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
Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong SAR, China.
School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai, 519082, China.
Nat Commun. 2022 Feb 24;13(1):1032. doi: 10.1038/s41467-022-28701-1.
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 (~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.
相干紫外光在环境和生命科学应用中很重要。然而，直接紫外激光受到制造挑战和运营成本的限制。在此，我们提出了一种通过串联上转换过程间接产生深紫外激光的策略。开发了一种核壳壳纳米粒子，通过在1550 nm的电信波长范围内激发，实现了290 nm的深紫外发射。1260 nm（约3.5 eV）的超大反斯托克斯位移源于集成到核壳壳结构不同层中的不同上转换过程的串联组合。通过将核壳壳纳米粒子作为增益介质纳入环形微腔，通过在1550 nm处泵浦实现了289.2 nm的单模激光发射。由于成熟的电信行业中各种光学组件 readily available，我们的研究结果为构建适用于器件应用的小型化短波长激光器提供了可行的解决方案。
