期刊
OPTICS LETTERS
卷 45, 期 1, 页码 161-164出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.45.000161
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资金
- National Natural Science Foundation of China [61306072, 61605106, 61675129, 61704082]
- Natural Science Foundation of Shanghai [19ZR1427100]
- Natural Science Foundation of Shandong Province [ZR2019MF061]
- Science and Technology Project for the Universities of Shandong Province [J17KA180]
- Funded projects for the Academic Leader and Academic Backbones, Shaanxi Normal University [18QNGG006]
- Starting Grants of Shaanxi Normal University [1110010717, 1112010209]
- Fundamental Research Funds for the Central Universities [GK201802006]
Owing to its unique electronic and optical properties, lead sulfide (PbS) has stimulated great interest in various areas including ultrafast optics. Here, solution-processed PbS nanoparticles (NPs) deposited on a gold mirror are used as the saturable absorber (SA) to modulate a 2 mu m Tm-doped fiber laser for ultrafast pulse generation. The PbS NPs have a broadband linear absorption decreasing from 350-2400 nm, with an absorption coefficient of >20% at 2 mu m. Nonlinear optical absorption of the PbS NPs SA at 2 mu m provides a modulation depth of 8.8% and a saturable intensity of 0.8 MW/cm(2). A Tm-doped fiber laser mode-locked with the PbS NPs SA gives a maximum pulse energy of 7.3 nJ, pulse width of 4.24 ps, spectral width of 2.5 nm at similar to 1993 nm. The damage threshold as high as 24 GW/cm(2) together with large modulation depth, low saturation intensity, and long-term stability make solution-based PbS NPs excellent candidates as light modulators in the 2 mu m spectral region and beyond. (C) 2019 Optical Society of America
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