Fabrication and applications of fibre Bragg gratings


The consequences of fabricating Bragg gratings in various fibres, with or without hydrogen loading, and with varying laser power levels are explored. Three new techniques for fabricating chirped gratings are presented. Beams with dissimilar wavefront curvatures are interfered to give chirped gratings. With the same aim techniques of writing gratings on tapered fibres and on deformed fibres are also covered. With these techniques, a wide variety of gratings has been fabricated from the 'superbroad' (with bandwidths of up to 180 nm), small to medium bandwidth gratings with linear chirp profiles and quadratic chirped gratings. It is demonstrated that chirped grating can be concatenated to form all-fibre Fabry-Perot and Moiré resonators. These are further concatenated with chirped gratings to produce filters with narrow passbands and very broad stopbands. A number of other applications are also addressed. The use of chirped fibre gratings for dispersion compensation and femtosecond chirped pulse amplification is demonstrated. Chirped gratings are used as dispersive elements in modelocked fibre lasers producing ultrashort pulses. A chirped fibre grating Fabry-Perot transmission filter is used in a continuous wave laser that exhibits eleven simultaneously lasing wavelengths. Finally, the use of grating-coupler devices as variable reflectivity mirrors for laser optimisation and gain clamping is considered.

Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
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Institution: Aston University
Uncontrolled Keywords: fabricating Bragg gratings,hydrogen loading,Beams with dissimilar wavefront curvatures,all-fibre Fabry-Perot and Moiré resonators
Last Modified: 28 Jun 2024 07:42
Date Deposited: 25 Jun 2010 15:10
Completed Date: 1996
Authors: Sugden, Kate (ORCID Profile 0000-0001-6323-1082)


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