit.