期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 10, 期 15, 页码 5956-5961出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1tc05746d
关键词
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资金
- HKSAR Research Grants Council (RGC) General Research Fund (GRF) [CUHK 14209421]
- Centre for Perceptual and Interactive Intelligence (CPII) Ltd under the Innovation and Technology Fund
Highly monodisperse and perfect crystalline PbS/CdS quantum dots with bright infrared fluorescence emissions have been synthesized and incorporated into a thin film as a saturable absorber, leading to stable Q-switched and mode-locked laser pulses.
PbS/CdS quantum dots (QDs) have attracted much attention for application in photonic devices owing to their excellent saturable absorption properties. Here, highly monodisperse and perfect crystalline PbS/CdS QDs with bright infrared fluorescence emissions have been successfully synthesized by a low-temperature shell growth approach. By incorporating the PbS/CdS QDs into a thin film, sandwiched between a fiber connector as the saturable absorber (SA), stable Q-switched and mode-locked laser pulses have been observed. In the Q-switching operation, the maximum single pulse energy is measured to be 142 nJ with a pulse width of 3.3 mu s and a repetition rate of 42.2 kHz, the best reported record for PbS/CdS-based SAs. With increasing pump power, we observe a stable mode-locked pulse train with a pulse width of 1.5 ps and a repetition rate of 24.2 MHz. These results prove that highly monodisperse PbS/CdS QDs prepared by low-temperature solution processes are a promising SA candidate to generate ultrafast laser pulses.
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