Femtosecond direct laser writing of an integrated gain medium in the near-IR range in a bismuth containing glass
Year: 2025
Type: article
Abstract: We report on femtosecond direct laser writing (FDLW) of single-mode optical waveguide supported by bismuth photochemistry in a zinc phosphate glass. Propagation attenuation of 2 dB.cm −1 at 976 nm was measured. The waveguide was written twice with 16 laser passes separated by 250 nm to make a square-like structure of 6 µm × 6 µm to perform a single-mode waveguide at 976 nm. The refractive index contrast of the waveguide was estimated to 1.5 × 10 −3 by phase imaging microscopy. Hyper-spectral near-IR fluorescence confocal microscopy was performed to confirm the laser-induced valence change of Bi 3+ to Bi + ions, at the waveguide localization, demonstrating the FDLW creation of an integrated laser gain medium. Finally, a demonstration of waveguided laser amplification at 1345 nm is presented in this work.
Source: Optics Letters
DOI: 10.1117/12.3099819
Language: English
Subfield: Computational Mechanics
Field: Engineering
Domain: Physical Sciences
Open Access status: green
Awards: G1190173965, University of Bordeaux Graduate Scholl in Light Sciences & Technologies, G2659019386, G2838850286, G2994898583, G3010527862, G3656560574, G434337789, FUNctional GLASS, Femtosecond laser-induced integrated photonic architectures for infrared fluorescent microscopy standards, G6803667113, Micro - nanoscale 3D printing of silica-based GLASses for optical SENSors
OpenAlex ID: W4409284776