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Blue and UV transmission in optical fibres

Blue and UV transmission in optical fibres
Blue and UV transmission in optical fibres
The work presented in this thesis shows that the predominant factor limiting high power transmission at blue/green wavelengths in germanosilicate optical fibres is two-photon absorption leading to the creation of colour centres. It is determined that these colour centres are germania-related, and cause a large induced absorption in the fibre at the operating wavelength. It is demonstrated that these centres can be bleached out by single-photon absorption, leading to an intensity-dependent absorption. The long optical path lengths mean that even at very low concentrations these colour centres can seriously degrade the fibre performance.

Theoretical analysis of the experimental results indicates that there are three types of defect involved in the dynamics of the system, each with its own characteristic trapping and decay rates. The precursor defects are shown to be caused by an oxygen deficiency in the glass, and the induced absorption resembles the optical absorption associated with Ge(1) centres.

Research into the production of improved fibres is also reported. There are a number of ways in which the fabrication of germanosilicate fibres can be modified, either to reduce their photochromaticity or to enhance it, as required for nonlinear applications such as second harmonic generation or photorefractive effects. For applications where high power handling capabilities are required the development of polarisation-maintaining single-mode optical fibres has been investigated. The fabrication of fibres capable of transmitting several Watts of blue/green light without degradation is presented.
Poyntz-Wright, Louise
635aad8b-d535-4756-9c13-fdb654a8937f
Poyntz-Wright, Louise
635aad8b-d535-4756-9c13-fdb654a8937f
Russell, P.St.J.
77db5e8d-8223-4806-ae60-a106619a022a

Poyntz-Wright, Louise (1990) Blue and UV transmission in optical fibres. University of Southampton, Faculty of Engineering, Electronics Department, Optical Fibre Group, Doctoral Thesis, 213pp.

Record type: Thesis (Doctoral)

Abstract

The work presented in this thesis shows that the predominant factor limiting high power transmission at blue/green wavelengths in germanosilicate optical fibres is two-photon absorption leading to the creation of colour centres. It is determined that these colour centres are germania-related, and cause a large induced absorption in the fibre at the operating wavelength. It is demonstrated that these centres can be bleached out by single-photon absorption, leading to an intensity-dependent absorption. The long optical path lengths mean that even at very low concentrations these colour centres can seriously degrade the fibre performance.

Theoretical analysis of the experimental results indicates that there are three types of defect involved in the dynamics of the system, each with its own characteristic trapping and decay rates. The precursor defects are shown to be caused by an oxygen deficiency in the glass, and the induced absorption resembles the optical absorption associated with Ge(1) centres.

Research into the production of improved fibres is also reported. There are a number of ways in which the fabrication of germanosilicate fibres can be modified, either to reduce their photochromaticity or to enhance it, as required for nonlinear applications such as second harmonic generation or photorefractive effects. For applications where high power handling capabilities are required the development of polarisation-maintaining single-mode optical fibres has been investigated. The fabrication of fibres capable of transmitting several Watts of blue/green light without degradation is presented.

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More information

Published date: 1990
Organisations: University of Southampton, Optoelectronics Research Centre

Identifiers

Local EPrints ID: 400703
URI: https://eprints.soton.ac.uk/id/eprint/400703
PURE UUID: 7b4957f2-28f3-4c9f-bbca-950be3d8db80

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Date deposited: 16 Dec 2016 22:27
Last modified: 01 Aug 2017 16:32

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Contributors

Author: Louise Poyntz-Wright
Thesis advisor: P.St.J. Russell

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