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Telescope Mirror and Lens Materials

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Pyrex Glass

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Low thermal expansion coefficient; used for making mirror substrates because it maintains its shape as temperatures change.

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Borosilicate Glass

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Resistant to thermal shock; more affordable alternative to Pyrex, often used in amateur telescopes.

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Zerodur

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Nearly zero thermal expansion; used for large telescope mirrors that require very stable figures to maintain high optical quality.

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Fused Silica (Quartz)

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Very low thermal expansion and excellent optical properties; used in space telescopes and high precision optics where stability and clarity are critical.

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ULE Glass (Ultra-Low Expansion Glass)

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Extremely low thermal expansion; ideal for use in space telescopes and other instruments requiring precision over a wide temperature range.

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Calcium Fluoride

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Low dispersion and high transmission from UV to infrared; used in specialty lenses and as a substrate for coatings in refracting telescope objectives.

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Silicon Carbide

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High strength-to-weight ratio; used for lightweight telescope mirror substrates, particularly for space-based applications.

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Beryllium

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Low density and high thermal stability; used for lightweight mirrors in space and military telescopes where weight and quick thermal response are critical.

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Magnesium Fluoride

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Low refractive index and high resistance to thermal and physical shocks; used for anti-reflective coatings on lenses and sometimes as the lens material itself.

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Aluminum

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Good reflectivity, inexpensive, and easy to shape; commonly used with a protective and enhancing coating for primary telescope mirrors.

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