High-Power Mode-Locked Fiber Laser Using Lead Sulfide Quantum Dots Saturable Absorber

The discovery of different types of nanomaterials including the one-dimensional and two-dimensional materials used as saturable absorbers (SAs) in the applications of ultrafast lasers in recent years increases the ultrafast laser design flexibility and boosts the laser performances. A major research...

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Bibliographic Details
Published in:Journal of lightwave technology 2022-12, Vol.40 (24), p.7901-7906
Main Authors: Yun, Ling, Ding, Chen, Ding, Yongqi, Han, Dongdong, Zhang, Jiayue, Cui, Han, Wang, Zhiqiang, Yu, Kehan
Format: Article
Language:English
Subjects:
Absorbers
Doped fibers
Erbium
Erbium-doped fiber lasers
Fiber lasers
Laser mode locking
Lasers
Lead compounds
Lead sulfide quantum dots
Lead sulfides
mode-locked fiber laser
modulation depth
Nanomaterials
optical damage threshold
Optical fibers
Power lasers
Quantum dot lasers
Quantum dots
saturable absorber
Two dimensional materials
Ultrafast lasers
Ultrafast optics
Yield point
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Summary:The discovery of different types of nanomaterials including the one-dimensional and two-dimensional materials used as saturable absorbers (SAs) in the applications of ultrafast lasers in recent years increases the ultrafast laser design flexibility and boosts the laser performances. A major research avenue is to explore the potential of nanomaterials for further enhancing the performances of ultrafast lasers in terms of pulse power. To this aim, in this study, using a hot-injection method and drop-coating technology, a fiber-based lead sulfide quantum dot (PbS QD) is synthesized, and its potential as a SA for the generation of higher-power pulses is demonstrated in an erbium-doped fiber laser (EDFL). Experimental results show that the optical damage threshold of the SA is greater than 152.6 mJ/cm 2 , and the modulation depth is up to 29.5%. The implementation of the PbS QD as a SA placed in an EDFL enables the laser to yield 2.84 ps ultrashort pulses with an average output power of 59.4 mW at a repetition rate of 6.97 MHz. To the best of our knowledge, it is the highest average output power obtained in ultrafast fiber lasers mode-locked by zero-dimensional QD materials. The results suggest the great potential of PbS QDs in the application that requires the generation of high-power pulses in ultrafast lasers.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2022.3206788