Abstract
A dual-wavelength passively -switched Nd:GYSGG laser using vacuum evaporating tungsten disulfide () as a saturable absorber was demonstrated for the first time to the best of our knowledge. The saturable absorber was prepared simply by evaporating nanometer powders onto a quartz substrate in a vacuum. By inserting the saturable absorber into the laser cavity, stable -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 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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