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Determination of refractive indices from the mode profiles of UV-written channel waveguides in LiNbO3-crystals for optimization of writing conditions

Determination of refractive indices from the mode profiles of UV-written channel waveguides in LiNbO3-crystals for optimization of writing conditions
Determination of refractive indices from the mode profiles of UV-written channel waveguides in LiNbO3-crystals for optimization of writing conditions
We report on a method for the simultaneous determination of refractive index profiles and mode indices from the measured near-field intensity profiles of optical waveguides. This method has been applied to UV-written single-mode optical waveguides in LiNbO3 for the optimization of the writing conditions. The results for the waveguides written with light of the wavelengths 275, 300.3, 302, and 305 nm for different writing powers and scan speeds reveal that for optimum writing conditions a maximum possible refractive index change of ~ 0.0026 can be achieved at a value of 632.8 nm transmitting wavelength. The computation process used in the presented technique may also become useful to extract absolute refractive index values of any slowly varying graded index waveguide.
0733-8724
3490-3497
Ganguly, Pranabendu
64ababc4-0ffe-4de9-8b27-48647cb02f6b
Sones, Collin Lawrence
9de9d8ee-d394-46a5-80b7-e341c0eed0a8
Ying, Yongjun
ae6d9cc8-5a75-4441-9a53-8d0c67baac40
Steigerwald, Hendrik
979c014a-c7d1-4821-a7d5-617ff740448c
Buse, Karsten
405820e8-6e61-4848-ba0d-c5fe9a4c8158
Soergel, Elisabeth
f2f3cfe9-687e-48e9-9166-606087aba7f4
Eason, Robert William
e38684c3-d18c-41b9-a4aa-def67283b020
Mailis, Sakellaris
233e0768-3f8d-430e-8fdf-92e6f4f6a0c4
Ganguly, Pranabendu
64ababc4-0ffe-4de9-8b27-48647cb02f6b
Sones, Collin Lawrence
9de9d8ee-d394-46a5-80b7-e341c0eed0a8
Ying, Yongjun
ae6d9cc8-5a75-4441-9a53-8d0c67baac40
Steigerwald, Hendrik
979c014a-c7d1-4821-a7d5-617ff740448c
Buse, Karsten
405820e8-6e61-4848-ba0d-c5fe9a4c8158
Soergel, Elisabeth
f2f3cfe9-687e-48e9-9166-606087aba7f4
Eason, Robert William
e38684c3-d18c-41b9-a4aa-def67283b020
Mailis, Sakellaris
233e0768-3f8d-430e-8fdf-92e6f4f6a0c4

Ganguly, Pranabendu, Sones, Collin Lawrence, Ying, Yongjun, Steigerwald, Hendrik, Buse, Karsten, Soergel, Elisabeth, Eason, Robert William and Mailis, Sakellaris (2009) Determination of refractive indices from the mode profiles of UV-written channel waveguides in LiNbO3-crystals for optimization of writing conditions. Journal of Lightwave Technology, 27 (16), 3490-3497. (doi:10.1109/JLT.2009.2015963).

Record type: Article

Abstract

We report on a method for the simultaneous determination of refractive index profiles and mode indices from the measured near-field intensity profiles of optical waveguides. This method has been applied to UV-written single-mode optical waveguides in LiNbO3 for the optimization of the writing conditions. The results for the waveguides written with light of the wavelengths 275, 300.3, 302, and 305 nm for different writing powers and scan speeds reveal that for optimum writing conditions a maximum possible refractive index change of ~ 0.0026 can be achieved at a value of 632.8 nm transmitting wavelength. The computation process used in the presented technique may also become useful to extract absolute refractive index values of any slowly varying graded index waveguide.

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Published date: 15 August 2009
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 70947
URI: https://eprints.soton.ac.uk/id/eprint/70947
ISSN: 0733-8724
PURE UUID: 77aca933-af9a-45d6-9a5b-7d27458ac42b
ORCID for Robert William Eason: ORCID iD orcid.org/0000-0001-9704-2204
ORCID for Sakellaris Mailis: ORCID iD orcid.org/0000-0001-8100-2670

Catalogue record

Date deposited: 11 Mar 2010
Last modified: 06 Jun 2018 13:13

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Contributors

Author: Pranabendu Ganguly
Author: Yongjun Ying
Author: Hendrik Steigerwald
Author: Karsten Buse
Author: Elisabeth Soergel

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