Abstract
A Q-switched Er:YAG solid-state laser at 1645nm based on black phosphorus (BP) saturable absorbers (SAs) was demonstrated firstly to our knowledge. The BP-SA was fabricated by drop-casting BP nanoplatelets dispersion on a YAG substrate and corresponding saturable absorption properties were characterized at 1.6μm. By employing as-prepared BP-SAs, stable Q-switched laser operations were achieved with a pulse width of 2.8μs and a repetition rate of 34kHz, corresponding to the average output power of 0.33W. The results verify that BP-SAs have great potential for pulsed 1.6μm lasers.
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