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Novosibirsk Free Electron Laser—Facility Description and Recent Experiments
Kulipanov, Gennady N.,Bagryanskaya, Elena G.,Chesnokov, Evgeniy N.,Choporova, Yulia Yu,Gerasimov, Vasily V.,Getmanov, Yaroslav V.,Kiselev, Sergey L.,Knyazev, Boris A.,Kubarev, Vitali V.,Peltek, Sergey IEEE 2015 IEEE transactions on terahertz science and technol Vol.5 No.5
<P>The design and operational characteristics of the Novosibirsk free electron laser facility are described. Selected experiments in the terahertz range carried out recently at the user stations are surveyed in brief.</P>
B.A. Knyazev,G.N. Kulipanov,N.A. Vinokurov 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.I
High-power free-electron lasers open new opportunities for imaging in the terahertz spectral range. On one hand, because of the high intensity of radiation, materials and optical elements are to be examined for their applicability in the new conditions. On the other hand, the high intensity of radiation enables development of new imaging techniques, impossible with low-power sources. In this paper, we give a short description of the Novosibirsk free-electron laser, generating tunable monochromatic radiation with a power of 400 W spanning the spectral range of 120 $\sim$ 240 $\mu$m, and briefly observe the first results obtained at four user stations. The results of examinations of the beamsplitters, the windows, the polarizers and other optical components by using intense terahertz radiation are presented. Three new imaging techniques based on the thermal effect of terahertz radiation are described. The focusing characteristics of reflective Fresnel zone plates fabricated for the terahertz spectral range are presented. The shadowgraphy of amino acids buried in pressed Teflon tablets is described as an example of imaging techniques. The prospects for terahertz quasi-optical systems, holography and tomography with high-power lasers are considered.