All-laser-microprocessed waveguide Cr:ZnS laser

Abstract

We report the proof-of-concept of an operational laser active medium with a depressed cladding waveguide manufactured in the volume of a Cr2+:ZnS single-crystalline sample and antireflection microstructures fabricated on its facets exclusively by femtosecond laser processing techniques. This allowed us to achieve transmittance in a broad range from 2 to 8 µm, approaching a maximum of over 90% near 2.5 µm, and lasing at 2275 nm at the average output power of 20 mW for the absorbed pump power of 500 mW with the slope efficiency of 5.5 %. This demonstration opens up a route towards the industrial fabrication of compact integrable laser sources and sensors based on II-VI materials.

Enhancement of the photocatalytic activity of fabricated ZnS nanoparticles in the photodegradation of methylene blue

“…The synthesis method and applied precursors drastically affect the shape, crystallite phase, dimension, and particle size and finally determine the physical and chemical properties of nanoparticles. Various synthesis methods have been established to synthesize ZnS NPs including sol-gel [17], microemulsions [18], solvo-thermal [19], Co-precipitation [20], pyrolysis [21], laser ablation [22], hydrothermal [23], etc. Compared to other synthesis methods, the hydrothermal method possesses more preferences, high ability operation, controllable in fabrication, alterable, productive, uniformity of products, no need for calcination and further thermal operation, and low contamination [24].…”

Stabilization of spatiotemporal dissipative solitons in multimode fiber lasers by external phase modulation

“…Therefore, the soliton stabilization mechanism based on increasing the level of nonlinearity was called 'ST mode-locking' (STML), ultimately leading to LB or ST soliton generation [47]. This is a promising technique for the applications of MMF lasers [15] and mid-infrared waveguide lasers [49].…”