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Laser action in neodymium doped silica fibre

Laser action in neodymium doped silica fibre
Laser action in neodymium doped silica fibre
This thesis describes an investigation into the suitability of neodymium doped monomode optical fibre as a gain medium for miniature laser systems.

Characterisation of the material and parameters required for quantitative analysis of such laser systems are presented in a spectroscopic analysis carried out in the first part of the thesis. Measurements performed in this section also indicate that at room temperature the wide fluorescence bands of the neodymium doped silica fibre are spectrally broadened by a homogeneous process.

The behaviour of a longitudinally pumped continuous-wave fibre laser is modelled in the next section followed by the design and realisation of a practical system. Efficiencies of approximately 6% and threshold pump powers of 8-12 mW have been obtained, even under narrow linewidth operation. Tunability over ranges of 45-60nm has also been demonstrated.

The thesis is concluded by experiments on pulsed fibre lasers. Q-switching the laser has achieved peak powers of several watts in pulses 180ns wide with good agreement between the results obtained and predicted values. Shorter pulses 450ps wide have been realised by mode-locking a fibre laser. Suggestions for reducing the pulse width further and the effects of material dispersion are also given. Finally modulated pump sources have been investigated and it is shown that synchronous pumping with short pulses has limitations due to dispersion, while resonantly pumping relaxation oscillations is a simple means of obtaining a pulsed output.
Alcock, Ian Peter
9f17911f-7ae3-4925-8704-5bc1acb0aff4
Alcock, Ian Peter
9f17911f-7ae3-4925-8704-5bc1acb0aff4
Tropper, Anne
f3505426-e0d5-4e91-aed3-aecdb44b393c

Alcock, Ian Peter (1988) Laser action in neodymium doped silica fibre. University of Southampton, Faculty of Science, Physics Department, Doctoral Thesis, 180pp.

Record type: Thesis (Doctoral)

Abstract

This thesis describes an investigation into the suitability of neodymium doped monomode optical fibre as a gain medium for miniature laser systems.

Characterisation of the material and parameters required for quantitative analysis of such laser systems are presented in a spectroscopic analysis carried out in the first part of the thesis. Measurements performed in this section also indicate that at room temperature the wide fluorescence bands of the neodymium doped silica fibre are spectrally broadened by a homogeneous process.

The behaviour of a longitudinally pumped continuous-wave fibre laser is modelled in the next section followed by the design and realisation of a practical system. Efficiencies of approximately 6% and threshold pump powers of 8-12 mW have been obtained, even under narrow linewidth operation. Tunability over ranges of 45-60nm has also been demonstrated.

The thesis is concluded by experiments on pulsed fibre lasers. Q-switching the laser has achieved peak powers of several watts in pulses 180ns wide with good agreement between the results obtained and predicted values. Shorter pulses 450ps wide have been realised by mode-locking a fibre laser. Suggestions for reducing the pulse width further and the effects of material dispersion are also given. Finally modulated pump sources have been investigated and it is shown that synchronous pumping with short pulses has limitations due to dispersion, while resonantly pumping relaxation oscillations is a simple means of obtaining a pulsed output.

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More information

Published date: 1988
Organisations: University of Southampton

Identifiers

Local EPrints ID: 404730
URI: https://eprints.soton.ac.uk/id/eprint/404730
PURE UUID: e4e83b55-6e84-4a5f-945c-c4378e25ebfc

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Date deposited: 18 Feb 2017 00:24
Last modified: 13 Mar 2019 20:18

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Contributors

Author: Ian Peter Alcock
Thesis advisor: Anne Tropper

University divisions

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