Developing a Multi-axis Femtosecond Laser Micromachining Platform for Laser Induced Refractive Index Modification: Fiber Bragg Gratings, Waveguides, and Beyond

This thesis presents the development of a multi-axis femtosecond laser micromachining platform. System capabilities were demonstrated by inscribing Fiber Bragg Gratings and waveguides using a 1040 nm laser, extended to 750 nm and 1260 nm with an Optical Parametric Amplifier. Precise control over FBG pitch and length were achieved, with results showcasing strong refractive index modifications. FBGs exhibited reflectivity’s exceeding 25 dB, and bandwidth of less than 200~pm for 1~mm long second order devices. High temperature annealing to 1000~^\circC was performed and a combination of Type 1 and Type 2 index change is observed. Further investigations included inscribing waveguides and exploring the impact of different laser wavelengths on FBG inscription performance. Design challenges and solutions associated with the micromachining platform, including system integration and tuning, are discussed. Experimental results highlight the effectiveness of the system to produce quality FBGs and waveguides, demonstrating flexibility for high precision laser material processing.

Name thesis:degree_name

Master of Applied Science (M.App.Sc.)

Level thesis:degree_level

Master's

Discipline thesis:degree_discipline

Engineering, Electrical and Computer

Grantor dc:publisher

Carleton University

Year dc:date.issued

2024

Author dc:creator

• Neumann, James Edward

Statement dc:rights

• Copyright © 2024 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, distribution to students, research and scholarship. Theses may only be shared by linking to the Carleton University Institutional Repository and no part may be copied without proper attribution to the author; no part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.

Language dc:language.iso

en

DOI

10.22215/etd/2024-16014

OAI identifier oai:identifier

oai:carleton.scholaris.ca:20.500.14718/41300