Studying the influence of deposition methods on ultrashort pulse generation
Document Type
Article
Publication Date
2-1-2025
Abstract
This study investigates the influence of deposition methods on the laser performance of Erbium-doped fiber lasers (EDFL). Two deposition methods, namely the drop-casting and airbrush-sprayed techniques, were employed. The reduced graphene oxide/magnesium oxide (rGO/MgO) composite applied using drop-casting on arc-shaped fiber shows a higher modulation depth of 3.27 %, surpassing the 2.12 % achieved by the airbrushsprayed version. Both composites' structures ensure high thermal stability, allowing for continuous operation for 5 hours without performance degradation. The generation of mode-locking in the EDFL occurred when the incident light interacted with the rGO/MgO composite through the evanescent wave, reaching the threshold pump power of 389.69 mW. Integrating the saturable absorber (SA) in the cavity and adjusting the polarization controller (PC) enables stable pulse generation with a pulse duration of 0.91 ps for drop-casted arc-shape fiber and 1.32 ps for sprayed arc-shape fiber with a fundamental frequency of 18.10 MHz. The difference in modulation depth and laser performance is due to the condensed deposition achieved using drop-casting, resulting in improved interaction between light and matter and better saturable absorption properties. The results of this research provide a compelling alternative for ultrafast fiber lasers that are both compact and efficient, and they have the potential to be utilized in high-speed optical communication as well as medicinal imaging technologies.
Keywords
Mode-locking, Saturable absorber, Drop-casting technique, Spraying technique, Reduced graphene oxide/Magnesium oxide
Divisions
PHYSICS
Funders
Ministry of Education, Malaysia [Grant No: PRC-2022],Universiti Malaya [Grant No: IIRG001C-2023; BKS002-2023]
Publication Title
Photonics and Nanostructures - Fundamentals and Applications
Volume
63
Publisher
Elsevier
Publisher Location
RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS