Air-clad fibre laser with internal Bragg grating

Canning, John; Jackson, Stuart D.; Åslund, Mattias L.; Groothoff, Nathaniel; Ashton, Brian; Lyytikäinen, K.

doi:10.1049/el:20052851

Cited by 20 publications

(10 citation statements)

References 2 publications

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“…However, there appears to be a limit to the power handling capability of Type I FBGs. Though not discussed in the paper; whilst demonstrating a 13 W air-clad fibre laser employing a Type I UV FBG written within the rare-earth doped active core, we observed an apparent photoassociated erasure effect of the grating [6]. The origin of the photo-erasure effect was not identified at the time, but it was noted that there was no significant shift of the Bragg wavelength -which would have indicated an elevated average temperature of the core region -so the effect was attributed to unresolved local interactions on the molecular level.…”

Section: Introductionmentioning

confidence: 77%

Photo-erasure of type-II femtosecond laser written Bragg gratings employed as high reflectors in moderate power Q-switch fibre laser

Åslund

Jovanović

Jackson

et al. 2009

Optical Sensors 2009

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Section: Introductionmentioning

confidence: 77%

Photo-erasure of type-II femtosecond laser written Bragg gratings employed as high reflectors in moderate power Q-switch fibre laser

Åslund

Jovanović

Jackson

et al. 2009

Optical Sensors 2009

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“…Inset schematic shows a part of the air cladding structure surrounding the core. Surprisingly, the temperature saturates although the output power does not [48]. Beyond 15 W the grating disappears and lasing stops [49].…”

Section: Hypersensitised Type Ihsmentioning

confidence: 98%

Fibre gratings and devices for sensors and lasers

Canning

2008

Laser & Photonics Reviews

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262

158

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Although mainstream grating writing, more often than not using single photon excitation of germanosilicate based defects with CW 244 nm light, remains the key technology for complex devices it is now being complemented by a whole host of processes which can enhance and tailor the properties of both conventional and not-so-conventional fibre Bragg gratings. Further, processes for writing of gratings in non-germanosilicate fibres have also continued to develop and include multi-photon excitation directly into the band edge of the glass. It is now possible to custom tailor a gratings property based on the application and the nature of production as well as custom tailor the grating writing process to suit the type of fibre and application. Examples and suggestions where these can benefit sensors and lasers are outlined.The various diffraction orders produced through a phase mask during UV direct writing of Bragg gratings -the two brightest are the +1 and −1 orders whilst the central zero order is suppressed most. This method remains the most commonly used approach to fibre Bragg grating writing, including in very large diameter fibres.

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“…Type II gratings written by using energies above T2 damage threshold [31] of the glass lead to very stable gratings. Normal Type I gratings are thermally annealed at low temperatures and have not been able to be incorporated within the active medium of fiber lasers for operation above 14 W [8,9,32]. These results in an air clad structured fiber led to work on with femtosecond gratings within our group.…”

Section: Application Of Femtosecond Lasersmentioning

confidence: 99%