Electric field vector detection method and electric field vector detection device
First Claim
1. An electric field vector detection method for detecting an electric field vector of a terahertz wave,wherein ultrashort pulsed light is used as probe light and an electro-optic crystal, where a (111) surface of an optical isotropic medium is cut out, is used as a terahertz wave detection element for detecting the terahertz wave, the method comprising:
- causing polarization of the probe light to be circular polarization;
allowing the probe light having circular polarization to enter the terahertz wave detection element and probing the terahertz wave;
modulating the probe light, having probed the terahertz wave, by a rotating analyzer and detecting the modulated probe light by a photodetector;
performing lock-in detection of a detection signal from the photodetector by a lock-in detector using a frequency based on a rotational frequency of the rotating analyzer as a reference signal; and
detecting an electric field vector of the terahertz wave based on a detection signal from the lock-in detector.
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Abstract
In this electric field vector detection method, an electro-optic crystal, where a (111) surface of an optical isotropic medium is cut out, is used as a terahertz wave detection element. The method includes: causing polarization of probe light of ultrashort pulsed light to be circular polarization; allowing the probe light having circular polarization to enter the terahertz wave detection element and probing the terahertz wave; modulating the probe light, having probed the terahertz wave, by a rotating analyzer and detecting the modulated probe light by a photodetector; performing lock-in detection of a detection signal from the photodetector by a lock-in detector using a frequency based on a rotational frequency of the rotating analyzer as a reference signal; and detecting an electric field vector of the terahertz wave based on a detection signal from the lock-in detector.
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Citations
10 Claims
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1. An electric field vector detection method for detecting an electric field vector of a terahertz wave,
wherein ultrashort pulsed light is used as probe light and an electro-optic crystal, where a (111) surface of an optical isotropic medium is cut out, is used as a terahertz wave detection element for detecting the terahertz wave, the method comprising: -
causing polarization of the probe light to be circular polarization; allowing the probe light having circular polarization to enter the terahertz wave detection element and probing the terahertz wave; modulating the probe light, having probed the terahertz wave, by a rotating analyzer and detecting the modulated probe light by a photodetector; performing lock-in detection of a detection signal from the photodetector by a lock-in detector using a frequency based on a rotational frequency of the rotating analyzer as a reference signal; and detecting an electric field vector of the terahertz wave based on a detection signal from the lock-in detector. - View Dependent Claims (2, 3, 4, 5)
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6. An electric field vector detection device for detecting an electric field vector of a terahertz wave, the device comprising:
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a polarization adjusting unit configured to cause polarization of probe light of ultrashort pulsed light to be circular polarization; a terahertz wave detection element including an electro-optic crystal, where a (111) surface of an optical isotropic medium is cut out; a rotating analyzer configured to modulate the probe light having probed the terahertz wave; a photodetector configured to detect the probe light having been modulated by the rotating analyzer; a lock-in detector configured to perform lock-in detection of a detection signal from the photodetector using a frequency based on a rotational frequency of the rotating analyzer as a reference signal; and an electric field vector detection unit configured to detect an electric field vector of the terahertz wave based on a detection signal from the lock-in detector. - View Dependent Claims (7, 8, 9, 10)
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Specification