Title :
Fresnel optics and optical systems for terahertz imaging at free electron lasers
Author :
Cherkassky, V.S. ; Fanova, A.V. ; Gavrilov, N.G. ; Jeong, Young Uk ; Cha, Hyuk Jin ; Knyazev, B.A. ; Kulipanov, G.N. ; Merzhievsky, L.A. ; Polskikh, I.A. ; Vinokurov, N.A. ; Zhigach, S.A.
Author_Institution :
Novosibirsk State Univ., Novosibirsk
Abstract :
We have developed reflective diffraction optical elements (DOE) for focusing radiation of terahertz free electron lasers (FEL). Metal-dielectric Fresnel zone plates and metallic kinoform "lens" for focusing radiation at the right angle were fabricated and tested using FEL radiation. Diffraction efficiency of the kinoform lens appears to be about unity. Quality of images obtained with the kinoform lens was studied. The lens was used as a key element for a Toepler optical system, which were used for studying condense matter non-uniformities and deformations. The experiments were performed at Novosibirsk and KAERI FELs.
Keywords :
Fresnel diffraction; electron lenses; free electron lasers; optical elements; submillimetre wave imaging; Fresnel optics; KAERI FEL; Novosibirsk; Toepler optical system; diffraction optical elements; free electron lasers; metal dielectric Fresnel zone plates; metallic kinoform ens; optical systems; terahertz imaging; Biomedical optical imaging; Electron optics; Free electron lasers; Fresnel reflection; Lenses; Optical imaging; Optical interferometry; Optical recording; Optical refraction; Optical sensors; Fresnel zone plates; Toepler optical system; diffractive optical elements; kinoform “lens”; terahertz radiation;
Conference_Titel :
Infrared and Millimeter Waves, 2007 and the 2007 15th International Conference on Terahertz Electronics. IRMMW-THz. Joint 32nd International Conference on
Conference_Location :
Cardiff
Print_ISBN :
978-1-4244-1438-3
DOI :
10.1109/ICIMW.2007.4516603
