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Sapphire Infrared Window 25.4mm 3-5um MWIR Thermal Imaging Camera Grade
Product Specification
Place of Origin:
Guangdong, China
Brand Name:
ECER Optics
Certification:
ISO 9001:2015
Model Number:
SW-IR-MWIR
Minimum Order Quantity:
10 Pieces
Price:
USD 8-50 / Piece
Payment Terms:
T/T,PayPal,Western Union
Supply Ability:
30000 Pieces per Month
Product Details
Highlight:
Sapphire Infrared Window
,Thermal Imaging Camera Window
,3-5um MWIR Optics
Product Name:
Sapphire Infrared Window
Application:
Thermal Imaging Camera
Spectral Range:
3-5um MWIR
Material:
Single Crystal Sapphire
Transmission:
>85% Uncoated 3-5um
Diameter:
Custom 5mm - 100mm
Surface Quality:
40-20 Scratch-Dig
Coating:
MWIR AR Optional
Product Description
Sapphire Infrared Window 25.4mm 3-5um MWIR Thermal Imaging Camera Grade
This sapphire infrared window is engineered for thermal imaging cameras operating in the 3-5μm mid-wave infrared band, where sapphire is the established material of choice. The window transmits above 85% in the 3-5μm range without coating, and with an optional MWIR anti-reflective layer, transmission rises above 93%, maximizing the signal that reaches the thermal detector. For uncooled and cooled thermal imaging systems alike, a sapphire infrared window protects the delicate sensor while preserving the thermal contrast that drives detection performance.
The sapphire substrate is grown as a single crystal, which gives the thermal imaging window uniform refractive index, low scatter, and consistent performance across the full aperture. Each window is polished to a 40-20 scratch-dig surface quality and verified for IR transmission with a spectrophotometer before release. The thermal imaging camera window is available in diameters from 5mm to 100mm with custom thickness, edge profiles, and mounting features such as counterbores or through-holes. Our team also supports system designers with coating selection for 3-5μm, 8-12μm dual-band, or laser protection applications.
Technical Specifications
| Product Name | Sapphire Infrared Window for Thermal Imaging |
|---|---|
| Spectral Range | 3-5μm MWIR |
| Material | Single Crystal Sapphire |
| Transmission | >85% Uncoated, >93% AR Coated 3-5μm |
| Diameter | Custom 5mm - 100mm |
| Thickness | 0.5mm - 5.0mm Custom |
| Surface Quality | 40-20 Scratch-Dig |
| Coating | MWIR AR Optional |
| Application | Thermal Imaging Camera |
| Certificate | RoHS Compliant, ISO 9001:2015 |
Applications
- Uncooled and cooled thermal imaging cameras
- Infrared surveillance and security systems
- Firefighting thermal cameras
- Industrial thermography and condition monitoring
- Automotive night vision systems
- Thermal weapon sights and targeting optics
- Gas detection and environmental monitoring
- Research IR spectroscopy instruments
Thermal imaging systems are only as good as the window in front of the sensor, because any absorption or scatter in the window directly reduces the temperature resolution of the camera. This sapphire infrared window is therefore specified with measured IR data rather than calculated values, and the same substrate lot is used within each production batch to keep refractive index consistent. For high volume camera programs, the sapphire infrared window can be supplied with pre-applied gaskets or adhesive-ready surfaces, reducing assembly time. Field experience across surveillance, industrial, and automotive programs confirms that single crystal sapphire maintains its IR transmission and surface quality over years of outdoor exposure.
Product Q&A
Q: Why is sapphire the preferred material for 3-5μm windows?
Sapphire combines high transmission in the 3-5μm band with extreme hardness and thermal stability, which are exactly the properties an infrared window needs on a camera exposed to weather, vibration, and cleaning. Germanium and zinc selenide transmit IR but are soft and fragile, while sapphire survives field use without compromising MWIR performance.
Q: What is the difference between coated and uncoated IR transmission?
Uncoated sapphire transmits above 85% at 3-5μm because of surface reflection losses. A dedicated MWIR AR coating reduces reflection and raises transmission above 93%. We can supply either version, and the uncoated option is common for cost-sensitive or broadband applications.
Q: Can you make a sapphire infrared window with mounting holes?
Yes. In addition to plain round windows, we machine counterbores, through-holes, stepped edges, and custom outer profiles for direct mounting into camera housings. Share your mechanical drawing and we will produce the thermal imaging window ready for assembly.
Q: How is IR transmission verified before shipment?
Every batch is measured with an FTIR spectrophotometer across the 2-12μm range, and the measured transmission data is included with the shipment. Surface quality and dimensional checks are performed on 100% of parts.
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