Mr. Stanislav Narivonchik Profile

Stanislav Narivonchik

at State Inst of Fine Mechn & Opt

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Proceedings Article | 14 January 2002 Paper

Backscattering of ultrashort laser pulse in turbid media

Stanislav Narivonchik, Victor Bespalov

Proceedings Volume 4544, (2002) https://doi.org/10.1117/12.452758

KEYWORDS: Photons, Laser scattering, Scattering, Pulsed laser operation, Sensors, Backscatter, Ultrafast phenomena, Particles, Signal detection, Solids

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Recently there has been considerable interest in the problems of optical imaging in turbid, strongly scattering media, such as tumours in biological tissues, objects in water, etc. To detect objects in the media the analysis of backscattering of picosecond signal can be used. In this paper we report about the influence of medium parameters and detector parameters on temporal profile of the reflected pulse and its intensity. Virtual experiments were carried out with the MONTE-CARLO method, and temporal profile of signal was obtained. The dependencies of the forepart and tail-part of the signal fronts, maximum position of the reflected signal and the reflection coefficient from the scattering particle density and cross section were obtained. These dependencies show that the tail-part of the signal is greatly decreased while the density is increased, compared to the forepart and maximum intensity position of the signal. These results can be used to analyze the scattering particle density and cross section in the turbid materials. Virtual experiments with the presence of various inhomogeneities were performed, which show that not only reflecting and absorbing solid objects, but also even density inhomogeneities can be detected.

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