Formation of nanogratings driven by ultrafast laser irradiation in mid -IR heavy oxide glasses
Language
en
Article de revue
This item was published in
Ceramics International. 2022
Elsevier
Date
2022English Abstract
This work demonstrates for the first time the formation of nanogratings inside Barium Gallo-Germanate glasses using femtosecond laser direct writing. These heavy oxide glasses, with a characterized transparency window up ...Read more >
This work demonstrates for the first time the formation of nanogratings inside Barium Gallo-Germanate glasses using femtosecond laser direct writing. These heavy oxide glasses, with a characterized transparency window up to 6 µm, along with the polarization sensitive birefringent nanostructures induced by femtosecond laser, offer an excellent platform for the development of mid-Infrared photonic applications. The fabricated glasses, containing both rare earth (Gd, Y) and transition metals (Zn, Ta), are directly compared to amorphous GeO 2 and commercial alumino-germanate (Corning-9754) glasses commonly used in this field. The nanogratings processing window in each glass was investigated by varying laser parameters (pulse duration, energy, repetition rate), and electron microscopy imaging directly evidenced the porous nanostructures. Among the results, a strong form birefringence in 8% ZnO-BGG glass, e.g., up to-0.029±0.001 was reported. Finally, birefringent embedded Fresnel GRIN plates were directly written in a BGG glass, to demonstrate the functionalization potential of these materials.Read less <
English Keywords
Femtosecond laser
Barium gallo-germanate glass
Nanogratings
Birefringence
Photonic applications
Origin
Hal imported