Description
Ball Lens Bk7 K9 Optical Hemisphere Lens Dome Glass customized
Specifications (Ball Lens)
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Material: N-BK7 (K9 — nd = 1.5168 @ 587.6 nm; vd = 64.17) / UV Fused Silica on request
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Diameter (Ball Ø): 0.5 mm – 50 mm (common: Ø1.0 / Ø1.5 / Ø2.0 / Ø3.0 / Ø4.0 / Ø5.0 / Ø6.0 / Ø8.0 / Ø10.0 mm)
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Diameter Tolerance: ±0.01 mm (precision) / +0.00 / −0.05 mm (commercial)
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Sphericity (Roundness Error): ≤ 0.5 µm (precision balls); ≤ 1–2 µm (standard)
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Surface Quality: 60-40 / 40-20 / 20-10 Scratch-Dig (depending on size)
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Effective Focal Length (EFL): EFL = D · n / [4(n − 1)] ; e.g. for BK7 n≈1.517 → EFL ≈ 0.932 × D
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Clear Aperture: Full sphere (used on-center); practical NA ~0.3–0.5 depending on source
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Coating: Uncoated / MgF₂ / BBAR @ 400–700 nm / 630–680 nm / 780–1100 nm / V-coating
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Packaging: Loose in gel-pack / Vial / Tape-and-reel (for auto-insertion on request)
Basic Specifications (Hemispherical / Dome Lens)
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Material: N-BK7 (K9) / Fused Silica
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Dome Diameter (Planar Base Ø): 5 mm – 150 mm
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Dome Height (Sag): R (hemisphere) or custom sag per drawing (e.g. 0.5R, 0.7R, full dome)
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Radius of Curvature (ROC): = Base Ø / 2 (for true hemisphere)
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Substrate Thickness (Flat Side): Per design (typically 1–5 mm)
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Surface Quality: 60-40 / 40-20 Scratch-Dig
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Surface Irregularity (Spherical Side): λ/4 or λ/10 @ 632.8 nm
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Coating: Uncoated / BBAR (VIS / NIR / SWIR) / ITO (on request) / AR + hydrophobic
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Edge: Ground / beveled; optional edge blackening
