South Korea

The reactor
is the product.

KM Innovation grows CVD ZnSe in South Korea. Florida quotes and ships.

Growth

How the crystal is grown

CVD: Zn vapor + H₂Se on a hot mandrel. The photograph is the closed reactor. Laser grade is bulk absorption at 10.6 µm; optical grade is imaging scatter. Mandrel temperature and H₂Se rates stay off this page.

Schematic: published CVD-ZnSe chemistry. Photographs: the plant floor.

How does ZnSe grow?

Chemical vapor deposition, not a melt. The published reaction used for bulk IR ZnSe (Miles et al., DTIC ADA042147, 1977) is:

Zn (g) + H₂Se (g) → ZnSe (s) + H₂ (g)

Zinc vapor meets hydrogen selenide at a hot mandrel. The solid that deposits is polycrystalline ZnSe. KM datasheet: grain < 100 µm; bulk absorption < 0.0005 cm⁻¹ at 10.6 µm.

What is inside the reactor?

The photograph is the closed vessel during a run. The line drawing is a textbook schematic of the published reaction.

How does it become a part?

After the run the deposit is a polycrystalline plate. Then grind, water-jet (SMTY, min. +1.5 mm oversize) and core. Datasheet maximum Dia 800 × 30 mm T. Real photos: stock, water-jet nest, windows on the slab.

Laser grade vs optical grade?

Same CVD ZnSe. Laser grade is bulk absorption at 10.6 µm (KM datasheet < 0.0005 cm⁻¹) for CO₂. Optical grade is imaging, thermal and spectroscopy. Grade is on the quotation and CoC. AR does not change bulk absorption.

Real · closed CVD reactor, South Korea. This is the view during a run.

Real · process / gas hall, South Korea.

Illustrative only — not KM Innovation internals

Illustrative schematic of the published bulk CVD-ZnSe reaction. Chemistry: Miles et al., DTIC ADA042147 (1977). Not KM mandrel geometry, not KM cycle time, not a photograph of the inside of the KM furnace.

After the run · real sequence

1 · Feed

Zn vapor + H₂Se. KM introduction (2023.06): Se 99.999%, H₂ 99.995%.

→

2 · Closed reactor

Published reaction on a mandrel. Real photo: closed vessel. No interior cutaway.

→

3 · Plate → part

Datasheet max Dia 800 × 30 mm T. Then grind / water-jet / core. Grade on the quote.

Real · inventory after the cut.

Real · windows cored from the deposit.

Same chemistry. Grade is a specification, not a second crystal.

Laser grade

CO₂ / 10.6 µm

Specified around bulk absorption at 10.6 µm. KM datasheet: < 0.0005 cm⁻¹. Use when the print says resonator, cutting head, focusing lens or 10.6 µm AR. Coating sits on the surface; bulk absorption is the crystal.

Optical grade

Imaging / thermal / FTIR

Same CVD ZnSe chemistry. Specified for imaging and thermal use (scatter / homogeneity), not as a CO₂ resonator. Use when the print says camera window, 8–12 µm, FTIR or viewport. Lot data on the CoC.

Lot absorption or index against a serial is quoted when QA asks. Grade note with cited tables →

Literature growth rates (not KM lead times) are cited on the fabrication note. The plant films below are from the plant after the run, not a generated interior.

Plant films