TiS2,MoS2,WS2/Sb2Te3 mixed nanosheets saturable absorber for dual-wavelength passively Q-switched Nd:GYSGG Laser

We demonstrate the mixed antimony telluride-molybdenum disulfide/tungsten disulfide/titanium disulfide as saturable absorber for efficient passively Q-switching of Nd:GYSGG laser. Sb2Te3-MoS2, Sb2Te3 WS2 and Sb2Te3-TiS2 dispersions with large populations of few layers were prepared by liquid-phase exfoliation. At the pump power of 5 W, dual-wavelength Q-switched operation were obtained with the output power of 0.46W, 0.42 W and 0.35W by using the mixed Sb2Te3-TiS2, Sb-2 Te-3-WS2 and Sb2Te3 MoS2 SAs. The minimum pulse width was 254 ns with a pulse repetition rate of 72.4 kHz was obtained by using the Sb2Te3-MoS2 SA. Obviously, all the mixed saturable absorber shows better SA response. It also allows to generate laser pulse at two different wavelengths simultaneously. (C) 2018 Elsevier B.V. All rights reserved.