Buried channel waveguides in Yb-doped KY(WO4)2 fabricated by femtosecond laser irradiation
Buried channel waveguides in Yb-doped KY(WO4)2 fabricated by femtosecond laser irradiation
We report on the fabrication of optical channel waveguides inside KY(WO4)2 crystals, both undoped and Yb-doped, for applications in compact solid-state lasers and three-dimensional photonic devices. Nonlinear absorption of femtosecond laser pulses has been employed in order to induce refractive-index changes in these crystals. The irradiation damage results in a decrease of the material density compared to the surrounding bulk. In this work, two types of buried channel waveguides have been fabricated in the KY(WO4)2 crystals. First ones (type I) were formed in the vicinity of the irradiated regions due to the presence of an induced compressive lattice strain, which causes an increase of the local refractive index. Light can be better confined in the second (type II) of channel waveguides that are created between pairs of damaged regions. For the best confined channels (type II), the propagation loss value measured at 1 ?m amounted to 2–2.5 dB/cm.
femtosecond-laser writing, burried channel waveguides, KY(WO4)2 crystals
8300-8303
Borca, C.N.
ae17633e-464e-4ee6-bfa7-9f4326817680
Apostolopoulos, V.
8a898740-4c71-4040-a577-9b9d70530b4d
Gardillou, F.
4645628a-f590-4d5b-b642-0d3c40e49625
Limberger, H.G.
10cfb4e7-08e9-429d-9ea9-b31145e5d9e5
Pollnau, M.
1094856b-791a-4050-98d9-c07777d5f0f5
Salathé, R.-P.
5938ed79-bfef-4f6f-bd1b-cdf0b69af659
31 July 2007
Borca, C.N.
ae17633e-464e-4ee6-bfa7-9f4326817680
Apostolopoulos, V.
8a898740-4c71-4040-a577-9b9d70530b4d
Gardillou, F.
4645628a-f590-4d5b-b642-0d3c40e49625
Limberger, H.G.
10cfb4e7-08e9-429d-9ea9-b31145e5d9e5
Pollnau, M.
1094856b-791a-4050-98d9-c07777d5f0f5
Salathé, R.-P.
5938ed79-bfef-4f6f-bd1b-cdf0b69af659
Borca, C.N., Apostolopoulos, V., Gardillou, F., Limberger, H.G., Pollnau, M. and Salathé, R.-P.
(2007)
Buried channel waveguides in Yb-doped KY(WO4)2 fabricated by femtosecond laser irradiation.
[in special issue: Photon-Assisted Synthesis and Processing of Functional Materials — E-MRS-H Symposium]
Applied Surface Science, 253 (19), .
(doi:10.1016/j.apsusc.2007.02.106).
Abstract
We report on the fabrication of optical channel waveguides inside KY(WO4)2 crystals, both undoped and Yb-doped, for applications in compact solid-state lasers and three-dimensional photonic devices. Nonlinear absorption of femtosecond laser pulses has been employed in order to induce refractive-index changes in these crystals. The irradiation damage results in a decrease of the material density compared to the surrounding bulk. In this work, two types of buried channel waveguides have been fabricated in the KY(WO4)2 crystals. First ones (type I) were formed in the vicinity of the irradiated regions due to the presence of an induced compressive lattice strain, which causes an increase of the local refractive index. Light can be better confined in the second (type II) of channel waveguides that are created between pairs of damaged regions. For the best confined channels (type II), the propagation loss value measured at 1 ?m amounted to 2–2.5 dB/cm.
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e-pub ahead of print date: 27 February 2007
Published date: 31 July 2007
Keywords:
femtosecond-laser writing, burried channel waveguides, KY(WO4)2 crystals
Identifiers
Local EPrints ID: 57099
URI: http://eprints.soton.ac.uk/id/eprint/57099
ISSN: 0169-4332
PURE UUID: 17779a39-17fe-4ca0-a3d5-656cb04f8f40
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Date deposited: 07 Aug 2008
Last modified: 16 Mar 2024 03:56
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Contributors
Author:
C.N. Borca
Author:
F. Gardillou
Author:
H.G. Limberger
Author:
M. Pollnau
Author:
R.-P. Salathé
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