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- Title
Ultrashort laser pulse doubling by metal-halide perovskite multiple quantum wells.
- Authors
Guo, Jia; Liu, Tanghao; Li, Mingjie; Liang, Chao; Wang, Kaiyang; Hong, Guo; Tang, Yuxin; Long, Guankui; Yu, Siu-Fung; Lee, Tae-Woo; Huang, Wei; Xing, Guichuan
- Abstract
Multiple ultrashort laser pulses are widely used in optical spectroscopy, optoelectronic manipulation, optical imaging and optical signal processing etc. The laser pulse multiplication, so far, is solely realized by using the optical setups or devices to modify the output laser pulse from the optical gain medium. The employment of these external techniques is because the gain medium itself is incapable of modifying or multiplying the generated laser pulse. Herein, with single femtosecond laser pulse excitation, we achieve the double-pulsed stimulated emission with pulse duration of around 40 ps and pulse interval of around 70 ps from metal-halide perovskite multiple quantum wells. These unique stimulated emissions originate from one fast vertical and the other slow lateral high-efficiency carrier funneling from low-dimensional to high-dimensional quantum wells. Furthermore, such gain medium surprisingly possesses nearly Auger-free stimulated emission. These insights enable us a fresh approach to multiple the ultrashort laser pulse by gain medium. Laser pulse multiplication is desired in many applications but has been challenging to realize by gain medium. Here Guo et al. achieve double-pulsed stimulated emission in quasi-2D metal-halide perovskites due to the two-channel carrier funneling effect in their multiple-quantum-wells structure.
- Subjects
ULTRASHORT laser pulses; QUANTUM wells; ACTIVE medium; STIMULATED emission; FEMTOSECOND pulses; LASER pulses; ULTRA-short pulsed lasers; SEMICONDUCTOR lasers
- Publication
Nature Communications, 2020, Vol 11, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-020-17096-6