期刊
NANOTECHNOLOGY
卷 32, 期 17, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/abde61
关键词
upconversion micro; nanolasers; whispering-gallery-mode; two-photon absorption; single-mode lasing; CdS microplatelets
资金
- Fundamental Research Funds for the Central Universities [2 682 020CX09]
- Southwest Jiaotong University
Research achieved upconverted lasing from CdS microplatelets with low threshold and wavelength-tunable characteristics. Lasing threshold decreases with increasing cavity edge length, highlighting the potential of CdS microplatelets for developing lasers.
Upconversion micro/nanolasers are promising in fundamental physics research and practical applications. However, due to the limitation of gain medium and cavity quality, such lasers still suffer from a high lasing threshold (P-th). Herein, upconverted whispering-gallery-mode lasing by two-photon absorption is achieved from CdS microplatelets with single-mode emission and low threshold (similar to 1.2 mJ cm(-2)). The threshold is three times lower than the best reported value in previous CdS upconversion lasers. Moreover, wavelength-tunable upconverted single-mode lasing is demonstrated from 510.4 to 518.9 nm with narrow linewidths around 0.85 nm, which is further verified through numerical simulations. In addition, the size-dependent lasing behavior is realized from single-mode to multimode oscillation; the corresponding lasing threshold decreases with increasing cavity edge length (L), following a P-th proportional to 1/L-2 relationship. These results underscore the promise of CdS microplatelets for developing chip-level frequency upconversion lasers.
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