Abstract
We report an 1150-nm diode-pump passively -switched -doped ZBLAN fiber laser using topological insulator (TI): as the saturable absorber (SA). The TI: prepared using the cost-effective hydrothermal intercalation/exfoliation method was dropped onto a substrate to fabricate the free-space SA component. It has a low saturable peak intensity of and a high modulation depth of 51.3% measured at 2 μm. Inserting this component into a linear-cavity -doped ZBLAN fiber laser, stable -switched pulses at 2979.9 nm were obtained with the repetition rate of 81.96 kHz and pulse duration of 1.37 μs. The achieved maximum output power and pulse energy were 327.4 mW at a slope efficiency of 11.6% and 3.99 μJ, respectively, only limited by the available pump power. Our work reveals that the TIs are absolutely a class of promising and reliable SAs for pulse generation at 3-μm mid-infrared waveband.
© 2015 Optical Society of America
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