GaSe saturable absorber for mode-locked Er-doped fiber laser.

Highlights • The GaSe saturable absorber is formed and characterized. • The mode-locked Er-doped fiber laser with GaSe saturable absorber is demonstrated. • A GaSe-PVA based saturable absorber (SA) is prepared by liquid-phase stripping method. Abstract A GaSe-PVA based saturable absorber (SA) is prepared by liquid-phase stripping method. The linear and nonlinear transmission spectrum, AFM, SEM and Raman spectrum are used to characterize the SA, the modulation depth of 6.4% and the saturation intensity of 72 MW/cm2 indicated that the GaSe nanosheets can be employed as SA for mode-locked (ML) operation in Er-doped fiber laser (EDFL). The passively mode-locked operation with the output power of 29.1 mW, pulse width of 4.3 ps and repetition rate of 8.849 MHz can be obtained by GaSe-PVA based SA. [ABSTRACT FROM AUTHOR]