Large-angle scattered light measurements for quantum-noise filter cavity design studies

Fabian Magaña-Sandoval, Rana X. Adhikari, Valera Frolov, Jan Harms, Jacqueline Lee, Shannon Sankar, Peter R. Saulson, Joshua R. Smith

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Optical loss from scattered light could limit the performance of quantum-noise filter cavities being considered for an upgrade to the Advanced Laser Interferometer Gravitational Wave Observatory (LIGO) gravitational-wave detectors. This paper describes imaging scatterometer measurements of the large-angle scattered light from two high-quality sample optics, a high reflector and a beamsplitter. These optics are each superpolished fused silica substrates with silica:tantala dielectric coatings. They represent the current state-of-the art optical technology for use in filter cavities. We present angle-resolved scatter values and integrate these to estimate the total scatter over the measured angles. We find that the total integrated light scattered into larger angles can be as small as 4 ppm.

Original languageEnglish (US)
Pages (from-to)1722-1727
Number of pages6
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Volume29
Issue number8
DOIs
StatePublished - Aug 2012

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Computer Vision and Pattern Recognition

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