Design of a Lightweight Mounted Tip/Tilt Mirror

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Presentation transcript:

Design of a Lightweight Mounted Tip/Tilt Mirror Mike Borden OPTI 523 4/6/09

Design Problem 4: Large Mirror Mount

To Do List Type of lightweight Mirror material and coating Linear actuator Mount and flexure design

Lightweighting Contoured Back Sandwich, and Open Back

Lightweighting

Lightweighting

Mirror Material Considerations Main materials being considered High stiffness to weight Ease of manufacture Minimal thermal stresses Cost Main materials being considered ULE, Zerodur, Fused Silica, Beryllium, Aluminum, BK7

Mirror Material

Mirror Materials

Mirror Material Possibilities Pure Beryllium mirror Expensive and difficult to manufacture Thermal considerations non-issue Fused Silica, BK7, Aluminum substrate w/ silver coating Aluminum w/ silver coating provides smallest ∆𝛂 (23 ppm / K and 18.9 ppm/ K) Thermal expansion / contraction an issue Something crazier – Copper, Brass, Beryllium Copper, Stainless

Optical Specifications Silver Coating Meets spectrum requirements

Optical Specifications Error Budget – 30 nm rms WFE Mirror surface roughness (∆S) 20 nm rms Self weight deflection (δ) Beam diameter 200 mm diameter mirror accommodates 150 mm beam diameter

Mounting Concept

Mounting Concept

Mounting Concept Invar Sleeve Spherical Bearing Micrometer

Remaining Tasks Verify number of supports Reflectance of Be Tolerance bearings for thermal loading Flexure design – dimensions, material FEA analysis of deflection / thermal loading, resonant frequency Linear actuator / micrometer selection