Quality Assessment of Variable Reflectivity Laser Mirrors with High Laser –Induced Damage Threshold and Structural Analysis
| Autor: | Hasan Ebadian, Omid Sheikhi, Mahdi Mardiha |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | Journal of Optoelectronical Nanostructures, Vol 9, Iss 1, Pp 1-15 (2024) |
| Druh dokumentu: | article |
| ISSN: | 2423-7361 2538-2489 |
| DOI: | 10.30495/jopn.2023.32299.1298 |
| Popis: | Abstract: We report the results of an experimental study on the fabrication of a multilayer variable reflectivity laser mirror and the morphological analysis of optical thin film layers. In a design procedure, a series of variable reflectivity laser mirrors are fabricated and characterized with different methods. In this research, based on pulsed solid-state Nd:YAG lasers at 1064 nm, two types of variable reflectivity laser mirrors with (HfO2/SiO2) and (ZrO2/SiO2) materials are fabricated by electron beam evaporation method. The central reflectivity of R0 =30 and 35 % for two super Gaussian orders of n=3 and 4 is manufactured and qualified by ellipsometry and laser beam scan methods. The Laser-induced damage threshold experiments demonstrated that, the VRMs with multilayers of HfO2/SiO2, have a higher Laser-induced damage threshold than ZrO2/SiO2, which was 10 J/cm2 and 7 J/cm2, correspondingly. Also, in a novel and exact FESEM approach, the morphological structure of the VRM thin layers was monitored which gives a deeper insight into the layer structure and helped us to calibrate the PVD device for shaped VRM. |
| Databáze: | Directory of Open Access Journals |
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