Low-threshold power limitation of optical radiation in crystals with sensitized anti-Stokes luminescence

Смирнов М.С., Овчинников О.В., Новиков П.В., Латышев А.Н., Ефимова М.А. Низкопороговое ограничение мощности оптического излучения в кристаллах с сенсибилизированной антистоксовой люминесценцией // Оптический журнал. 2009. Т. 76. № 11. С. 68–74.

Smirnov M.S., Ovchinnikov O.V., Novikov P.V., Latyshev A.N., Efimova M.A. Low-threshold power limitation of optical radiation in crystals with sensitized anti-Stokes luminescence [in Russian] // Opticheskii Zhurnal. 2009. V. 76. № 11. P. 68–74.

M. S. Smirnov, O. V. Ovchinnikov, P. V. Novikov, A. N. Latyshev, and M. A. Efimova, "Low-threshold power limitation of optical radiation in crystals with sensitized anti-Stokes luminescence," Journal of Optical Technology. 76 (11), 725-729 (2009). https://doi.org/10.1364/JOT.76.000725

This paper shows that it is possible in principle to implement low-threshold power limitation in ionic-covalent crystals with adsorbed metal-cluster-dye-molecule structures that possess sensitized anti-Stokes luminescence. The power-limitation effect for radiation with λ=660nm has been detected and investigated at a temperature of 77K for AgCl(I) nanocrystals 40-70nm in size with adsorbed dye molecules and few-atom clusters of silver, dispersed in a gelatine matrix. The effect was observed for radiation with a density of 1017-1019quant/cm2sec at a pulse width of 1ms. The Z-scanning technique was used to establish that the main limitation mechanism is self-focusing, which results from variation of the refractive index of the medium when the electron concentration on traps in the band gap of the nanocrystals varies.

The research was supported by the grant of RFBR (No. 06-02-96312-р-цчр_а).