Ultralarge anti-Stokes lasing through tandem upconversion

作者：Sun, Tianying; Chen, Bing; Guo, Yang; Zhu, Qi; Zhao, Jianxiong; Li, Yuhua; Chen, Xian; Wu, Yunkai; Gao, Yaobin; Jin, Limin^*; Chu, Sai Tak^*; Wang, Feng^*

来源：Nature Communications, 2022, 13(1): 1032.

DOI：10.1038/s41467-022-28701-1

• UPCONVERTING NANOPARTICLES
• ENERGY
• EMISSION
• SURFACE
• NANOCRYSTALS
• SPECTROSCOPY
• IONS

Coherent ultraviolet light is important for applications in environmental and life sciences. However, direct ultraviolet lasing is constrained by the fabrication challenge and operation cost. Herein, we present a strategy for the indirect generation of deep-ultraviolet lasing through a tandem upconversion process. A core-shell-shell nanoparticle is developed to achieve deep-ultraviolet emission at 290 nm by excitation in the telecommunication wavelength range at 1550 nm. The ultralarge anti-Stokes shift of 1260 nm (similar to 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 is realized by pumping at 1550 nm. As various optical components are readily available in the mature telecommunication industry, our findings provide a viable solution for constructing miniaturized short-wavelength lasers that are suitable for device applications.

• 单位
  中山大学