Measurement of coherent terahertz radiation for time-domain spectroscopy and imaging |
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Authors: | R Kuroda M Yasumoto N Sei H Toyokawa H Ikeura-Sekiguchi H Ogawa M Koike K Yamada |
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Institution: | aResearch Institute of Instrumentation Frontier, National Institute of Advanced Industrial Science and Technology (AIST), Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan |
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Abstract: | A high-power terahertz (THz) source for THz time-domain spectroscopy (THz-TDS) and THz imaging has been developed based on an S-band compact electron linac at the National Institute of Advanced Industrial Science and Technology (AIST). A THz pulse was generated as coherent synchrotron radiation (CSR) from an ultra-short electron bunch and expected to have peak power of kW-order with frequency range of 0.1–2 THz. The electro-optic (EO) sampling method with a ZnTe crystal for the THz pulse measurement has been prepared for THz-TDS system. The timing measurement between the THz pulse and a probe laser was carried out. A preliminary experiment of THz transmission imaging of an integrated circuit (IC) card has been successfully demonstrated using the THz CSR pulse and a W-band rf detector. The imaging result was experimentally compared with a result of X-ray imaging. It is confirmed that its intensity and stability are enough to perform for the THz applications. |
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Keywords: | Terahertz Time-domain spectroscopy THz-TDS THz imaging Linac Electron beam Laser |
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