激光阈值
材料科学
激光器
光学
光子学
波长
光电子学
物理
作者
Guoen Weng,Jiahe Yan,Shengjie Chen,Chunhu Zhao,Hanbing Zhang,Jun Tian,Yuejun Liu,Xiaobo Hu,Jiahua Tao,Shaoqiang Chen,Z. Q. Zhu,Hidefumi Akiyama,Junhao Chu
出处
期刊:Photonics Research
[The Optical Society]
日期:2020-12-23
卷期号:9 (1): 54-54
被引量:13
摘要
All-inorganic perovskite micro/nanolasers are emerging as a class of miniaturized coherent photonic sources for many potential applications, such as optical communication, computing, and imaging, owing to their ultracompact sizes, highly localized coherent output, and broadband wavelength tunability. However, to achieve single-mode laser emission in the microscale perovskite cavity is still challenging. Herein, we report unprecedented single-mode laser operations at room temperature in self-assembly CsPbX 3 microcavities over an ultrawide pumping wavelength range of 400–2300 nm, covering one- to five-photon absorption processes. The superior frequency down- and upconversion single-mode lasing manifests high multiphoton absorption efficiency and excellent optical gain from the electron–hole plasma state in the perovskite microcavities. Through direct compositional modulation, the wavelength of a single-mode CsPbX 3 microlaser can be continuously tuned from blue-violet to green (427–543 nm). The laser emission remains stable and robust after long-term high-intensity excitation for over 12 h (up to 4.3 × 10 7 excitation cycles) in the ambient atmosphere. Moreover, the pump-wavelength dependence of the threshold, as well as the detailed lasing dynamics such as the gain-switching and electron–hole plasma mechanisms, are systematically investigated to shed insight into the more fundamental issues of the lasing processes in CsPbX 3 perovskite microcavities.
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