Germanium Ge
Standard grade and high-purity single-crystal grade for LWIR thermal imaging windows and infrared detection covers.
Germanium Infrared Window
Germanium infrared window is a passive infrared optical component for 8-14um LWIR transmission, thermal camera front protection, infrared detection modules and low-power sensing equipment. Felix Glass manufactures custom Ge infrared windows with precision polishing, controlled flatness, parallelism and application-specific IR anti-reflection coating. A germanium infrared window is a high-refractive-index optical substrate used to transmit long-wave infrared energy while protecting the detector, lens assembly or sensor cavity behind it. It is mainly selected for passive LWIR systems rather than high-power CO2 laser optics. Substrate selection depends on wavelength, power level, impact exposure, temperature and inspection requirements. Germanium is prioritized when the system is passive and requires stable LWIR imaging performance. ZnSe supports active CO2 laser optics, while ZnS can be considered for cost-sensitive basic infrared detection. Sapphire is recommended when the operating environment needs higher temperature tolerance or impact resistance. Final drawings define the controlled tolerances. The values below are common engineering reference ranges for custom germanium optical window projects. Ultra-precision cutting and contour forming for brittle germanium substrates. Low-stress fine grinding and infrared optical polishing for imaging stability. Low-temperature sputtering helps reduce oxidation risk and reflection loss. Dimensional tolerance and LWIR spectral transmittance verification before delivery.
Germanium Infrared Window Engineering Hub
Custom Germanium Infrared Window for Passive LWIR Thermal Imaging and Infrared Detection
What Is a Germanium Infrared Window?
8-14um LWIR transmission band
Optical-grade single-crystal Ge option
AR, BBAR and hard protective coatings
Germanium Infrared Window Material Options for B2B Optical Assemblies
ZnSe and ZnS
Sapphire Alternative
Typical Germanium Optical Window Technical Specifications
Substrate Material Grade Optical grade single-crystal germanium Operating Wavelength 8000nm-14000nm LWIR thermal imaging band Custom Diameter 3mm-220mm Custom Thickness 0.8mm-18mm Surface Quality 20/10, 40/20, 60/40 MIL-O-13830 Surface Flatness lambda/10 to lambda/20 at 633nm Parallelism Up to 1 arcsec Available Coatings IR AR, IR BBAR, hard protective anti-reflection coating
Custom Germanium Infrared Window Manufacturing Capability
CNC Blank Forming
Precision Polishing
Vacuum Coating
Batch Testing
0 results
ViewShowcase
Germanium surfaces have high reflection and can oxidize in humid exposure, so coating selection is not cosmetic. It directly affects signal transmission, image stability and service life in passive infrared optical assemblies. Reduces surface reflection and improves infrared signal transmission for thermal camera windows. Supports broader infrared detection bands when the system needs multi-spectrum response. Adds oxidation resistance for outdoor monitoring, inspection and long-term sensing equipment. Felix Glass positions germanium infrared windows for passive systems where detector protection, low background emission and repeatable transmittance are more important than laser power handling. Evaluate size, wavelength, coating, mounting and environmental requirements. Select germanium purity grade and AR, BBAR or hard protective coating stack. Produce samples for geometry, transmittance and application performance checks. Complete full geometric, spectral and coating verification before sealed optical packing. Every custom order can be supported with inspection documents for dimensional tolerance, surface quality, coating performance and LWIR spectral transmittance. They are mainly used in passive LWIR thermal imaging cameras, infrared temperature detection and sensing equipment. Germanium has a much higher refractive index for thermal imaging structures, while ZnSe is better for high-power CO2 laser optics. Yes. AR, BBAR or hard protective coatings reduce reflection and help isolate the substrate from humid air exposure. Yes. Felix Glass supports custom thicknesses starting from 0.8mm according to drawings for compact thermal cameras. Yes. Reports can include spectral transmittance, dimensional inspection and coating performance certification. Upload drawings or specify wavelength, size, thickness, coating and equipment application requirements. Felix Glass will review the structure and provide a practical custom Ge infrared window solution evaluation.
IR Coating Solutions for Germanium Infrared Windows
IR AR Coating
IR BBAR Coating
Hard Protective Coating
LWIR Thermal Imaging Window Applications
Uncooled LWIR Thermal Cameras
Industrial Infrared Inspection
Medical and Semiconductor IR Systems
Custom Ge Infrared Window OEM Processing Workflow
01
Drawing Review
02
Material and Coating Confirmation
03
Prototype and Imaging Test
04
Batch Inspection and Packaging
Germanium Infrared Optical Window Quality Inspection Standards
Germanium Infrared Window FAQ for Engineering Buyers
What scenarios are germanium infrared windows suitable for?
What are the advantages of germanium compared with ZnSe?
Does germanium need protective coating?
Can ultra-thin germanium windows be customized?
Can batch test reports be provided?
Get a Custom Germanium Infrared Window Quote
Learn more from our FAQ
- What is your MOQ for custom optical glass and display glass parts?
Felix Glass offers highly flexible MOQ to support client projects, including prototype testing, small batch trial orders and large-volume mass production. All products can be fully customized according to your drawings, tolerances and application standards. Send us your specs to get an accurate price quote within 24 hours.
- Can I get free glass samples for testing before bulk order?
Yes, our FELIX GLASS factory supports sample testing for a wide range of precision optical glass components and assemblies. The lead time for sample production is 3 to 7 working days. Please contact us today to arrange samples and obtain a customized solution that meets your needs.
- What is the production lead time for custom optical glass components?
What is the production lead time for custom optical glass components?
Answer: The lead time for standard samples is 3–7 business days, while mass production takes 15–25 business days, depending on product complexity and order volume. We provide reliable, rapid delivery for orders serving the industrial, medical, automotive, and aerospace sectors. Please submit your project details to receive an accurate delivery schedule.
- Are your optical glass products ISO, CE and RoHS certified?
All FELIX GLASS precision optical glass components comply with ISO quality system standards, as well as CE and RoHS requirements. We provide comprehensive test reports, material certificates, and inspection documentation for customer review. Please feel free to request full certification details and a formal quotation today.
- Do you offer one-stop custom optical glass processing services?
Yes. We provide a full range of in-house processing services, including CNC machining, precision grinding, optical polishing, vacuum coating (AR, AF, AG, IR), tempering, and screen printing. Every step—from raw material to finished product—is carried out within our own facility. Please let us know your requirements, and we will provide you with the most cost-effective solution.
CONTACT US NOW FOR A QUOTE
Send an inquiry now—we will respond promptly within 1–24 hours and provide our best formal quote within 1–2 days! Let’s start a mutually beneficial partnership today...
- Name
- *Title
- *Content
