14 July 2004 Studying of mass transfer processes and defectoscopy of paper porosity using femtosecond OCT
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Abstract
A procedure of inspection of femtosecond laser induced mass transfer processes has been suggested that is based on pump-probe Doppler tomography. In the experiments we used mode-locked Ti:sapphire laser with output power up to 150 mW.. In our experiments focused laser radiation induced on the surface of the target mass transfer processes (melting and convection). The Doppler shifted backscattered radiation was registered by heterodyne scheme based on Michelson interferometer. We have obtained information about depth and distribution of convection flows within melted paraffin bath with high spatial resolution (Dz~15mm). We propose optical heterodyning technique based on OCT for obtaining temporal distribution of backscattered photons from media irradiated by Cr:forsterite femtosecond laser. The temporal resolution is about 60 fs. The technique was used for sheet paper porosity diagnostics.
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Kirill P. Bestemyanov, Kirill P. Bestemyanov, Vyacheslav M. Gordienko, Vyacheslav M. Gordienko, Alexey N. Konovalov, Alexey N. Konovalov, A. A. Podshivalov, A. A. Podshivalov, } "Studying of mass transfer processes and defectoscopy of paper porosity using femtosecond OCT", Proc. SPIE 5475, Saratov Fall Meeting 2003: Coherent Optics of Ordered and Random Media IV, (14 July 2004); doi: 10.1117/12.568574; https://doi.org/10.1117/12.568574
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