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A Stress Analysis of Sputter Coating on the LSST Primary-Tertiary Mirror

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A Stress Analysis of Sputter Coating on the LSST Primary-Tertiary Mirror

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    1. A Stress Analysis of Sputter Coating on the LSST Primary-Tertiary Mirror Substrate temperature and strain during sputter deposition of aluminum on cast borosilicate glass in a Gemini Observatory coating chamber by Jacques Sebag et al.

    2. Scientific Concepts of LSST 6 Band: 300nm-1.1µm Wide Field: f/1.25 viewing 9.62 deg2 (50x moon area) Camera: 3200 MP Data: 30 TB of data nightly

    3. Reflective Optical Coatings

    4. Common Coating Processes

    5. Evaporation vs. Sputtering

    6. Sputtering Procedure

    7. Monolithic Borosilicate Mirrors

    8. Temperature Stress

    9. Test System

    10. Temperature Measurements

    11. Temperature Extrapolation

    12. Strain Measurements

    13. Summary A Cast Borosilicate Mirror can be safely coated with Sputtering Deposition Techniques Max Temperature Variation below 5°C Resulting Stresses below 100psi Tensile Stress

    14. Questions?

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