Astigmatism compensation in mode-cleaner cavities for the next generation of gravitational wave interferometric detectors

Interferometric gravitational wave detectors use triangular ring cavities to filter spatial and frequency instabilities from the input laser beam. The next generation of interferometric detectors will use high laser power and greatly increased circulating power inside the cavities. The increased pow...

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Bibliographic Details
Published inPhysics letters. A Vol. 340; no. 1; pp. 1 - 6
Main Authors Barriga, Pablo J., Zhao, Chunnong, Blair, David G.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 06.06.2005
Subjects
Astigmatism
Gravitational waves
Mode-cleaner
Thermal lensing
42.15.Eq
Mode-cleaner
04.80.Nn
Gravitational waves
Thermal lensing
Astigmatism
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Summary:Interferometric gravitational wave detectors use triangular ring cavities to filter spatial and frequency instabilities from the input laser beam. The next generation of interferometric detectors will use high laser power and greatly increased circulating power inside the cavities. The increased power inside the cavities increases thermal effects in their mirrors. The triangular configuration of conventional mode-cleaners creates an intrinsic astigmatism that can be corrected by using the thermal effects to advantage. In this Letter we show that an astigmatism free output beam can be created if the design parameters are correctly chosen.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2005.03.042