激光阈值
材料科学
光电子学
激光器
带宽(计算)
钙钛矿(结构)
有源激光介质
光学
半导体
光子学
卤化物
光抽运
增益开关
激光功率缩放
物理
波长
电信
计算机科学
工程类
无机化学
化学
化学工程
作者
Kwangdong Roh,Lianfeng Zhao,Barry P. Rand
出处
期刊:ACS Photonics
[American Chemical Society]
日期:2021-08-09
卷期号:8 (8): 2548-2554
被引量:15
标识
DOI:10.1021/acsphotonics.1c00910
摘要
Metal halide perovskite semiconductors show considerable promise as an efficient coherent light source, but the extent of their spectral tunability and optical gain bandwidth have not been established. Here, we demonstrate continuously tunable single-mode lasing from halide perovskite thin films over a wide spectral range (758–804 nm for CH3NH3PbI3, 653–684 nm for Cs0.4(CH3NH3)0.6Pb(Br0.4I0.6)3, and 520–542 nm for CsPbBr3) at room temperature for the first time. The large optical gain bandwidth (∼90 meV) and high modal gain coefficient (533 cm–1) are key enabling factors for this achievement. Period-varying chirped Bragg gratings utilized for optical feedback allow fine-tuning of the lasing output, with a minimum spectral tuning spacing, Δλlasing ∼ 1.4 nm. This precise tuning control allows us to obtain the lowest possible lasing threshold throughout the gain bandwidth, useful for designing highly efficient electrically pumped lasers.
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