Abstract

A dual-wavelength passively $Q$-switched Nd:GYSGG laser using vacuum evaporating tungsten disulfide (${\mathrm{WS}}_2$) as a saturable absorber was demonstrated for the first time to the best of our knowledge. The ${\mathrm{WS}}_2$ saturable absorber was prepared simply by evaporating nanometer ${\mathrm{WS}}_2$ powders onto a quartz substrate in a vacuum. By inserting the ${\mathrm{WS}}_2$ saturable absorber into the laser cavity, stable $Q$-switched laser operation was achieved with a maximum average output power of 367 mW, a pulse repetition rate of 70.7 kHz, the shortest pulse width of 591 ns, and pulse energy of about 1.05 μJ. By vacuum evaporation method, a high-quality ${\mathrm{WS}}_2$ saturable absorber can be produced, and it seems to be a suitable method for fabrication of 2D transition metal dichalcogenides.

© 2016 Optical Society of America

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