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Title: All-fibre lasers for nonlinear wavelength conversion
Author: Rulkov, Andrey
ISNI:       0000 0004 2671 7157
Awarding Body: Imperial College London
Current Institution: Imperial College London
Date of Award: 2008
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High power fibre laser technology is a promising and rapidly developing branch of photonics. The recent progress in speciality fibres and high power ultrafast fibre sources opened an attractive possibility for the extension of the operating wavelength of fibre lasers to both the visible and infrared through the controlled action of nonlinear optical effects. This work describes experiments on highly integrated fibre optic sources extending the wavelength of high power fibre lasers towards 590 nm in the visible, which is inadeqately covered by existing high power light sources. Another major aim of the experimental work was the utilisation of the process of supercontinuum generation in fibre to create more than mW/nm level spectral brightness extremely broadband sources with a continuous coverage over a selectable wavelength range in both the visible and near infrared regions. In order to fulfil the experimental programme, speciality fibre lasers, optimised for efficient nonlinear wavelength conversion, had to be developed. A secondary aim to benefit from the advantages of all-fibre configurations whenever possible. For the supercontinuum generation, all-fibre modelocked laser sources were developed and amplified to 50 kW peak power with 5 ps duration. The amplified output was spliced to a speciality photonic crystal fibre to produce a picosecond supercontinuum spanning from 530 to 1750 nm with 1.5 W average power. Additionally, supercontinuum generation in the 1.5-2.0 pm wavelength range was demonstrated using simple CW laser pump sources and highly nonlinear step index fibre.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available