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

Journal Article · Sun May 31 04:00:00 EDT 2009 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE2009V039N05ABEH013950· OSTI ID:21467134

Vinokurov, Nikolai A; Knyazev, Boris A; Kulipanov, Gennadii N ^[1]; Dem'yanenko, M A; Esaev, D G ^[2]; Chashchina, O I; Cherkasskii, Valerii S ^[3]

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1. G.I. Budker Institute of Nuclear Physics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk (Russian Federation)
2. A.V.Rzhanov Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk (Russian Federation)
3. Novosibirsk State University, Novosibirsk (Russian Federation)

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)

• OSTI ID: 21467134
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Journal Name: Quantum Electronics (Woodbury, N.Y.) Journal Issue: 5 Vol. 39; ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BOLOMETERS
ELECTROMAGNETIC RADIATION
FREE ELECTRON LASERS
FREQUENCY RANGE
ILLUMINANCE
IMAGES
INTERFEROMETRY
LASERS
MEASURING INSTRUMENTS
MONOCHROMATIC RADIATION
PHOTOGRAPHY
RADIATIONS
THZ RANGE