Abstract
We demonstrated a passively Q-switched visible Pr:YLF laser using the gold nanostars (GNSs) as the saturable absorber (SA). The nonlinear saturable absorption properties at 639nm were measured, and the modulation and saturable fluence were calculated to be 3% and 0.3 GW/cm2, respectively. With the GNSs SA, the efficient passively Q-switched lasers were obtained at 639nm and 721nm, respectively. The maximum output powers and shortest pulse widths were (256mW, 168ns) at 639nm and (238mW, 198ns) for 721nm. To the best of our knowledge, this is the first time there has been a visible bulk pulse laser using the GNSs as the SA. Our work indicates the GNSs could be excellent and promising optoelectronic devices in the visible domain.
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