Zinc Selenide
ZnSe
Our core material. Low-absorption CVD ZnSe for high-energy CO₂ lasers, thermal imaging and broadband infrared systems at 10.6 µm.
Used in
Industrial and medical CO₂ lasers, thermal imaging cameras, process-monitoring windows and full-scene infrared optics from 0.6 to 21 µm.
- Flagship process — two decades dedicated to ZnSe
- Diffractive elements: PV 0.134 µm, RMS 0.01 µm
- Largest clear apertures in the catalog, up to 400 mm
Capability
| Diameter | φ2 – 400 mm | |
|---|---|---|
| Scratch / Dig | 20 / 10 | 1300 Lux |
| PV | λ/8 @ 632.8 nm | Zygo |
| Irregularity | 0.1 λ @ 632.8 nm | Zygo |
| RMS | λ/50 @ 632.8 nm | Zygo |
| Parallelism / decentration | 3″ / 30″ |
Forms & coatings
Forms
- Windows (round / rectangular)
- Plano-convex, biconvex, meniscus lenses
- Prisms & wedges
- Aspheres & special shapes
- Diffractive optical elements
Coatings
- BBAR 8–12 µm
- BBAR 2–14 µm
- AR @ 2.94 µm
Curves are measured on 1–2 mm plane-parallel witness coupons.
Questions buyers ask
- Why is ZnSe used for CO₂ laser lenses?
- CVD zinc selenide has very low bulk absorption at 10.6 µm, high thermal shock resistance and a wide 0.6–21 µm window, so it is the standard substrate for CO₂ focusing lenses, output windows and F-theta scan lenses.
- What coating should I specify on a ZnSe window?
- For thermal cameras, BBAR 8–12 µm. For broadband instruments, BBAR 2–14 µm. For Er:YAG medical lasers, AR at 2.94 µm. We measure every run on plane-parallel witness coupons.
- What is the largest ZnSe optic THOI can polish?
- Catalog diameter is φ2–400 mm. Large-aperture windows use 1.2–2.0 m ring-polish tables; send the clear-aperture and wedge requirement with the RFQ.
Transmission windows
One factory, 0.4 to 21 µm
Pick a material by infrared band. Typical design windows overlay a log-scale spectrum from NIR through LWIR.
NIRSWIRMWIRLWIRFIR
0.4 µm2.558–1221 µm
- ZnSe0.6 – 21 µm
- ZnS0.4 – 12 µm
- Si1.2 – 7 µm
- ChG1 – 14 µm
Other substrates