Abstract
In this work, ferroferric-oxide (Fe3O4) nanoparticles (FONPs) were used as saturable absorber (SA) for passively mode-locked solid-state lasers (SSLs). Based on the interaction between laser and FONPs, a continuous mode-locked operation was achieved. Results showed that FONPs had a large nonlinear saturated absorption property at 1μm. We obtained a mode-locked operation with a pulse duration of 463 ps at 125 MHz repetition rate using this novel SA. The maximum average output power, single pulse energy, and peak power of mode-locked laser were 856 mW, 6.85 nJ, and 14.79 W, respectively. To the best of our knowledge, this study is the first to achieve a passively mode-locked SSL operation with FONPs as the SA.
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