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Scientists from the LOD work on a miniaturized photoacoustic cell. The volume of internal cavity for the cell is ~ 5 mm3. We have an experience how to design, manufacture, test and apply such cells. Despite the reduced sizes, the developed cells are comparable in the performance (that is, in the sensitivity) with respect to non-miniaturized ones. The minimal detectable absorption estimated from our experiment for the cells is better than ~ 10-8 cm-1 W Hz-1/2. Such a millimeter-sized cell powered by the minute commercially available laser source (for instance, a near-infrared distributed-feed-back laser diode or mid-infrared quantum cascade laser) with a typical output power of ~ 10 mW will allow to detect trace gases at a sensitivity level, which can be attained by the absorption spectroscopy techniques along the optical path longer than 10 km. See http://www.micepas.basnet.by/ for more details.
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A series of experiments on passing Bessel beams in scattering media has been conducted confirming the effect of reconstruction of a Bessel beam after shading by single obstacles. Thus, the detailed theoretical and experimental investigations have confirmed that the self-reconstruction of the structure is the basic property of the Bessel beams. This property constitute a physical basis of the concrete developments of various optical probes for the nondestructive testing and studying various scattering media. Bessel beam based laser probes are perspective in optical tomography, confocal microscopy, multi-photon fluorescence microscopy, imaging through scattering media et all. |
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Feasibility of highly accurate differentiation between malignant and benign tissue in prostatic specimen has been demonstrated by using combined Laser-Induced Fluorescence and Electrical Impedance measurements. |
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