Studying the influence of deposition methods on ultrashort pulse generation

Ahmad, Harith and Loganathan, Kirubhashni and Yusoff, Norazriena and Zulkifli, Mohd Zamani (2025) Studying the influence of deposition methods on ultrashort pulse generation. Photonics and Nanostructures - Fundamentals and Applications, 63. pp. 1-8. ISSN 1569-4410 E-ISSN 1569-4429

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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 airbrush-sprayed 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.

Item Type:	Article (Journal)
Additional Information:	8870/124265
Uncontrolled Keywords:	Mode-locking, Saturable absorber, Drop-casting technique, Spraying technique, Reduced graphene oxide/Magnesium oxide
Subjects:	Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science Kulliyyah of Science > Department of Physics
Depositing User:	Dr M Z Zulkifli
Date Deposited:	11 Nov 2025 16:18
Last Modified:	11 Nov 2025 16:48
URI:	http://irep.iium.edu.my/id/eprint/124265

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