Vol. 15, issue 03, article # 7

pdf Danilov A. V., Donchenko V. A., Zemlyanov A. A., Zemlyanov D. A. Two-photon-excited luminescence in organic dye doped drops. // Atmospheric and oceanic optics. 2002. V. 15. No. 03. P. 226-229.
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Two-photon-excited luminescence (TPEL) in dye doped drops was studied at different ratios of the excitation beam diameter to the drop diameter. Luminescence of millimeter-sized drops of rhodamine 6G in dibutyl phthalate was excited by the focused IR laser radiation (wavelength of 1064 nm, pulse duration of 10 ns, pulse energy of 10 mJ). The spectral, time, and power characteristics of luminescence in a drop show that as some pump threshold is achieved, the spontaneous TPEL becomes a stimulated TPEL. It is shown that the power threshold for occurrence of the stimulated TPEL in drops is an order of magnitude lower than in a continuous medium (in a cell).