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Ultrahigh Quality Upconverted Single‐Mode Lasing in Cesium Lead Bromide Spherical Microcavity
Author(s) -
Tang Bing,
Sun Liaoxin,
Zheng Weihao,
Dong Hongxing,
Zhao Binbin,
Si Quanquan,
Wang Xiaoxia,
Jiang Xiongwei,
Pan Anlian,
Zhang Long
Publication year - 2018
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201800391
Subject(s) - lasing threshold , materials science , whispering gallery wave , optoelectronics , laser , photon upconversion , laser linewidth , gain switching , optical microcavity , optics , active laser medium , wavelength , purcell effect , whispering gallery , resonator , spontaneous emission , luminescence , physics , laser power scaling
The realization of ultrahigh quality upconverted single‐mode lasing in wavelength‐scale cavity is still a great challenge, because of limitation of microcavity quality, gain medium, and low spontaneous emission coupling efficiency β. In this work, it is demonstrated that inorganic cesium lead bromide (CsPbBr 3 ) perovskite spheres with size of ≈780 nm serve as a gain medium and whispering‐gallery cavity simultaneously for two‐photon excited single‐mode laser. Lasing mode with a very narrow linewidth (≈0.037 nm) is realized, corresponding to an ultrahigh Q factor ≈1.5 × 10 4 . Surprisingly, the lasing performance of such small microcavity is best among reported naturally formed semiconductor microcavities. Furthermore, room‐temperature single‐mode lasing at same wavelength can be obtained at any angle between −30° and 30°, showing the nearly uniform emission output of the spherical microcavity. This work paves a simple and straight way to obtain ultrahigh Q two‐photon excited single‐mode lasing in micro/nanostructures, holding great promise for practical applications in frequency upconversion, high sensitive sensing in nano‐optics.