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It attracts wide interest to seek universe saturable absorber coveringwavelengths from near infrared to mid-infrared band. Multilayer blackphosphorus, with variable direct bandgap (0.3-2 eV) depending on the layernumber, becomes a good alternative as a universe saturable absorber for pulsedlasers. In this contribution, we first experimentally demonstrated broadbandsaturable absorption of multilayer black phosphorus from 1 {\mu}m to 2.7 {\mu}mwavelength. With the as-fabricated black phosphorus nanoflakes as saturableabsorber, stable Q-switching operation of bulk lasers at 1.03 {\mu}m, 1.93{\mu}m, 2.72 {\mu}m were realized, respectively. In contrast with large-bandgapsemiconducting transition metal dichalcogenides, such as MoS2, MoSe2,multilayer black phosphorus shows particular advantage at the long wavelengthregime thanks to its narrow direct bandgap. This work will open promisingoptoelectronic applications of black phosphorus in mid-infrared spectral regionand further demonstrate that BP may fill the gap of between zero-bandgapgraphene and large-bandgap TMDs.

Multilayer black phosphorus as broadband saturable absorber for pulsed lasers from 1 to 2.7 {\mu}m wavelength