《Table 1.Different Pulsed Lasers Modulated by a g-C3N4SA》

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《Er-doped all-fiber laser mode-locked by graphitic carbon nitride nanosheets》

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Driven by the excellent performances，it is intriguing to seek novel 2D materials as SAs.Very recently，several kinds of novel 2D materials have been successfully drawn into the passively mode-locked fiber lasers as SAs.One of them is perovskite nanocrystal.In 2016，an SA made of cesium lead halide perovskite nanocrystals（Cs Pb X3，X?Cl，Br，I）was used in a passively mode-locked ytterbium-doped（Yb-doped）fiber laser[14].In 2017，based on hybrid organic-inorganic perovskite（CH3NH3Pb I3）nanosheets at the wavelength of 1μm，the Q-switched[15]and mode-locked[16]fiber lasers were，respectively，achieved.Another novel 2D material is graphitic carbon nitride（g-C3N4）.In 2016，nonlinear optical effects of 2D-like C–N polymer nanosheets were investigated，and the2D-like CN polymer was firstly used as an SA in an allnormal dispersion Yb-doped mode-locked fiber laser at1.06μm[17].In 2017，SAs based on g-C3N4nanosheets attracted more attention，with which a Q-switched Nd:Lu Li F4solid laser，a Q-switched Er:Lu2O3solid laser，and a Q-switched Ho，Pr:LLF solid laser were demonstrated at 1.3，2.84，and 2.95μm，respectively[18–20].For convenience of comparison，Table 1 gives a summary of pulsed lasers using g-C3N4as SAs for optical modulators.The results illustrate that the g-C3N4is a broadband optical SA，and the g-C3N4SA modulation depth can vary from 3.3%to 13.6%.