Silicon (Si) Optical Wedge Prism / Wedged Window — Czochralski (CZ) / Float Zone (FZ) Grade
Specifications
Element Type: Optical Wedge / Wedged Window (Circular)
Substrate Material: Monocrystalline Silicon — CZ (Czochralski, 10–40 Ω·cm) standard; FZ (Float Zone, >1000 Ω·cm) or HRFZ available
Refractive Index: n ≈ 3.4223 @ 5 µm; n ≈ 3.4178 @ 10 µm; n ≈ 3.60 @ 632.8 nm (alignment reference)
Typical Diameter: 10 mm / 12.7 mm (½") / 25.4 mm (1") (custom Ø5–100 mm+ available)
Diameter Tolerance: +0.00 / –0.20 mm
Typical Thickness (at thick side): 2.0 / 3.0 / 5.0 mm (customizable)
Thickness Tolerance: ±0.10 mm
Wedge Angle: 0.5° (30 arcmin) / 1° / 2° / 3° / 5° standard (0.25°–10° on request)
Wedge Angle Tolerance: ±10 arcmin (±3′–±15′ tighter available)
Surface Flatness: λ/4 @ 632.8 nm (λ/10 over central CA optional)
Surface Quality: 40-20 or 20-10 Scratch-Dig (per MIL-PRF-13830B)
Clear Aperture: > 90% of diameter
Transmission Range: 1.2–7 µm (CZ/FZ, uncoated); up to 12 µm (thin FZ); 1.2 µm–THz (HRFZ)
Absorption Band: Si–O band at ~9 µm (CZ grade; absent in FZ/HRFZ)
Coating Options: Uncoated / BBAR both sides – 1.5–6 µm / 2–4 µm (MWIR) / 3–5 µm (Ravg <1%) / DLCC diamond-like carbon protective coat
