Power spectral density analysis of optical substrates for gravitational-wave interferometry
| Autor: | Achim J. Leistner, Bozenko F. Oreb, Christopher J. Walsh |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Physics
business.industry Scattering Gravitational wave Materials Science (miscellaneous) Astrophysics::Instrumentation and Methods for Astrophysics Spectral density Industrial and Manufacturing Engineering Spectral line LIGO Interferometry Optics Optical transfer function Spatial frequency Business and International Management business |
| Zdroj: | Applied optics. 38(22) |
| ISSN: | 1559-128X |
| Popis: | The power spectral density of surface-relief variations on polished optical surfaces across microscopic through to macroscopic spatial scales is calculated from measurements on substrates that are being produced for the Laser Interferometer Gravitational-Wave Observatory (LIGO). These spectra give a guide to the scattering properties of the surface, which in turn critically influence the performance of LIGO. Measurements obtained by use of a full-aperture interferometer and an interference microscope with two different objectives are combined to produce one-dimensional power spectral density representations of the surfaces across spatial frequencies ranging from 0.1 to 8000 cm(-1). These measurements from different instruments are in good agreement with an analytic power spectrum that varies as nu(-1.5), where nu is the spatial frequency. Some anomalies in the power spectral density spectra can be related to aspects of the polishing process. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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