Influence of the Characteristics of Multilayer Interference Antireflection Coatings Based on Nb, Si, and Al Oxides on the Laser-Induced Damage Threshold of ZnGeP<sub>2</sub> Single Crystal
oleh: Nikolai Nikolayevich Yudin, Mikhail Zinoviev, Vladislav Gladkiy, Evgeny Moskvichev, Igor Kinyaevsky, Sergey Podzyvalov, Elena Slyunko, Elena Zhuravleva, Anastasia Pfaf, Nikolai Aleksandrovich Yudin, Maxim Kulesh
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2021-12-01 |
Deskripsi
In this work, the effect of the defect structure and the parameters of antireflection interference coatings based on alternating layers of Nb<sub>2</sub>O<sub>5</sub>/Al<sub>2</sub>O<sub>3</sub> and Nb<sub>2</sub>O<sub>5</sub>/SiO<sub>2</sub> layers on the laser-induced damage threshold of ZGP crystals under the action of Ho:YAG laser radiation at a wavelength of 2.097 μm was determined. Coating deposition was carried out using the ion-beam sputtering method. The laser-induced damage threshold of the sample with a coating based on alternating layers Nb<sub>2</sub>O<sub>5</sub> and SiO<sub>2</sub> was W<sub>0d</sub> = 1.8 J/cm<sup>2</sup>. The laser-induced damage threshold of the coated sample based on alternating layers of Nb<sub>2</sub>O<sub>5</sub> and Al<sub>2</sub>O<sub>3</sub> was W<sub>0d</sub> = 2.35 J/cm<sup>2</sup>. It has been found that the presence of silicon conglomerates in an interference antireflection coating leads to a decrease in the laser-induced damage threshold of a nonlinear crystal due to local mechanical stresses and the scattering of incident laser radiation.