Optical characteristics of ZnxMg1−xO, ZnO:Al, and ZnO epilayers are investigated. At pulse laser pumping, stimulated emissions are observed in these epilayers. Among them, spectral blueshifts are dependent on the Mg substitution concentration, and the highest lasing photon energy of 3.51eV ever reported is observed in ZnO series materials. Furthermore, experimental results also show that by high concentration Mg substitution, a redshift of the electron-hole plasma stimulated emission is reduced and its efficiency does not decrease with the Mg substitution concentration. These results imply that the lasing frequency of ZnO series materials can be modified by substitution.
The experimental and theoretical results in this letter reveal that three-photon absorption effect can help light wave to form solitonlike filament; and a stable solitonlike filament is observed in solution with high quintic nonlinearity. This stable solitonlike filament makes pumping infrared laser be localized within the filament and reach high pumping density for a long distance. This high density pumping laser in the filament generates high efficiency lasing induced by three-photon absorption. This work is an approach to make practical application of high order nonlinear optical processes possible.
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