Citation

Aljamimi, S.M. and Grégoire, N. and Anjos, V. and Yusoff, Zulfadzli and Messaddeq, Y. (2026) Fabrication of silica-based fiber doped with tungsten nanoparticles for second harmonic generation. Optical Fiber Technology, 99. p. 104607. ISSN 1068-5200

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Abstract

A novel silica-based fiber doped incorporating sub-stoichiometric tungsten oxide nanoparticles WO(3− x) was developed to investigate second-order nonlinear optical response, with an emphasis on second harmonic generation (SHG). WO(3− x) nanoparticles were synthesized and incorporated into the silica preform core using a modified chemical vapor deposition (MCVD) process combined with solution doping and subsequent drawn into a fiber. Under 1033 nm femtosecond excitation, both the doped preform and the corresponding fiber exhibited a distinct SHG emission band centered at 517 nm consistent with frequency doubling of the fundamental wavelength. The SHG signal increased with pump power following a predominantly quadratic dependence, confirming a second-order nonlinear mechanism in the WO(3− x) doped silica host. From the measured SHG output, a lower bound for the effective nonlinear coefficient was estimated to be deff ≥ 2.2 × 10− 5 pm/V. These findings demonstrate the feasibility of WO(3− x) nanoparticle doped silica fibers as a second-order nonlinear processes and guided wave frequency conversion.

Item Type:	Article
Uncontrolled Keywords:	Silica fiber, tungsten oxide
Subjects:	T Technology > TN Mining engineering. Metallurgy > TN600-799 Metallurgy
Divisions:	Faculty of Artificial Intelligence & Engineering (FAIE)
Depositing User:	Ms Rosnani Abd Wahab
Date Deposited:	02 Apr 2026 04:17
Last Modified:	06 Apr 2026 05:59
URII:	http://shdl.mmu.edu.my/id/eprint/15650

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