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Metal-doped fibre laser

English title Metal-doped fibre laser
Applicant Lüthy Willy
Number 121663
Funding scheme Project funding (Div. I-III)
Research institution Institut für angewandte Physik Universität Bern
Institution of higher education University of Berne - BE
Main discipline Technical Physics
Start/End 01.10.2008 - 30.09.2010
Approved amount 126'409.00
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Keywords (7)

fibre lasers; metal and transition-metal doping; broad band emission; turnable emission; Fibre laser; Metal-doped fibre; Spectroscopy

Lay Summary (English)

Lead
Lay summary
Actually we study manufacturing of metal and transition metal doped fibres in the framework of SNSF Project 20020-113269 “Novel active fibres with broad-band emission”. The goal is the generation of compact light sources with large bandwidth for applications where low temporal coherence is needed. We have also produced silica fibres doped with different rare earth ions such as Nd3+, Er3+, Tm3+, Ho3+ and Yb3+ that allow the generation of fluorescent light at wavelengths ranging from 365 nm- 2300 nm. These fibres, when transversally single mode, show a promising brilliance exceeding3 kW sr-1cm-2. A drawback of these rare earth-doped fibres is the occurrence of spectra with a series of peaks instead of a smooth emission over the whole spectral range. Therefore we scan a large number of different metal-doped fibres to measure their individual spectra in order to find a combination that covers smoothly a large band of wavelengths. Recently, in a metal-doped fibre laser action could be achieved. The active ion was trivalent bismuth. This proves that active fibres are by no means limited to rare earth-doped fibres. Most probably a number of other metal-doped fibres can show laser action too. This opens a wide field of research to examine other promising candidates. In this project we will produce metal-doped fibres with the method of dry granulated oxides that has already been used in SNSF Project 20020-113269. The light guiding properties of the fibres will be tailored with co-doping of trivalent aluminium. This technique allows a rapid production of fibre preforms at a relatively low price. The preforms are then drawn to fibres in our drawing tower. The fibres will be characterised and laser experiments will be performed.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

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Associated projects

Number Title Start Funding scheme
113269 Novel active fibres with broad-band emission 01.10.2006 Project funding (Div. I-III)

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