We have achieved a dual-frequency passively Q-switched Yb 3+ :GdAl 3 (BO 3 ) 4 solid-state laser at 1042.6 and 1045.0 nm, in which suppressing wavelength time-jittering and building Q-switched pulses both took advantage of the nonlinear loss of black phosphorus prepared by liquid phase exfoliation. It shows the good frequency stabilization effect of a black phosphorus (BP) saturable absorber. A 355 ns pulse laser with pulse energy of 0.889 µJ was achieved. This work validates the capability of BP to convert nonstable multi-wavelength emission into certain stable multi-wavelength emission owing to its nonlinear absorption. Many other multiwavelength lasers will rely on such a modulation performance.
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