Speckle pattern of the images of objects exposed to monochromatic coherent terahertz radiation

By using a free electron laser and a microbolometer array, real-time images are recorded for the first time in the terahertz range at the rate of up to 90 frames per second. In the case of diffusive illumination of objects by coherent monochromatic radiation, the images consist of speckles. The stud...

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Bibliographic Details
Published in:Quantum electronics (Woodbury, N.Y.) N.Y.), 2009-05, Vol.39 (5), p.481-486
Main Authors: Vinokurov, Nikolai A, Dem'yanenko, M A, Esaev, D G, Knyazev, Boris A, Kulipanov, Gennadii N, Chashchina, O I, Cherkasskii, Valerii S
Format: Article
Language:English
Subjects:
BOLOMETERS
ELECTROMAGNETIC RADIATION
FREE ELECTRON LASERS
FREQUENCY RANGE
ILLUMINANCE
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
INTERFEROMETRY
LASERS
MEASURING INSTRUMENTS
MONOCHROMATIC RADIATION
PHOTOGRAPHY
RADIATIONS
THZ RANGE
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Summary:By using a free electron laser and a microbolometer array, real-time images are recorded for the first time in the terahertz range at the rate of up to 90 frames per second. In the case of diffusive illumination of objects by coherent monochromatic radiation, the images consist of speckles. The study of the statistical properties of speckle patterns shows that they are quite accurately described by the theory developed for speckles in the visible range. By averaging a set of images with the help of a rotating scatterer during the exposure time of a frame (20 ms) and by summing statistically independent speckle patterns of many frames, images of the acceptable quality are obtained. The possibilities of terahertz speckle photography and speckle interferometry are discussed. (terahertz radiation)
ISSN:1063-7818
1468-4799
DOI:10.1070/QE2009v039n05ABEH013950