Abstract
Gold nanorods (GNRs) with an average aspect ratio of 15 were experimentally exploited as the 2μm saturable absorber in a laser diode pumped Tm:YAG laser for the first time, to the best of our knowledge. Q-switched pulses with a maximum average output power of 380mW, a minimum pulse width of 796ns, and a pulse repetition rate of 77kHz were achieved under the LD pump power of 6.2W. Our results indicate that GNRs with a large aspect ratio are promising saturable absorbers in the 2μm wavelength region.
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