Broadband chirped mirrors with a porous top layer for smooth group delay dispersion
| Autor: | Simonas Kičas, Tomas Tolenis, Lukas Ramalis, Simas Melnikas |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Chirped mirror business.industry Bandwidth (signal processing) Octave (electronics) Atomic and Molecular Physics and Optics Optics Pulse compression Group delay dispersion Electrical and Electronic Engineering business Engineering (miscellaneous) Ultrashort pulse Layer (electronics) Refractive index |
| Zdroj: | Applied optics. 60(26) |
| ISSN: | 1539-4522 |
| Popis: | The effectiveness of ultrashort pulse compression depends on the coatings group delay dispersion (GDD) characteristics in chirped mirror (CM)-based optical systems. Current porous-layer-based CMs with low GDD oscillations are limited to less than half optical octave spectral bandwidth and the stability of their spectral parameters is still unknown. In order to address these limitations, a broadband CM (covering 400 nm bandwidth) with a porous top layer was deposited and spectral parameters were measured at different environmental conditions. The modeled refractive index of the porous layer varied by approximately 1% due to the changes in humidity. Deposited coatings exhibited low sensitivity of GDD oscillations to deposition errors of porous layer and humidity in the surrounding environment. |
| Databáze: | OpenAIRE |
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