PRODUCTS

Multispectral Infrared Optical Windows

QIR Optics supplies ZnS windows designed for applications requiring broad spectral transmission combined with strong mechanical durability.

ZnS is widely used in laboratory instrumentation, sensing systems, and multispectral optical platforms where performance across multiple wavelength ranges is critical.

Typical Specifications

• Diameter: Standard and custom sizes available 
• Thickness: Standard and custom options 
• Surface Quality: 60-40 standard / 40-20 optional 

Optical Properties

• Transmission range: Visible to ~12 µm (grade dependent) 
• Improved mechanical durability compared to ZnSe 

Coating Options

• Broadband anti-reflective (AR) coatings 
• Custom wavelength-specific coatings 

Applications

• Multispectral optical systems 
• Laboratory instruments 
• Infrared sensing platforms 

Example Part

ZnS Window — 25.4 mm Dia × 3.0 mm Thick, AR Coated

Infrared Windows for LWIR Applications

QIR Optics supplies precision Germanium (Ge) windows optimized for long-wave infrared (LWIR) transmission in the 8–14 µm range.

Germanium is a preferred material for thermal imaging, sensing, and spectroscopy due to its high refractive index and excellent infrared transmission.

Typical Specifications

• Diameter: Standard and custom sizes available 
• Thickness: Standard and custom options 
• Surface Quality: 60-40 standard / 40-20 optional 
• Flatness / Parallelism: Available upon request 

Optical Properties

• Transmission range: ~2 µm to 14 µm 
• Refractive index: ~4.0 @ 10 µm 

Coating Options

• AR coating optimized for 8–12 µm (LWIR) 
• Custom coatings available 

Typical Performance:

• Reflectance: ≤0.5% per surface (AR coated) 

Applications

• Thermal imaging systems 
• Infrared sensing 
• Spectroscopy      
• Industrial monitoring 

Example Part

Germanium Window — 25.4 mm Dia × 3.0 mm Thick, AR Coated @ 10 µm