Dynamics of light-induced absorption in BI/sub 12/TIO/sub 20/ crystals at two wavelengths

Dynamics of light-induced absorption in BI/sub 12/TIO/sub 20/ crystals at two wavelengths

We demonstrate experimentally that time evolution of light-induced absorption in Bi/sub 12/TiO/sub 20/ crystals exhibits complicated behavior at theirs sequential irradiation by incoherent light from two light-emitting diodes With the wavelengths of 660 and 525 mn. To interpret our results we propos...

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Hauptverfasser: Polyakova, L.E., Plinta, K.S., Mandel, A.E., Shandarov, S.M., Egorysheva, A.V., Kargin, Y.F.
Format: Tagungsbericht
Sprache:eng
Schlagworte:
Absorption
Bismuth
Collision mitigation
Crystals
Frequency
Laser beams
Laser modes
Optical scattering
Resonance light scattering
Semiconductor lasers
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Zusammenfassung:We demonstrate experimentally that time evolution of light-induced absorption in Bi/sub 12/TiO/sub 20/ crystals exhibits complicated behavior at theirs sequential irradiation by incoherent light from two light-emitting diodes With the wavelengths of 660 and 525 mn. To interpret our results we propose a novel two-center model of light-induced changes in absorption including into consideration the two level structure for each defect center and the in-center transitions between inherent levels. Comparison of the experimental results obtained in the frame of this model for Bi/sub 12/TiO/sub 20/ crystals with different stoichiometry leads us to the conclusion that the titanium vacancies may be considered as trap centers, which provide light-induced absorption.