Journal
ADVANCED MATERIALS
Volume 30, Issue 31, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201801021
Keywords
Bi2O2Se; mid-infrared; nonlinear optical; Q-switching; saturable absorption
Categories
Funding
- National Key R&D Program of China [YS2018YFB110012]
- National Natural Science Foundation of China [51472091, 51772270, 61722503, 61435003]
- Guangdong Natural Science Foundation [S2011030001349]
- Fundamental Research Funds for the Central Universities [2013ZM0001]
- State Key Laboratory of High Field Laser Physics of Shanghai Institute of Optics and Fine Mechanics
- Chinese Academy of Science
- State Key Laboratory of Precision Spectroscopy of East China Normal University
- Natural Science Foundation of Zhejiang Province [LQ18A040004]
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology) [2018-skllmd-13]
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Pulsed lasers operating in the mid-infrared (3-25 mu m) are increasingly becoming the light source of choice for a wide range of industrial and scientific applications such as spectroscopy, biomedical research, sensing, imaging, and communication. Up to now, one of the factors limiting the mid-infrared pulsed lasers is the lack of optical switch with a capability of pulse generation, especially for those with wideband response. Here, a semiconductor material of bismuth oxyselenide (Bi2O2Se) with a facile processibility, constituting an ultrabroadband saturable absorber for the mid-infrared (actually from the near-infrared to mid-infrared: 0.8-5.0 mu m) is exhibited. Significantly, it is found that the optical response is associated with a strong nonlinear character, showing picosecond response time and response amplitude up to approximate to 330.1% at 5.0 mu m. Combined with facile processibility and low cost, these solution-processed Bi2O2Se materials may offer a scalable and printable mid-infrared optical switch to open up the long-sought parameter space which is crucial for the exploitation of compact and high-performance mid-infrared pulsed laser sources.
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