A. Ayt, V. A. Barachevsky, O. I. Kobeleva, T. Valova, S. Gagarskiy, V. Kiyko, A. N. Sergeev, A. Veniaminov, V. Zakharov, M. Krayushkin, H. Iglev
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Two-photon recording of stable luminescent centers in chromone-doped polymer films
The study defines threshold values of energy density required for two-photon writing of stable fluorescent bit patterns within polymer layers containing chromones class chemical compounds by visual laser pulses in range of pulse widths from nanoseconds to femtoseconds. Photo-regrouping of non-luminescent chromones to fluorescent products is shown as the result of true type two-photon absorption (TPA) and stepwise TPA as well. In the latter case writing beam fluence can be reduced due to increase of the effective TPA coefficient, but laser-induced thermal damage of matrix becomes more probable too.
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