Stochastic interference of partially coherent light multiple scattered by a random medium is considered. The relationship between the second- and third-order moments of intensity fluctuations in random interference patterns, the coherence function of probe radiation, and the probability density of path differences for the interfering partial waves in the medium are established. The obtained relationships were verified using the statistical analysis of spectrally selected fluorescence radiation emitted by the laser-pumped dye-doped random medium. Rhodamine 6G water solution was applied as the doping agent for the ensembles of densely packed silica grains which were pumped by the CW radiation (532 nm) from the diode-pumped solid state laser. Experimentally observed abrupt decay of the second- and third-order moments of fluorescence intensity fluctuations for the wavelengths ranging from 620 nm to 680 nm is interpreted in terms of amplification of spontaneous emission at large dye concentrations. This paper discusses the new optical probe of random media defined as "the reference-free path length interferometry with the intensity moments analysis".

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Никишин Евгений Леонардович, кандидат физико-математических наук, доцент кафедры физики, Саратовский государственный технический университет имени Гагарина Ю. А., nikel-55@ yandex.ru Биофизика и медицинская физика Радиофизика, электроника, акустика Е. Л. Никишин и др. Метод визуализации пространственно-неоднородных акустических полей Научный отдел Научный отделfunctionality is carried out. Theoretical and experimental estimations of the resolution of the device as a whole are given. Conclusion:The advantage of using the visualization method based on acoustooptic interaction in a double Fourier transform system for observing micro-objects with high resolution is proved.

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