Steve Penn, Gregg Harry (MIT)

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Presentation transcript:

Steve Penn, Gregg Harry (MIT) Coating Loss Measurements on Thin Fused Silica Substrates LIGO-G020119-00-Z Steve Penn, Gregg Harry (MIT) Sasha Ageev, Andri Gretarrson, Scott Kittleberger, Luis Lopez, Peter Saulson Syracuse University

Syracuse University Experimental Relativity Group Outline Goals of Coating Loss Experiment Plan for Coating Measurements on Thin Substrates Thin Substrate Experimental Set-up & Sources of Loss Modifications for Future Coatings Work LSC • March 2002 Syracuse University Experimental Relativity Group

Review of Coating Program Levin (1998) showed coatings could be a limiting source of loss. Preliminary measurements at Glasgow and Syracuse indicated coating  2.5 x 10-4  Test Mass Q’s  107 Advanced LIGO requires coating  10-5 for Sapphire masses and 200 Mpc range. Coating program initiated: Thin Substrates with birefringent readout (Syracuse & MIT) Thick Substrates with interferometric readout (Glasgow & Stanford) LSC • March 2002 Syracuse University Experimental Relativity Group

Thin Substrate Measurements Uncoated, Super-polished Disks (Mindrum & Wave Precision), Q = 6–20 million Annealed, Uncoated, Superpolished Disks, Q 45 million Coated Disk, 2-layers, (l/4 Ta2O5, l/4 SiO2) Q 9 million Coated Disk, 30-layers, (l/4 Ta2O5, l/4 SiO2) Q 500,000 Coated Disk, 30-layers, (3l/8 Ta2O5, l/8 SiO2) Q 400,000 Coated Disk, 60-layers, (l/8 Ta2O5, l/8 SiO2) Q 500,000 LSC • March 2002 Syracuse University Experimental Relativity Group

Syracuse University Experimental Relativity Group LSC • March 2002 Syracuse University Experimental Relativity Group

Syracuse University Experimental Relativity Group LSC • March 2002 Syracuse University Experimental Relativity Group

Syracuse University Experimental Relativity Group LSC • March 2002 Syracuse University Experimental Relativity Group

Benefits of the Thin Disk Method Geometry enhances DQ due to coatings ( factor 40) Suspension methods (welding, collet & bob) are low loss Tiny ( 100 mm) welds do not disturb coatings (DT  0) In-air feedback allows for mode identification Birefringence Readout has high SNR & clean analysis Excellent Agreement of Results between labs LSC • March 2002 Syracuse University Experimental Relativity Group

Effect of the Isolation Bob LSC • March 2002 Syracuse University Experimental Relativity Group

Annealed, Uncoated Disk LSC • March 2002 Syracuse University Experimental Relativity Group

Syracuse University Experimental Relativity Group LSC • March 2002 Syracuse University Experimental Relativity Group

Syracuse University Experimental Relativity Group LSC • March 2002 Syracuse University Experimental Relativity Group

Syracuse University Experimental Relativity Group LSC • March 2002 Syracuse University Experimental Relativity Group

Thin Disk Method for Sapphire? Benefits of low cost, fast turn-around, and low noise measurements. Problems with attachment Bonding not preferable due to loss Is welding sapphire possible? Even if possible, amorphous weld would likely have higher loss. Develop a TAMA-like suspension using pins holding the sample edges LSC • March 2002 Syracuse University Experimental Relativity Group

Syracuse University Experimental Relativity Group F vs V/S — Part I Flame drawn fibers only LSC • March 2002 Syracuse University Experimental Relativity Group

Syracuse University Experimental Relativity Group F vs V/S — Part II Add non-fiber samples LSC • March 2002 Syracuse University Experimental Relativity Group

Syracuse University Experimental Relativity Group F vs V/S — Part IV Add flame polished disk LSC • March 2002 Syracuse University Experimental Relativity Group