Abstract
A Q-switched ytterbium-doped fiber laser (YDFL) is proposed and demonstrated using a newly developed
multi-walled carbon nanotubes polyethylene oxide (MWCNTs-PEO) film as a passive saturable absorber (SA). The
saturable absorber is prepared by mixing the MWCNTs homogeneous solution into a dilute PEO polymer solution
before it is left to dry at room temperature to produce thin film. Then the film is sandwiched between two
FC/PC fiber connectors and integrated into the laser cavity for Q-switching pulse generation. The laser
generates a stable pulse operating at wavelength of 1060.2 nm with a threshold pump power of 53.43 mW. The
YDFL generates a stable pulse train with repetition rates ranging from 7.92 to 24.27 kHz by varying 980-nm
pump power from 53.42 to 65.72 mW. At 59.55-mW pump power, the lowest pulse width and the highest pulse energy
are obtained at 12.18 ?s and 143.5 nJ, respectively.
© 2014 Chinese Optics Letters
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