Ahmad, H. and Yasmin, M.W.K.M.F. and Lutfi, M.A.M. and Zaini, M.K.A. and Samion, M.Z. and Sagadevan, S. and Rusni, N.A.M. and Thambiratnam, K. and Mahmoodin, Z. and Sun, S. (2026) Ternary composite g-C₃N₄/MXene/Co₃O₄ as an efficient SA for 2-μm mode-locked fiber lasers. Journal of Alloys and Compounds, 1071 (1). p. 188864.
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Abstract
There is a growing demand for ultrashort fiber lasers at 2.0 µm due to their important role in cutting-edge fields such as spectroscopy, clinical surgery, and optical telecommunications. While standard two-dimensional (2D) materials are widely used as passive saturable absorbers (SAs), their performance is often limited by low modulation depths and structural degradation, such as oxidation. To overcome this, a novel ternary nanocomposite of g-C₃N₄/MXene/Co₃O₄ was fabricated and integrated into a mode-locked thulium-doped fiber laser (TDFL) cavity as a highly efficient SA. Nonlinear optical characterization of the integrated SA shows a higher modulation depth of 20.3 and a high saturation intensity of 39.4 MW/cm². It produced ultrashort 1.3 ps pulses at 1927.8 nm and a fundamental repetition rate of 17.67 MHz. The cavity demonstrates outstanding long-term operational stability, with minimal spectral or temporal drift over a continuous 300-minute observation period and a signal-to-noise ratio (SNR) of 44.3 dB. These results establish that the g-C₃N₄/MXene/Co₃O₄ nanocomposite has the potential to serve as an optical modulator for advancing ultrafast nonlinear photonics in the mid-infrared regime. © 2026 Elsevier B.V.
| Item Type: | Article (Journal) |
|---|---|
| Additional Information: | Cited by: 1 |
| Uncontrolled Keywords: | Fibers; Light modulators; Locks (fasteners); Mode-locked fiber lasers; Nonlinear optics; Optical signal processing; Pulse repetition rate; Saturable absorbers; Thulium; Clinical surgery; Cutting edges; G-c₃n₄/mxene/co₃o₄; Growing demand; Mode-locked; Modulation depth; Optical telecommunication; Ternary composites; Thulium-doped fibers; Two-dimensional materials; Fiber lasers |
| Subjects: | Q Science > QC Physics |
| Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): | UNSPECIFIED |
| Depositing User: | Ts. Dr. Kavintheran Thambiratnam |
| Date Deposited: | 19 Oct 2026 10:39 |
| Last Update: | 19 Oct 2026 10:39 |
| Queue Number: | 2026-10-Q5669 |
| URI: | http://irep.iium.edu.my/id/eprint/131803 |
| Indexed In: | WOS and SCOPUS |
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