The waveguide can be of single-layer or multilayer design, where the latter is also referred to as a coupled waveguide. reactive ion etching or ion beam etching). See for detailed information about the licence. interference-beam or electron-beam) and then a subsequent etching pro-cess to transfer the grating lines into the material (e.g. Diffraction gratings are used in many different experiments with many different wavelengths of light, and there are myriad considerations for optimizing the. 23 The fiber photosensitization is not essential for FBGs written with fs-laser, so the hydrogen-load and thermal annealing treatments are not necessary, which greatly reduces the fabrication process and cost.
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