Simple Design of Double-Layer Antireflection Coating for Er-Doped Glass Laser Application
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https://doi.org/10.15625/0868-3166/17137Keywords:
lasers; erbium-doped glass; antireflection coatings; thin films; refractive indexAbstract
In an Erbium-doped glass laser resonator, parasitic light oscillations (yielding a lowering of the output laser beam power) may be avoided by deposition of well-adapted antireflection coatings on the edges of the active glass medium. However, towards laser application, efficient double-layers are scarce in literature. Here, we propose a simple design of double-layer (total thickness < 490nm) composed of thin films of MgF2 and Al2O3, materials that are easy to deposit by electron beam evaporation. Such coating design allows a calculated reflectance to be lower than 0.01% in the considered 1530-1570nm Near-Infrared range.
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