Infrared Optical Crystal
Zinc Selenide (ZnSe)
High-transmission material optimized for mid-infrared
Zinc Selenide is a widely used infrared optical material optimised for mid-infrared transmission. It is commonly specified for thermal imaging systems, infrared windows, and CO₂ laser optics due to its good optical clarity and manufacturability. ZnSe is softer than oxide materials and is best used where mechanical abrasion is limited.
Is this material right for your application?
Use When:
Mid-IR transmission is required
Thermal imaging or sensing systems are used
CO₂ laser optics are involved
Optical clarity is prioritised over hardness
Moderate environmental exposure is expected
Avoid When:
Visible or UV transmission is required
High surface hardness or abrasion resistance is needed
Severe mechanical shock is expected
Weight is a critical constraint
Consider Alternatives:
Germanium (Ge) – higher refractive index for compact optics
Zinc Sulphide (ZnS) – improved mechanical strength
KRS-5 – broader IR transmission for spectroscopy
Explore Related Optical Materials
Chalcogenide Glass
Float Zone Silicon (FZ-Si)
Zinc Sulphide (Multispectral)
Material specifications and frequently asked questions
FAQ
Q1. What wavelength range does ZnSe cover?
ZnSe has broad reference transmission from approximately 0.6 to 20 µm and is especially useful in the infrared.
Q2. Is ZnSe suitable for CO₂ laser optics?
Yes. ZnSe is widely used for optics operating around 10.6 µm.
Q3. Is ZnSe mechanically robust?
It is moderately durable but softer than many oxide optical materials and should be handled carefully.
Q4. What are common alternatives to ZnSe?
Germanium, Silicon and ZnS may be considered depending on spectral and environmental requirements.
Excellent transmission in the mid-IR.
Susceptible to scratching without coatings.
Widely used for windows and lenses in IR systems.