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Raman spectra of rGO and GO (inset) recorded with 1 mW of 514 nm wavelength laser line.
Setup of the Q-switched fiber laser. PM-FWDM—polarization maintaining filter-WDM coupler and rGO-SA—reduced graphene oxide saturable absorber.
Optical spectrum of the laser recorded with 0.05 nm resolution.
Pulse duration and the repetition frequency as a function of the pump power.
Recorded pulse train (a) and a single pulse (b) at 115 kHz repetition rate.
Pulse energy and average output power as a function of the pump power.
Degree of polarization measured over 1 min period at maximum pump power.
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