CVD zinc selenide windows on a grown slab

KM innovation USA

CVD ZnSe
for 10.6 µm.

Large US inventory. Fast delivery.

Windows, SMTY and cores in Florida stock.

Request a Quote How ZnSe grows

KM Innovation ZnSe transmittance versus wavelength, 6.3 millimetre thickness, from the factory datasheet — KM datasheet · 6.3 mm

Bulk absorption: <5×10⁻⁴ cm⁻¹ @ 10.6 µm
Refractive index: 2.403 @ 10.6 µm
Chemical purity (KM sheet): >99.999 %
Maximum size: Dia 800 × 30 mm
KM plot: 2–25 µm at 6.3 mm

Published CVD rates · 50–127 µm/h · furnace-on

A 30 mm plate is weeks in the furnace.

Quality CVD is slow: 50–70 µm/h (RU2253705C1) or 127 µm/h laser-quality (ADA042147, 0.005 in/h). Faster deposition is how scatter and absorption rise. 30 mm at 50 µm/h is ~25 days furnace-on.

Published chemistry. Heat-up, cool-down and grind are extra.

Plate thickness 30 mm

5 mm30 mm · KM datasheet max

Published quality rate (slow first)

—Furnace-on hours if that rate holds

—Same number in days

Default 50 µm/h: 30 mm ≈ 600 h (~25 days) furnace-on. 60 µm/h ≈ 21 days. 127 µm/h ≈ 10 days. Literature rates, not a quoted lead time. KM max Dia 800 × 30 mm T.

1 · Grow

Quality CVD is the slow window: ~650–750 °C (Gavrishchuk), 50–70 µm/h (RU2253705C1), or ~127 µm/h laser-quality (ADA042147). Density 5.27 g/cm³. Grain in the ADA042147 table ~70 µm. Polycrystalline plate, not a melt boule.

2 · Cut

After the run: grind, water-jet (SMTY min. +1.5 mm) and core. Florida quotes inspected KM parts.

3 · Work as an optic

n = 2.403 at 10.6 µm (KM datasheet). Uncoated Fresnel loss ≈ 17% per face. That is why CO₂ resonators specify AR — and why laser grade is the 10.6 µm absorption number, not the color of the disc.

Sources: RU2253705C1 (50–70 µm/h) · ADA042147 (0.005 in/h laser-quality) · KM ZnSe datasheet. Real plant photographs: Factory.

KM Innovation USA — Florida stock of CVD ZnSe. Grade, size and coating on the quotation.

KM Innovation · ZnSe