INFORMATION OBTAINING APPARATUS AND INFORMATION OBTAINING METHOD

摘要

An information obtaining apparatus includes a splitting unit, a terahertz wave generation unit, a terahertz wave detection unit, a fiber, a changing unit that changes an optical path length difference between optical path lengths of pump light and probe light by changing an optical path length of the fiber, a waveform construction unit, and an obtaining unit that obtains information related to the optical path length of the fiber. The obtaining unit includes a splitting unit that splits the pump or probe light before propagating through the fiber into first light and second light, a formation unit that forms interfering light, and an optical detection unit that detects an intensity of the interfering light. The waveform construction unit constructs a terahertz wave time waveform by extracting a detection result of the terahertz wave detection unit based on a detection result of the optical detection unit.

主权项

1. An information obtaining apparatus that irradiates a sample with a terahertz wave and obtains information of the sample, the information obtaining apparatus comprising:
a splitting unit that splits pulse light from a light source into pump light and probe light; a terahertz wave generation unit configured to generate a terahertz wave upon incidence of the pump light; a terahertz wave detection unit configured to detect the terahertz wave from the sample upon incidence of the probe light; a fiber through which the pump light or the probe light propagates; a changing unit configured to change an optical path length difference between an optical path length of the pump light and an optical path length of the probe light by changing an optical path length of the fiber; a waveform construction unit configured to construct a time waveform of the terahertz wave by using a detection result of the terahertz wave detection unit; and an obtaining unit configured to obtain information related to the optical path length of the fiber, wherein the obtaining unit includes a splitting unit that splits the pump light or the probe light before propagating through the fiber into first light and second light, a formation unit configured to form interfering light of the first light that has propagated through the fiber and the second light that has not propagated through the fiber, and an optical detection unit configured to detect an intensity of the interfering light as the information related to the optical path length of the fiber, and wherein the waveform construction unit constructs the time waveform of the terahertz wave by extracting the detection result of the terahertz wave detection unit based on a detection result of the optical detection unit.