Frequency stabilization of a dual-frequency Yb3+:GdAl3(BO3)4 laser via nonlinear loss modulation in black phosphorus

Abstract

We have achieved a dual-frequency passively Q-switched Yb3+:GdAl3(BO3)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 multi-wavelength lasers will rely on such a modulation performance.