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Imaging with a 90 frames/s microbolometer focal plane array and high-power terahertz free electron laser

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5 Author(s)
Demyanenko, M.A. ; Rzhanov Institute of Semiconductor Physics SB RAS, 630090 Novosibirsk, Russia ; Esaev, D.G. ; Knyazev, B.A. ; Kulipanov, G.N.
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An uncooled microbolometer focal plane array (FPA) has been developed and used for imaging of objects illuminated by monochromatic coherent radiation of a free electron laser tunable in the range of 1.25–2.5 THz. A sensitivity threshold of 1.3×10-3 W/cm2 was obtained for the FPA with a homemade absolute interferometric power meter. Videos up to 90 frames/s were recorded in both transmission and reflection/scattering modes. When objects were illuminated by laser radiation scattered by a rough metal surface, speckled images were observed. Good quality terahertz images were achieved through the fast rotation of the scatterer.

Published in:

Applied Physics Letters  (Volume:92 ,  Issue: 13 )