【摘 要】
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The carboxyl-functionalized graphene oxide (GO-COOH) is a kind of unique two-dimensional (2D) material and possesses excellent nonlinear saturable absorption pr
【机 构】
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School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710119, China“,”Schoo
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The carboxyl-functionalized graphene oxide (GO-COOH) is a kind of unique two-dimensional (2D) material and possesses excellent nonlinear saturable absorption property and high water-solubility.In this paper,we prepare saturable absorber (SA) device by depositing GO-COOH nanosheets aqueous solution on a D-shaped fiber.The modulation depth (MD) and saturable intensity of the SA are measured to be 9.6％ and 19 MW/cm2,respectively.By inserting the SA into the erbium-doped fiber (EDF) laser,a passively mode-locked EDF laser has been achieved with the spectrum center wavelength of 1562.76 nm.The pulse duration,repetition rate,and the signal-to-noise ratio (SNR) are 500 fs,14.79 MHz,and 80 dB,respectively.The maximum average output power is measured to be 3.85 mW.These results indicate that the GO-COOH nanosheets SA can be used as a promising mode locker for the generation of ultrashort pulses.
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