Published research

Papers, proceedings, and thesis work.

Research on femtosecond laser inscription, fibre Bragg gratings, high temperature optical devices, laser micromachining systems, and fibre optic sensing.

2025 Type-X FBG paper 2020 pipeline sensing paper 2024 master’s thesis
Research outputs

From fabrication method to measured device.

The publication record connects instrument development, inscription physics, environmental sensing, and the performance of laser written optical fibre devices.

2025 Peer-reviewed journal article · Open access

Line-by-line type-X FBGs with high-temperature stability and low loss

James E. Neumann and Christopher W. Smelser

Optics Express, Volume 33, Issue 20, pages 42129–42141 · 6 October 2025

Diagram of a Type-X fibre Bragg grating sensor array with second-, third-, and fourth-order gratings
Type-X FBG array design used for the high-temperature annealing study.

This work presents a line-by-line method for producing Type-X fibre Bragg gratings with Type-I like modification profiles and Type-II like thermal stability. The study identifies how repeated scans and grating order influence scattering damage, insertion loss, and the formation regime, then validates device stability beyond 1000 °C through isochronal annealing.

Full text through Optica ↗ PubMed record ↗ Related project →
2020 Conference paper

Oil pipeline leak detection using through-the-coating written fiber Bragg grating sensors

Stephen J. Mihailov, Robert B. Walker, James Neumann, Manny De Silva, Dan Grobnic, and Cyril Hnatovsky

Optical Fiber Sensors Conference 2020 Special Edition · OSA Technical Digest · paper Th4.12

Through-the-coating femtosecond written FBGs were integrated into hydrocarbon responsive packages that apply or release strain when exposed to toluene or crude oil, creating an optical trigger for pipeline leak detection.

Optica record ↗
2024 Master’s thesis

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

James Edward Neumann · Supervisor: Professor Christopher Smelser

Master of Applied Science, Electrical and Computer Engineering · Carleton University · 83 pages

Nominated for the senate medal, this thesis documents the design, construction, software integration, and experimental validation of a multi axis femtosecond laser micromachining platform. Its capabilities were demonstrated through laser induced refractive index modification and the inscription of fibre Bragg gratings and waveguide structures.

Permanent thesis record ↗ Carleton repository ↗ Related project →

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