Use

Where the crystal
actually works.

ZnSe is a binary II–VI with a job list, not a personality. These are the jobs we quote substrate for.

CO₂ lasers — 10.6 µm

Focusing lens, output window or F-theta. Laser grade: bulk absorption < 0.0005 cm⁻¹ @ 10.6 µm (KM datasheet). Dual-band AR if a 633 nm HeNe rides the same path.

Thermal imaging — 8–12 µm

Camera windows and elements. Optical grade unless the print says resonator. Different AR than a cutting head.

FTIR / spectroscopy

Broadband windows when the bench spans mid-IR and you can live with a soft crystal. Uncoated unless you specify.

Cutting, marking & F-theta

The crystal in the beam path, not the machine. F-theta lenses for scan heads: laser grade, AR 10.6 µm. Optical grade does not belong here.

Medical IR paths

Substrate for diagnostic and process optics. We are not a medical-device manufacturer and we do not claim ISO 13485.

Defense & rangefinding

Illuminators, rangefinders, telescope optics. ITAR and end-use on the paperwork when they apply — ask, do not assume.

Evaporation & sputtering

KM also supplies ZnSe as evaporation material and sputtering target. Same crystal, different form — say so on the RFQ.

Process-chamber windows

IR viewports on vacuum and process tools. Optical grade unless a laser is going through the same port. Write the atmosphere and the band.

Pyrometry & process IR

Looking at a hot process through a ZnSe window. Uncoated or a camera AR — not a CO₂ dual-band unless the print says so.

10.6 µm beam delivery

Relay windows and expanders in a CO₂ path. Laser grade. AR 10.6 µm. Optical grade does not belong in that line.

IR sample cells

Liquid and gas cells on an IR bench. Soft crystal — plan the seal and the clean, not a glass recipe.

Large-aperture IR

Plates exist because CVD makes area. KM datasheet maximum Ø800 × 30 mm T. Send the clear aperture, not a hope.

KM grows its own H₂Se on site in Gwangju, runs CVD blanks up to Ø800 × 30 mm, and holds finished stock in Florida for US delivery.