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Article Dans Une Revue Optics Express Année : 2023

Demonstration of Type A volume Bragg gratings inscribed with a femtosecond Gaussian-Bessel laser beam

Résumé

To our knowledge, we report on the first demonstration of Type A VBGs inscribed in silver-containing phosphate glasses by femtosecond laser writing. The gratings are inscribed plane-by-plane by scanning the voxel of a 1030 nm Gaussian-Bessel inscription beam. This results in a refractive-index modification zone, induced by the appearance of silver clusters, extending over a much larger depth than those obtained with standard Gaussian beams. As a result, a high diffraction efficiency of 95% at 632.8 nm is demonstrated for a 2-µm period transmission grating with a 150-µm effective thickness indicating a strong refractive-index modulation of 1.78 × 10 −3. Meanwhile, a refractive-index modulation of 1.37 × 10 −3 was observed at a wavelength of 1.55 µm. Thus, this work opens the avenue for highly effective femtosecond-written VBGs suitable for industrial applications.
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Dates et versions

hal-04085272 , version 1 (28-04-2023)

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Joelle Harb, Lauris Talbot, Yannick Petit, Martin Bernier, Lionel Canioni. Demonstration of Type A volume Bragg gratings inscribed with a femtosecond Gaussian-Bessel laser beam. Optics Express, 2023, 31 (10), pp.15736-15746. ⟨10.1364/oe.483722⟩. ⟨hal-04085272⟩
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