CaltechAUTHORS
Published June 23, 2016 | Version public
Journal Article Metadata-only

The effect of time on optical coating mechanical loss and implications for LIGO-India

Creators

  • 1. ROR icon American University
  • 2. ROR icon California Institute of Technology
  • 3. ROR icon Hobart and William Smith Colleges

Abstract

We report on the persistence of mechanical loss with time of ion beam sputtered dielectric coatings made from alternating layers of Ta_2O_5 and SiO_2 deposited onto fused silica substrates. From this, we predict the coating thermal noise in gravitational wave interferometers, after the coated optics have been stored for years. We measured the modal mechanical quality factor, Q, of two coated fused silica samples in 2015. These samples also had their modal Q's measured in 2002. We conclude that storing the coated silica disks for 13 years does not change their mechanical loss and thus the storage of Advanced LIGO gravitational wave detector optics until their future installation in India will not degrade their achievable thermal noise.

Additional Information

© 2016 IOP Publishing Ltd. Received 23 March 2016, revised 9 May 2016; Accepted for publication 23 May 2016; Published 23 June 2016. This research was funded by the US National Science Foundation under grant number PHY-1453252. This paper has been assigned LIGO Document Number LIGO-P1600076.

Additional details

Identifiers

Eprint ID
69168
Resolver ID
CaltechAUTHORS:20160722-131601191

Funding

NSF
PHY-1453252

Dates

Created
2016-07-22
Created from EPrint's datestamp field
Updated
2022-07-12
Created from EPrint's last_modified field

Caltech Custom Metadata

Caltech groups
LIGO , Physics Department
Other Numbering System Name
LIGO Document
Other Numbering System Identifier
LIGO-P1600076