Analysis of the effects of arc-shape fibre structure on the performance of passively mode-locking thulium/holmium-doped fibre laser

Ahmad, Harith and Loganathan, Kirubhashni and Yusoff, Norazriena and Samion, Muhamad Zharif and Thambiratnam, Kavintheran (2025) Analysis of the effects of arc-shape fibre structure on the performance of passively mode-locking thulium/holmium-doped fibre laser. Optoelectronics and Advanced Materials, Rapid Communications, 19 (11-12). 475 -483. ISSN 1842-6573 E-ISSN 2065-3824

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Abstract

This study investigated the impact of arc-shaped fibre structures coated with a composite material on a Thulium/Holmium-doped fibre laser (THDF). Two types of arc-shaped fibres were utilised: single and dual arc. Both arc-shaped fibres were fabricated using the wheel-polishing technique. A two-step polishing process was employed for the dual arc-shaped fibre. The reduced graphene oxide/manganese oxide (rGO/Mn3O4) composite was subjected to hydrothermal treatment and then dropped onto both arc-shaped fibres. The modulation depth of rGO/Mn3O4 in a single arc-shaped fibre was 51.15 and 48.79 for the dual arc. Mode-locked pulses were generated individually by placing the saturable absorbers (SAs) in the cavity and fine-tuning the polarisation controller (PC). The pulse duration was 1.544 ps and 1.634 ps for the single and dual arc-shaped fibres. The two mode-locked pulses produced were remarkably stable, with a signal-to-noise ratio (SNR) exceeding 60 dB. Due to its lower insertion loss, the single arc shape fibre-based SA outperformed the dual arc in various aspects, including SNR, pulse duration, average power, and efficiency. The findings of this work provide a compelling alternative for generating ultrashort pulse lasers that are both compact in size and highly effective in performance. © 2025, National Institute of Optoelectronics. All rights reserved.

Item Type:	Article (Journal)
Uncontrolled Keywords:	Mode-locking, Saturable absorber, Single arc-shape fibre, Dual arc-shape fibre, 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:	Ts. Dr. Kavintheran Thambiratnam
Date Deposited:	09 Oct 2026 15:39
Last Update:	09 Oct 2026 15:39
Queue Number:	2026-10-Q5493
URI:	http://irep.iium.edu.my/id/eprint/131780
Indexed In:	WOS and SCOPUS

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