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Buried channel waveguides in Yb-doped KY(WO4)(2) fabricated by femtosecond laser irradiation

Record type: Article

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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Citation

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), pp. 8300-8303. (doi:10.1016/j.apsusc.2007.02.106).

More information

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

Catalogue record

Date deposited: 07 Aug 2008
Last modified: 17 Jul 2017 14:29

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Contributors

Author: C.N. Borca
Author: V. Apostolopoulos
Author: F. Gardillou
Author: H.G. Limberger
Author: M. Pollnau
Author: R.-P. Salathé

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