Details

Autor(en) / Beteiligte

• Yang, Song
• Li, Fei
• Gong, Man-Man
• Zhang, Ling
• Zhu, Zhi-Wei
• Shen, Huai-Bin
• Chen, Shih-Chi

Titel

Generation of Q-switched and mode-locked pulses based on PbS/CdS saturable absorbers in an Er-doped fiber laser

Ist Teil von

• Journal of materials chemistry. C, Materials for optical and electronic devices, 2022-04, Vol.1 (15), p.5956-5961

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2022

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 μs 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. We have synthesized highly monodisperse PbS/CdS quantum dots with bright infrared emissions via a low-temperature shell growth approach. Stable Q-switched and mode-locked ultrashort pulses are generated based on PbS/CdS saturable absorbers.