Stable passively Q-switched erbium-doped fiber laser based on CuCrO2 nanoparticles saturable absorber

We demonstrate metal oxides CuCrO2 exhibit considerable nonlinear saturable absorption property in the nearinfrared region, and fabricate typical saturable absorber (SA) by wrapping the CuCrO2 nanoparticles(NPs) into a sodium carboxymethylcellulose (NaCMC) film or polyimide (PI) film separately. These SA films could keep stable exposed to air condition for several months. In the CuCrO2 -NaCMC (CuCrO2-PI) Q-switched fiber laser, the pulse repetition rate increases from 10.6 kHz (48.5 kHz) to 24.6 kHz (88.7 kHz) and the pulse duration decreases from 19.08 mu s (3.85 mu s) to 3.91 mu s (1.18 mu s) by adjusting the pump power from 53 mW (82.6 mW) to 188.6 mW (184.6 mW). The results suggest that CuCrO2 could be a promising SA for ultrafast lasers generation.