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

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Description/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 μm amounted to 2–2.5 dB/cm.

Item Type: Article
ISSNs: 0169-4332 (print)
Keywords: femtosecond-laser writing, burried channel waveguides, KY(WO4)2 crystals
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: University Structure - Pre August 2011 > School of Physics and Astronomy
ePrint ID: 57099
Date Deposited: 07 Aug 2008
Last Modified: 27 Mar 2014 18:39
URI: http://eprints.soton.ac.uk/id/eprint/57099

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