Feng Tianxian, Mao Dong, Cui Xiaoqi, Li Mingkun, Song Kun, Jiang Biqiang, Lu Hua, Quan Wangmin
MOE Key Laboratory of Space Applied Physics and Chemistry, Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi'an 710072, China.
Materials (Basel). 2016 Nov 11;9(11):917. doi: 10.3390/ma9110917.
We demonstrate an erbium-doped fiber laser passively Q-switched by a black-phosphorus polyimide film. The multi-layer black-phosphorus (BP) nanosheets were prepared via a liquid exfoliation approach exploiting -methylpyrrolidone as the dispersion liquid. By mixing the BP nanosheets with polyimide (PI), a piece of BP-PI film was obtained after evaporating the mixture in a petri dish. The BP-PI saturable absorber had a modulation depth of 0.47% and was inserted into an erbium-doped fiber laser to realize passive Q-switched operations. The repetition rate of the Q-switched laser increased from 5.73 kHz to 31.07 kHz when the laser pump was enhanced from 31.78 mW to 231.46 mW. Our results show that PI is an excellent host material to protect BP from oxidation, and the BP-PI film can act as a promising nonlinear optical device for laser applications.
我们展示了一种由黑磷聚酰亚胺薄膜被动调Q的掺铒光纤激光器。通过以N-甲基吡咯烷酮为分散液的液相剥离法制备了多层黑磷（BP）纳米片。将BP纳米片与聚酰亚胺（PI）混合，在培养皿中蒸发混合物后得到一片BP-PI薄膜。该BP-PI饱和吸收体的调制深度为0.47%，将其插入掺铒光纤激光器中以实现被动调Q运转。当激光泵浦功率从31.78 mW提高到231.46 mW时，调Q激光器的重复频率从5.73 kHz增加到31.07 kHz。我们的结果表明，PI是保护BP不被氧化的优良主体材料，并且BP-PI薄膜可作为一种有前景的用于激光应用的非线性光学器件。
