Demonstration of Type A volume Bragg gratings inscribed with a femtosecond Gaussian-Bessel laser beam
Idioma
en
Article de revue
Este ítem está publicado en
Optics Express. 2023-04-28, vol. 31, n° 10, p. 15736-15746
Optical Society of America - OSA Publishing
Resumen en inglés
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 ...Leer más >
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.< Leer menos
Palabras clave en inglés
Femtosecond Laser inscription
Silver-containing glasse
Silver clusters
Photosensitive glasses
Photonic integrated circuits
Refractive index modifications
Volume Bragg grating
Proyecto ANR
Architectures photoniques intégrées inscrites par laser femtoseconde pour étalonnage en microscopie de fluorescence dans l'infrarouge
Orígen
Importado de HalCentros de investigación