TIME-RESOLVED SPECTROMETER FOR TERAHERTZ ELECTROMAGNETIC WAVE

PROBLEM TO BE SOLVED: To provide a time-resolved spectrometer for terahertz (THz) electromagnetic waves enabling so-far impossible time-resolved measurement in saturation spectroscopy by amplifying THz pulse waves projected upon or emitted by a specimen for improvement on the signal/noise ratio. SOL...

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Bibliographische Detailangaben
Hauptverfasser:	TANI MASAHIKO, WATANABE MASAYOSHI, HIROMOTO YOSHIHISA, SAKAI KIYOMI, HOSAKO IWAO
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS COLORIMETRY DEVICES USING STIMULATED EMISSION ELECTRICITY INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT MEASURING PHYSICS RADIATION PYROMETRY TESTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a time-resolved spectrometer for terahertz (THz) electromagnetic waves enabling so-far impossible time-resolved measurement in saturation spectroscopy by amplifying THz pulse waves projected upon or emitted by a specimen for improvement on the signal/noise ratio. SOLUTION: The spectrometer comprises a pulse laser source, means for branching the laser beam, means for delaying the beam in one of branched optical paths, means for generating THz pulse waves in synchronization with the beam in the branched or delayed 1st path, means for amplifying the thus- generated pulse waves, means for controlling amplitude in the means for amplification, arrangement for projecting the pulse waves on the specimen, means for combining the light in the branched or delayed 2nd path and the light emitted by the specimen, and a means for converting the combined light into electric signals.