Excess noise in low Fresnel number unstable resonators

Mcdonald, GS ORCID: https://orcid.org/0000-0002-1304-5182, New, GHC and Woerdman, JP 1999, 'Excess noise in low Fresnel number unstable resonators' , Optics Communications, 164 (4-6) , pp. 285-295.

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Numerical calculations of excess noise factors in low Fresnel number unstable resonators are described in detail. Computed mode profiles in one transverse dimension together with associated Petermann K-factors are presented; dynamical considerations such as injected wave excitation are also examined. The properties of the zero-order modes are consistent with virtual source theory and with a simple formula for K based on a geometrical optics approximation. While virtual source theory is asymptotic, we find that it can make good predictions for Fresnel numbers as low as unity. Full numerical calculations are however needed to determine accurate mode profiles and K-factors in some regimes. A new technique for calculating accurate higher-order mode profiles is also developed and this is employed to evaluate K-factor dependencies of the first two higher-order even modes.

Item Type: Article
Themes: Energy
Media, Digital Technology and the Creative Economy
Subjects outside of the University Themes
Schools: Schools > School of Computing, Science and Engineering > Salford Innovation Research Centre
Journal or Publication Title: Optics Communications
Publisher: Elsevier
Refereed: Yes
ISSN: 0030-4018
Depositing User: GS McDonald
Date Deposited: 14 Oct 2011 10:29
Last Modified: 15 Feb 2022 16:07
URI: http://usir.salford.ac.uk/id/eprint/18339

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