ZnSe Windows

Zinc selenide (ZnSe) windows is a premium optical solution for a broad spectrum of infrared applications. Fabricated via chemical vapor deposition technology, this infrared ZnSe window features uniform refractive index, high transmittance and low absorption coefficient, making it an ideal choice for high-definition infrared optical systems. It is also widely recognized as the benchmark material for CO2 laser optics thanks to its outstanding thermal stability.

Description

Key Advantages

Ultra-wide Infrared Transmittance Band
Extremely low infrared absorption, low thermal effect and non-deformation
High laser-induced damage threshold
Excellent optical uniformity and no birefringence
Easy to machine and form
Good chemical stability

Zinc Selenide (ZnSe) Material Properties

Material	Zinc Selenide, ZnSe
Transmission Range	0.6 - 21.0 μm
Refractive Index (@10.6 μm)	2.4028
Density	5.27 g/cm³
Coefficient of Thermal Expansion(CTE)	7.57 x 10⁻⁶ /°C
Thermal Conductivity	18 W/(m·K) @ 298K
Knoop Hardness	105-120 kg/mm²
Absorption Coefficient(@10.6 μm)	0.0005 cm⁻¹
Young's Modulus	67.2 GPa
Poisson's Ratio	0.28

Processing Specifications

Parameters	Regular	High precision
Dimension	Φ5mm-Φ300mm
Diameter Tolerance	±0.05mm	±0.02 mm
Thickness Tolerance	±0.1mm	±0.02 mm
Parallelism (arcmin)	<1′	<10″
Surface Quality	60-40	20-10
Surface Flatness (P-V)	PV< λ/2@632.8nm	PV<λ/10@632.8nm
Coating	Custom AR, BBAR
Specifications	According to customer's specific requirements

Application Fields:

Visible to LWIR Full Spectrum (Multispectral ZnSe)
- Dual-band visible-infrared sighting lenses
- Aerospace multi-spectrum monitoring optical parts
0.6–18μm Broad Infrared
- Spectroscopy measurement optical substrates
- Laboratory FTIR spectrometer windows & prisms
3–5μm Mid-Wave Infrared
- High-temperature furnace infrared observation windows
- MWIR gas analyzers & hydrocarbon detection sensors
10.6μm CO₂ Laser Band (Core Application)
- CO₂ laser cutting/marking machine output windows
- Laser engraving, medical laser surgical optics
- Industrial laser beam expanders & focusing lenses

ZnSe Windows

Description

Application Fields:

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