Macquarie University
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Femtosecond laser-written integrated components for future all-fibre mid-infrared laser systems

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posted on 2022-03-29, 01:52 authored by Gayathri Bharathan
Lasers emitting at mid-infrared (mid-IR) wavelengths in the 2.5-5 µm range are essential for various applications as this spectral region coincides with the vibrational-rotational absorption lines of many important atmospheric gases and liquid water. Fibre lasers are an efficient way to generate light at mid-IR wavelengths. However, mid-IR fibre laser technology is still in its infancy, mainly due to the non-existence of fibre coupled optical components to create all-fibre cavities, which severely limits their practical applications. This thesis investigates the feasibility of using a femtosecond laser to fabricate integrated components such as fibre Bragg gratings (FBGs), couplers and splitters which can add a new perspective for mid-IR all-fibre lasers. We report the development of a widely tunable (37 nm) all-fibre mid-IR laser based on a mechanically robust FBG which was inscribed through the polymer coating of a double clad fluoride fibre by focusing femtosecond laser pulses into the core of the fibre without the use of a phase mask. In a further step, the possibility of using on-chip optical couplers inscribed in fluoride and chalcogenide glasses is also investigated to pave the way for the realization of compact and robust mid-IR fibre laser systems for real-world applications in spectroscopy and medicine.


Table of Contents

1. Introduction -- 2. Background on mid-Infrared fibre laser technology -- 3. Background on the femtosecond laser inscription process -- 4. Femtosecond laser inscription of fibre Bragg gratings for fibre laser applications -- 5. Integrated optical components -- 6. Conclusion -- References.


Empirical thesis. Bibliography: pages 49-55

Awarding Institution

Macquarie University

Degree Type

Thesis MRes


MRes, Macquarie University, Faculty of Science and Engineering, Department of Physics and Astronomy

Department, Centre or School

Department of Physics and Astronomy

Year of Award


Principal Supervisor

Alex Fuerbach

Additional Supervisor 1

Stuart Jackson

Additional Supervisor 2

Darren Hudson


Copyright Gayathri Bharathan 2017. Copyright disclaimer:




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