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Effect of intrinsic surface roughness on the efficiency of intermodal phase matching in silica optical nanofibers

Effect of intrinsic surface roughness on the efficiency of intermodal phase matching in silica optical nanofibers
Effect of intrinsic surface roughness on the efficiency of intermodal phase matching in silica optical nanofibers
We investigate the effect of intrinsic surface roughness associated to frozen thermal oscillations from the fiber fabrication process on the efficiency of third-harmonic generation via intermodal phase matching in silica nanofibers. Already a periodic wave with roughness of 0.2 nm reduces the efficiency by roughly 50% in a 1-mm optical nanofiber, with the divergence growing quadratically with distance. The surface wave period does not exhibit a large impact on the efficiency, due to averaging effects. However, both the location of the surface waves with respect to the phase matching radius as well as the surface wave amplitude have substantial effect on the efficiency, with the former presenting the possibility of transferring the power back to the pump wavelength. Simulations with a realistic superposition of random surface waves indicate that the conversion efficiency increases only for a few mm of propagation and reaches a maximum of less than 1%.
0146-9592
1318-1321
Abdul Khudus, Muhammad I.M.
17127b8f-cde4-4c11-aca0-3c9151a42d94
Lee, Timothy
beb3b88e-3e5a-4c3f-8636-bb6de8040fcc
Horak, Peter
520489b5-ccc7-4d29-bb30-c1e36436ea03
Brambilla, Gilberto
815d9712-62c7-47d1-8860-9451a363a6c8
Abdul Khudus, Muhammad I.M.
17127b8f-cde4-4c11-aca0-3c9151a42d94
Lee, Timothy
beb3b88e-3e5a-4c3f-8636-bb6de8040fcc
Horak, Peter
520489b5-ccc7-4d29-bb30-c1e36436ea03
Brambilla, Gilberto
815d9712-62c7-47d1-8860-9451a363a6c8

Abdul Khudus, Muhammad I.M., Lee, Timothy, Horak, Peter and Brambilla, Gilberto (2015) Effect of intrinsic surface roughness on the efficiency of intermodal phase matching in silica optical nanofibers. Optics Letters, 40 (7), 1318-1321. (doi:10.1364/OL.40.001318).

Record type: Article

Abstract

We investigate the effect of intrinsic surface roughness associated to frozen thermal oscillations from the fiber fabrication process on the efficiency of third-harmonic generation via intermodal phase matching in silica nanofibers. Already a periodic wave with roughness of 0.2 nm reduces the efficiency by roughly 50% in a 1-mm optical nanofiber, with the divergence growing quadratically with distance. The surface wave period does not exhibit a large impact on the efficiency, due to averaging effects. However, both the location of the surface waves with respect to the phase matching radius as well as the surface wave amplitude have substantial effect on the efficiency, with the former presenting the possibility of transferring the power back to the pump wavelength. Simulations with a realistic superposition of random surface waves indicate that the conversion efficiency increases only for a few mm of propagation and reaches a maximum of less than 1%.

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Accepted/In Press date: 21 February 2015
e-pub ahead of print date: 20 March 2015
Published date: 1 April 2015
Organisations: Optoelectronics Research Centre

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Local EPrints ID: 376851
URI: https://eprints.soton.ac.uk/id/eprint/376851
ISSN: 0146-9592
PURE UUID: 41e3f043-9520-4a32-8dc7-bdeffff87265
ORCID for Peter Horak: ORCID iD orcid.org/0000-0002-8710-8764

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Date deposited: 11 May 2015 10:30
Last modified: 20 Nov 2018 01:34

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Contributors

Author: Muhammad I.M. Abdul Khudus
Author: Timothy Lee
Author: Peter Horak ORCID iD

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