Generating ultra-violet lasers with near-infrared light through ‘domino upconversion’ of nanoparticles

Phys.org  May 19, 2022
Direct ultraviolet lasing is constrained by the fabrication challenge and operation cost. Researchers in China have developed a strategy for the indirect generation of deep-ultraviolet lasing through a tandem upconversion process. They developed a core–shell–shell nanoparticle to achieve deep-ultraviolet emission at 290 nm by excitation in the telecommunication wavelength range at 1550 nm. The ultra large anti-Stokes shift of 1260 nm (~3.5 eV) stems from a tandem combination of distinct upconversion processes that are integrated into separate layers of the core–shell–shell structure. By incorporating the core–shell–shell nanoparticles as gain media into a toroid microcavity, single-mode lasing at 289.2 nm was realized by pumping at 1550 nm. According to the researchers their findings provide a viable solution for constructing miniaturized short-wavelength lasers that are suitable for device applications…read more. Open Access TECHNICAL ARTICLE 

Ultra large anti-Stokes emission through DU in core–shell–shell nanoparticles. Credit: Nature Communications volume 13, Article number: 1032 (2022)