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“Free-oxygen”: A promising functional unit for strengthening electron-phonon coupling effect

Fei Liang*



Laser typically starts from fluorescence and direct lasing outside the emission spectrum seems impossible to access for a long time. One recent research presents a multiphonon coupling strategy to break the limitation of inherent fluorescence and greatly extend lasing wavelengths. A crucial structural unit, “free-oxygen”-centered tetrahedron and their assembly dimensionalities in crystal structural for strengthening electron-phonon coupling interaction, is investigated and verified in experiments. This special structural motif opens up new perspectives for searching new rare-earth laser crystals with great possibilities.

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