A solid-state green-light-emitting upconversion coherent random laser was realized by pumping macroporous erbium-doped lithium niobate with a 980 nm laser. The lasing threshold was determined to be about 40 k W∕cm~2....A solid-state green-light-emitting upconversion coherent random laser was realized by pumping macroporous erbium-doped lithium niobate with a 980 nm laser. The lasing threshold was determined to be about 40 k W∕cm~2.Above the threshold, the emission intensity increased sharply with the increasing pump intensity. Moreover, a narrow multi-peaks structure was observed in the green-light-emission band, and the positions of lasing lines were various at different angles. The results were the direct evidences of coherent random lasing emission from macroporous erbium-doped lithium niobate. These phenomena were attributed to the coexistence of upconversion emission and a multiple scattering feedback mechanism.展开更多
If students from China and Denmark were tested in reading, math, English, innovation and cooperation, in which aspects do you think Chinese students would win or lose？ Many people would probably doubt Chinese student...If students from China and Denmark were tested in reading, math, English, innovation and cooperation, in which aspects do you think Chinese students would win or lose？ Many people would probably doubt Chinese students＂ innovation and cooperation capabilities.展开更多
基金supported by the National Natural Science Foundation of China under Grant Nos. U1509207, 61325019, and 61703304
文摘A solid-state green-light-emitting upconversion coherent random laser was realized by pumping macroporous erbium-doped lithium niobate with a 980 nm laser. The lasing threshold was determined to be about 40 k W∕cm~2.Above the threshold, the emission intensity increased sharply with the increasing pump intensity. Moreover, a narrow multi-peaks structure was observed in the green-light-emission band, and the positions of lasing lines were various at different angles. The results were the direct evidences of coherent random lasing emission from macroporous erbium-doped lithium niobate. These phenomena were attributed to the coexistence of upconversion emission and a multiple scattering feedback mechanism.
文摘If students from China and Denmark were tested in reading, math, English, innovation and cooperation, in which aspects do you think Chinese students would win or lose？ Many people would probably doubt Chinese students＂ innovation and cooperation capabilities.
