Zinc Selenide (ZnSe)
High-transmission material optimized for mid-infrared
Infrared Optical Crystal
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:
Avoid When:
Consider Alternatives:
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
Visible or UV transmission is required
High surface hardness or abrasion resistance is needed
Severe mechanical shock is expected
Weight is a critical constraint
Germanium (Ge) – higher refractive index for compact optics
Zinc Sulphide (ZnS) – improved mechanical strength
KRS-5 – broader IR transmission for spectroscopy
Key Properties
Optical
High transmission in the mid-infrared
Low absorption at CO₂ laser wavelengths
Mechanical
Relatively soft compared to oxide materials
Thermal / Environmental
Moderate thermal conductivity
Limited abrasion resistance
Explore Related Optical Materials
Frequently asked questions about Barium Fluoride specifications and use-cases
FAQ
Q1. What wavelength range does ZnSe cover?
ZnSe transmits from ~600 nm to ~21 µm.
Q2. Is ZnSe suitable for CO₂ lasers?
Yes. ZnSe is a standard material for CO₂ laser optics.
Q3. Is ZnSe mechanically robust?
Moderately. It is softer than oxide glasses and must be handled carefully.
Q4. What are alternatives to ZnSe?
Germanium, Silicon, and ZnS.
Excellent transmission in the mid-IR.
Susceptible to scratching without coatings.
Widely used for windows and lenses in IR systems.