Abstract
High-quality gold (Au) nanospheres (Au-NPs) with a diameter of 52nm were prepared by the seeded growth method. The mid-infrared (MIR) nonlinear saturable absorption properties were measured by a balanced twin-detector measurement technique. With the as-prepared Au-NPs saturable absorber (SA), an efficient passively Q-switched laser was realized at 2.95μm for the first time, to the best of our knowledge. Under an absorbed pump power of 4.0W, a maximum output power of 268mW was obtained with the shortest pulse width of 734ns and repetition rate of 91kHz, corresponding to the pulse energy up to 2.95μJ. The results indicate that Au-NPs are promising candidates as SAs for MIR laser pulse generation.
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