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Femtosecond laser inscribed Co-located Fiber Bragg Gratings for random fiber laser generation
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DOI：10.1016/j.optlaseng.2026.109847.png)
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Abstract
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• A structure of Co-located Fiber Bragg Gratings (FBGs) fabricated via femtosecond laser point-by-point inscription is proposed. • Disorder is introduced through refractive index modulation, Rayleigh scattering, and dual-period stochastic block deviations inherent to the Co-located FBGs structure, a mechanism verified by multiphysics simulations to establish a positive correlation between localization intensity and the degree of disorder. • A hybrid random feedback cavity, formed by integrating random distributed feedback with Co-located FBGs, is demonstrated to achieve stable dual-wavelength random lasing in a fiber laser system.
Keywords:
Femtosecond laser inscription
Co-located Fiber Bragg Gratings
Random lasing
Disorder engineering
Hybrid random feedback cavity
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