Abstract
In this work, a Tungsten disulfide (WS2) reflective saturable absorber (SA) fabricated using the Langmuir–Blodgett technique was used in a solid state Nd:YVO4 laser operating at 1.34 µm. A Q-switched laser was constructed. The shortest pulse width was 409 ns with the repetition rate of 159 kHz, and the maximum output power was 338 mW. To the best of our knowledge, it is the first time that short laser pulses have been generated in a solid state laser at 1.34 µm using a reflective WS2 SA fabricated by the Langmuir–Blodgett method.
Highlights
Saturable absorbers (SA) have been used as a switching element to generate short pulses in passively Q-switched lasers
The results indicate that the WS2 can be fabricated by the Langmuir–Blodgett method and used as a Q-switch element in solid state lasers to generate short pulses at 1.34 μm
We could estimate the size of the particle of the WS2 films, it was about dozens of micron
Summary
Saturable absorbers (SA) have been used as a switching element to generate short pulses in passively Q-switched lasers. It is mainly represented by transition metal ions–doped bulk crystals like. The fabrication method of switching elements is very important and determines the performances of the Q-switching lasers. Two-dimensional materials have been widely used in laser applications [19,20,21,22,23] due to their simple structure and remarkable wide spectral band [24,25,26]. As a kind of 2D material, WS2 has been successfully developed to produce short pulses in lasers with various wavelengths such as 1.06 μm, 1.53 μm, 1.65 μm, and 3 μm [30,31,32,33,34]
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