Femtosecond laser welding of silica glass fiber for robust Bragg grating sensing in high temperature environment

Oleg B. Vorobyev; Young Hwan Kim; Jianzhao Li; Michael Bakaic; Nicholas Burgwin; Abdullah Rahnama; Peter R. Herman

doi:10.1117/12.2584331

30 March 2021 Femtosecond laser welding of silica glass fiber for robust Bragg grating sensing in high temperature environment

Oleg B. Vorobyev, Young Hwan Kim, Jianzhao Li, Michael Bakaic, Nicholas Burgwin, Abdullah Rahnama, Peter R. Herman

Author Affiliations +

Proceedings Volume 11676, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXI; 1167618 (2021) https://doi.org/10.1117/12.2584331
Event: SPIE LASE, 2021, Online Only

Abstract

Femtosecond laser welding was extended to optical silica fiber (SMF-28) by focusing through fused silica substrates and ferrules to form all-glass weld seams. Laser radiation was focused into the fiber cladding to create a welding zone, which drove molten glass to fill as much as a 3 𝜇𝑚 gap around a contact line to form a crack free pseudo-continuous welding seams along the contact line. The strong weld seams up to 30 𝜇𝑚 wide were generated in fiber-to-plate and fiber-to-ferrule geometries without inducing photochemical or thermal degradation of a fiber Bragg grating (FBG) positioned only 62.5 𝜇m from the weld zone. Welding was optimized by real-time monitoring of the FBG thermo-optical shift during laser scanning. Four-point bending tests confirmed a high mechanical strength while thermal annealing showed stable mechanical and FBG responses up to 1000 ˚C. Femtosecond laser writing and welding thus demonstrated a flexible means for photonics fabrication and packaging of FBGs, enabling reliable, high frequency vibration sensing suited for high temperature and strain environments.

Conference Presentation

Citation Download Citation

Oleg B. Vorobyev, Young Hwan Kim, Jianzhao Li, Michael Bakaic, Nicholas Burgwin, Abdullah Rahnama, and Peter R. Herman "Femtosecond laser welding of silica glass fiber for robust Bragg grating sensing in high temperature environment", Proc. SPIE 11676, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXI, 1167618 (30 March 2021); https://doi.org/10.1117/12.2584331

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