Author(s): Yang, S (Yang, Song); Li, F (Li, Fei); Gong, MM (Gong, Man-Man); Zhang, L (Zhang, Ling); Zhu, ZW (Zhu, Zhi-Wei); Shen, HB (Shen, Huai-Bin); Chen, SC (Chen, Shih-Chi)

Source: JOURNAL OF MATERIALS CHEMISTRY C DOI: 10.1039/d1tc05746d Early Access Date: MAR 2022

Abstract: 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.

Accession Number: WOS:000771684000001

Author Identifiers:

Author        Web of Science ResearcherID        ORCID Number

Yang, Song                  0000-0003-4559-3308

huaibin, shen                  0000-0002-6425-0514

ISSN: 2050-7526

eISSN: 2050-7534

Full Text: https://pubs.rsc.org/en/content/articlelanding/2022/TC/D1TC05746D