Thermal distortions of non-Gaussian beams in Fabry Perot cavities

Details Thermal distortions of non-Gaussian beams in Fabry Perot cavities Thermal distortions of non-Gaussian beams in Fabry Perot cavities

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008cqgra..25w5016m&link_type=abstract

Classical and Quantum Gravity, Volume 25, Issue 23, pp. 235016 (2008).

Computer Science

1

Scientific paper

Thermal effects are already important in currently operating interferometric gravitational wave detectors. Planned upgrades of these detectors involve increasing optical power to combat quantum shot noise. We consider the ramifications of this increased power for one particular class of laser beams—wide, flat-topped, mesa beams. In particular we model a single mesa beam Fabry Perot cavity having thermoelastically deformed mirrors. We calculate the intensity profile of the fundamental cavity eigenmode in the presence of thermal perturbations, and the associated changes in thermal noise. We also outline an idealized method of correcting for such effects. At each stage we contrast our results with those of a comparable Gaussian beam cavity. Although we focus on mesa beams the techniques described are applicable to any azimuthally symmetric system.

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