📐 Optical Specifications
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Diameter: 1.0″ (25.4 mm) with a tolerance of +0.0 / −0.1
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Thickness: 6.0 mm (0.24″) ±0.2 mm
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Reflectance:
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Average reflectance > 97 % in the 450 nm to 2 µm range.
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95 % for 2–20 µm spectral range
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Surface Flatness: λ/10 at 633 nm, Surface Quality: 40‑20 scratch‑dig.
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Parallelism: <3 arcmin.
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Clear Aperture: >90 % of diameter
⚡ Damage Threshold & Coating
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Coating: Protected silver with an SiO₂ overcoat to reduce oxidation and enhance durability
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Laser Damage Threshold:
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Pulsed: ~0.225 J/cm² at 800 nm (99 fs pulse), ~1 J/cm² at 1064 nm (10 ns pulse).
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CW: up to 500 W/cm at ~1.07 µm, and ~1500 W/cm at 10.6 µm
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