Jeong, Y. U.
(Young Uk Jeong)

THBOS03 THz Imaging by a Wide-band Compact FEL
Young Uk Jeong, Hyuk Jin Cha, Byung Cheol Lee, Seong Hee Park (KAERI, Daejon), Grigori M. Kazakevitch (BINP, Novosibirsk)

We have developed a laboratory-scale users facility with a compact THz FEL. The FEL operates in the wide wavelength range of 100–1200 μm, which corresponds to 0.3-3 THz. THz radiation from the FEL shows well collimated Gaussian spatial distribution and narrow spectral width of 0.3 μm, which is Fourier transform limited by the estimated pulse duration of 20 ps. The main application of the FEL is THz imaging for bio-medical researches. We are developing THz imaging techniques by 2-D scanning, single pulse capturing with the electro-optic method, and 3-D holography. High power, coherent, and pulsed feature of the FEL radiation is expected to show much better performance in advanced THz imaging of 3-D tomography by comparing with incoherent and weak THz sources. By controlling the optical delay between reference beam and scattered light from an object, we can get its 3-D tomography by the holograms. The coherent and pulse length of the FEL beam is measured to be 3-6 mm. In this paper we will show and discuss the main results of THz imaging with the different methods by using the KAERI compact FEL.