بررسي توزيع ميدان الكتريكي بر آستانه آسيب آينه‌هاي ليزر

High-power laser systems require mirrors with high damage thresholds; laser coatings exposed to strong laser radiation are damaged due to absorption. Dielectric mirrors with low absorption are a good alternative to metal mirrors in high-power lasers. Dielectric mirrors can be made with a set of pairs of layers with a quarter-wave optical thickness, depending on the wavelength of the laser used, with high refractive index materials an‎d low refractive index materials. The absorption of radiation at any point is directly proportional to the intensity of the electric field at that point. In quarter-wave mirrors, the intensity of the electric field is higher at the boundaries, which are more vulnerable points than inside the layers. In this thesis, by identifying an‎d using high an‎d low refractive index materials, as well as investigating the best method of layer deposition an‎d optimizing the thickness of the layers, we move the maximum electric field from the boundaries of the layers an‎d into the layers of low refractive index materials, which have a higher damage threshold than high refractive index materials. an‎d finally, by taking the laser damage threshold measurement process, we show how optimizing layer thickness affects the laser damage threshold an‎d what is the best layer deposition method for making laser mirrors at a wavelength of 1064 nm.

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