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Part 68-307 is a 5 mm diameter, UV enhanced aluminum coated first-surface mirror.
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Substrate: Fused Silica.
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Coating: UV-enhanced aluminum. Reflectivity (R_avg) > 89% @ 250–450 nm, and > 85% @ 250–700 nm.
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Thickness: ~ 2.00 mm.
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Surface flatness: λ/10. (Part of the TECHSPEC λ/10 mirror family.)
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Parallelism: Surface S2 (back) to S1 (front) is ≤ 30 arcsec.
Typical Uses
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Precision beam steering.
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Optical folding (compact optical paths).
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Instruments needing high-quality reflection in the UV/visible range.
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Interferometry, alignment, or lab-based optical setups requiring very flat mirrors.



