Output energy enhancement in a dual-wavelength Q-switched fiber laser based on a ternary MoWSe2 saturable absorber

Abstract

• The optical modulation property of ternary transition metal sulfide-MoWSe 2 was investigated. • Stable Q-switched fiber laser with the maximum single pulse energy and peak power of 151.4 nJ and 98.91 W was obtained using MoWSe 2 as a saturable absorber. • Dual-wavelength output was achieved with the pump power increased from the Q-switched laser threshold to the maximum. As a novel ternary selenide-based transition metal dichalcogenide (TMD), few-layered molybdenum tungsten selenide (MoWSe 2 ) was fabricated using liquid phase exfoliation method and applied in a Q-switched fiber laser as a saturable absorber. Dual-wavelength operation was achieved with the increase of pumping strength. The shortest pulse width and the maximum repetition rate were monitored to be 1.53 μs and 85.71 kHz, corresponding to a maximum single pulse energy and peak power of 151.4 nJ and 98.91 mW, respectively. The results indicate ternary MoWSe 2 could be a promising candidate in Q-switched laser applications.