The University of Southampton
University of Southampton Institutional Repository

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

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).

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.

Full text not available from this repository.

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


Local EPrints ID: 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

Export record



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

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton:

ePrints Soton supports OAI 2.0 with a base URL of

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.