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Abstract
The photonic crystal ber technology provides means to realize bers
optimized for high power operation, due to the large single-mode cores and
the unique design
exibility of the microstructure. The work presented in
this thesis focuses on improving the properties of active photonic crystal
bers for high power ber lasers and ampliers, and on adding new
functionality to the fibers - all with the purpose of pushing the technology
towards high powers.
The first part of the work has been to investigate photo darkening,
the mitigation of which is crucial in the quest for higher powers. The work
has contributed to the compounding of new and improved material compositions.
The second part is an investigation of pump absorption in photonic
crystal bers, demonstrating that the microstructure in photonic crystal
bers improves the pump absorption by up to a factor of two compared to
step-index bers. This plays an important role in high power lasers and
ampliers with respect to efficiency, packaging, and thermal handling. The
third part of the work has involved developing tools for characterizing the
mode quality and stability of large core bers. Stable, single-mode bers
with larger cores are essential to the pursuit for higher powers and the tools
have enabled the development of one of the largest and most stable
exible
large core bers on the market. The forth, and largest part of the work, has
focused on developing a ber amplier with gain shaping for high power
amplication at 1178 nm. Several high power records have been set using
this ber. An output power of 167 W has been achieved, which, at the time
of writing, is the highest output power generated from ytterbium bers in
this wavelength region and from photonic bandgap bers in general. The
1178 nm light has subsequently been frequency doubled to 589 nm with
high efficiency. Finally, the last part of the work has been the development
of the rst ever tunable ber laser based on a liquid crystal inltrated
photonic crystal ber for operation at 1040{1065 nm.
Original language | English |
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Place of Publication | Kgs. Lyngby, Denmark |
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Publisher | Technical University of Denmark |
Number of pages | 157 |
Publication status | Published - Sept 2011 |
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Dive into the research topics of 'Active Photonic crystal fibers for high power applications'. Together they form a unique fingerprint.Projects
- 1 Finished
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Active Photonic Crystal Fibres for High Power Applications
Olausson, C. B. T. (PhD Student), Bjarklev, A. O. (Main Supervisor), Hansen, K. P. (Supervisor), Petersen, P. M. (Examiner), Ramachandran, S. (Examiner) & Scott, A. M. (Examiner)
01/11/2007 → 24/08/2011
Project: PhD