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Work Package 4: Development of low loss dielectric coatings for advanced detectors
• Scientific motivation: Mechanical dissipation from dielectric mirror coatings is predicted to be a significant source of thermal noise for advanced detectors. Coatings must also be of low optical loss.
- Main workpackage outcomes/long term aim: Definition of a low-mechanical-loss optical coating
design/production process suitable for advanced detectors operating at either room or cryogenic temperatures
- Groups involved: Institute for Gravitational Research, University of GlasgowLaboratoire des Matériaux Avancés, (LMA) LyonsAURIGA group, Laboratori Natzionali di Legnaro (+Leiden/Rome)Materials group, VIRGO, PerugiaESPCI, Laboratoire d'Optique, Paris
Work Package 4: Development of low loss dielectric coatings for advanced detectors
Milestones Year 1 Report from Glasgow Group (IGR)
4.1 - Production of the first SiO2/Ta2O5 and SiO2 /Al2O3 coatings
Status: Coatings procured from REO and Waveprecision.
Deliverables Year 14.2 - Loss measurements on SiO2 /Ta2O5 at room T Status: Given the availability of results from work by the LIGO project on
SiO2/Ta2O5 we chose to pursue studies of Al2O3/Ta2O5 coatings (relevant for use with sapphire mirror substrates)We have previous experimental measurements which we are re-
analysing in greater depth for this project given our new work on FEA and improved interpretation of sources of coating dissipation.
This work is continuing as planned.
4.3 - Loss measurements on SiO2 /Al2O3 at room T Status: A SiO2/Al2O3 coating on sapphire has been procured – we plan to
carry out measurements of the coating mechanical loss. This work is continuing as planned.
Facility to measure the Q of coated membranes realized under theEGO R&D program and delivered to Lyon
Report from INFN Perugia
The Michelson Morley Interferometer
Data analysis program
Preliminary measurements in Perugia for clamping design
Work Package 4: Development of low loss dielectric coatings for advanced detectors
Milestones of STREGA proposal for next year:
• Milestone Year 2 production of first SiO2 /high index material
• Deliverables Year 2 measurements on silica substrate
identification of diffraction coating production process
Scientific plan for next year:
• Some EGO funding is approved for coating research - LMA Lyons • We propose
– Substrates to be provided by collaborating STREGA institutions – Thin ‘membranes’ to be used initially for fast test measurements (INFN
Perugia)
Work Package 4: Development of low loss dielectric coatings for advanced detectors
Scientific plan for next year, cont.
- Smaller number of larger ‘mirror-like’ samples for further study in more realistic configurations INFN Perugia, Glasgow (participation by Legnaro/Leiden/Rome)
- Move over coming year to study coatings on some silicon substrates (for use at 1064nm initially)
- Choice of specific coatings – doping etc – subject of near future discussion – propose WP4 meeting in Lyons
• Costs an issue..