Dongguan Felix Glass Co., Ltd. E-mail: james@felixglass.com - Tel: +86 185 6503 2888
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high transmittance germanium ir window With AR+DLC Dual Protective Coating

high transmittance germanium ir window With AR+DLC Dual Protective Coating
high transmittance germanium ir window With AR+DLC Dual Protective Coatinghigh transmittance germanium ir window With AR+DLC Dual Protective Coatinghigh transmittance germanium ir window With AR+DLC Dual Protective Coatinghigh transmittance germanium ir window With AR+DLC Dual Protective Coatinghigh transmittance germanium ir window With AR+DLC Dual Protective Coatinghigh transmittance germanium ir window With AR+DLC Dual Protective Coating
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CategoriesZnSe Infrared Lens
BrandFELIX GLASS optical glass Manufacturing base
ModelFG-GE-WIN-AR-DLC
MaterialHigh-purity single crystal Germanium (Ge)
Working Spectrum8–14μm LWIR long-wave infrared
Surface CoatingDouble-sided AR+DLC dual composite coating
Optical CharacteristicFully opaque to visible light, stray light suppression
Core Application FieldThermal imaging, industrial IR temperature measurement, security monitoring
FOB portSHENGZHEN SHANGHAI GUANGZHOU
Terms of PaymentL/C, D/A, D/P, Western Union
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Detail Information

High IR Transmittance Single Crystal Germanium Protective Window With AR+DLC Dual Coating

 
Felix Glass germanium ir window is made of high-purity single crystal germanium substrate, the core optical material for 8–14μm long-wave infrared thermal imaging systems. Germanium features ultra-low absorption within LWIR band, completely blocks visible light to avoid stray light interference, and delivers stable thermal performance for continuous industrial infrared detection.
 
Dual composite coating of AR anti-reflection film + DLC diamond-like carbon hard film is deposited on both surfaces. AR coating maximizes long-wave infrared transmittance, while DLC layer provides high hardness scratch, moisture and oxidation resistance, solving the soft substrate defect of bare germanium and extending service life in harsh outdoor environments. Flat polished plane ensures no optical distortion for thermal imaging sensor detection.
 

Core Optical Specifications

 
- Base Material: Single crystal germanium (Ge)
- Main Working Band: 8 μm – 14 μm long-wave infrared (LWIR)
- Coating Structure: Dual-side AR anti-reflection coating + DLC hard protective coating
- Average Transmittance: >90% @8–14μm after AR+DLC coating
- Single-Surface Reflectance: <1.3% within target LWIR spectrum
- Visible Light Performance: 100% opaque to 0.4–0.7μm visible light, eliminate visible stray light
- Shape: Custom round, square, rectangular flat window
- Thickness Range: 1mm ~ 12mm customizable
- Surface Quality: Standard 60-40 scratch-dig, upgradeable to 40-20 high precision
- Operating Temperature: -40℃ ~ +120℃ stable thermal performance

 

Core Product Advantages

 
1. Single crystal germanium substrate with ultra-low LWIR absorption, excellent long-wave infrared light throughput for thermal imaging
2. Dual AR+DLC composite coating, combines high transmittance and hard scratch/moisture protection, solves soft Ge substrate wear problem
3. Naturally blocks all visible light, effectively suppress visible stray light interference to improve thermal imaging picture purity
4. Flat ultra-precision polished surface, no beam distortion, stable detection precision for long-distance temperature measurement
5. Fully customizable outline, thickness and coating spectrum to match industrial thermal camera, night vision and infrared spectrometer systems
6. Stable thermal expansion coefficient, no surface deformation under continuous high-temperature industrial detection load
 

Typical Application Scenarios

 
- Vehicle-mounted LWIR night vision thermal imaging cameras
- Industrial online high-temperature infrared temperature measurement equipment
- Security perimeter thermal detection surveillance cameras
- Handheld infrared thermal imagers & thermal monoculars
- Laboratory 8–14μm Fourier transform infrared spectrometers
- Mining, metallurgy high-temperature infrared monitoring optical windows

 

OEM Manufacturing Capability

 
We provide full one-stop germanium optical processing including single crystal blank cutting, ultra-precision flat polishing, dual AR+DLC composite coating, edge deburring, strict 8–14μm spectral transmittance testing and surface hardness inspection.
Prototype sampling, small-batch trial production and mass manufacturing are supported. Every AR+DLC coated germanium window is fully tested to meet customer-specified spectral, dimensional and coating hardness requirements before delivery.
 

 FAQ

 
1. What is the function of AR+DLC dual coating on germanium window?
AR coating reduces infrared surface reflection to improve 8–14μm transmittance; DLC diamond-like carbon hard film increases surface hardness, resisting scratch, water vapor and oxidation to protect soft germanium substrate.
2. Why germanium instead of ZnSe for pure long-wave thermal imaging?
Germanium fully blocks visible light to eliminate stray light interference, ideal for single-band LWIR thermal imaging; ZnSe transmits visible light, only suitable for multi-spectrum dual-band systems.
3. Can I customize window size and coating parameters?
Yes, we support custom round/rectangular outline, thickness, and AR+DLC coating optimized for 8–14μm long-wave infrared thermal imaging wavelength.
4. What equipment matches this AR+DLC coated germanium protective window?
It fits vehicle night vision thermal cameras, industrial online temperature measuring equipment, handheld thermal imagers and laboratory LWIR infrared spectrometers.
5. Do you offer sample and mass production for germanium infrared optics?
We supply prototype sampling, small trial batches and large-scale manufacturing, all germanium windows pass full spectral transmittance and surface hardness inspection before shipment.


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Custom Precision Optical & Glass Components Manufacturer – Felix Glass Co., Limited.

We supply Industrial Glass, Sapphire Optics, Optical Lenses/Prisms/Filters, Infrared IR Optics, Functional & Display Glass, N-BK7/H-K9L Optical Glass, supporting OEM mass production and laboratory custom prototypes. Flexible MOQ & free sample service available. Fill in the form to download full datasheets and get factory wholesale price within 24 hours.

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Learn more from our FAQ
What is the minimum order quantity for custom precision optical glass components?

FELIX OPTICAL GLASS offers highly flexible MOQs to support customer projects, including prototype testing, small-batch trial orders, and high-volume production. All products can be fully customized to your drawings, tolerances, and application standards. Please send us your specifications, and we will reply within 1-5 hours and provide an accurate quotation after careful evaluation within 1-2 days.

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?

A: The production cycle for standard samples is 3-10 working days, while mass production requires 15-35 working days, depending on the complexity of the product and the order quantity. We provide reliable precision optical glass components and fast delivery services for orders from industries such as defense, industrial equipment, medical devices, shipbuilding, robotics, automotive, and aerospace. Please submit your project details so we can provide you with an accurate delivery schedule.

Are your optical glass products ISO, CE and RoHS certified?

All precision optical glass components from FELIX OPTICAL GLASS comply with ISO quality system standards as well as CE and RoHS requirements. We provide comprehensive test reports, spectral graphs, material certificates, and inspection documents for customer review. Please feel free to request complete certification details and a formal quotation at any time.

Do you offer one-stop custom optical glass processing services?

Yes. We offer a full range of precision optical glass component processing services, including CNC machining, precision grinding, optical polishing, chemical/physical tempering, vacuum coating (AR anti-reflective coating, AF anti-fingerprint coating, AG anti-glare coating, IR infrared coating), and screen printing. From raw materials to finished products, every step is completed in our own factory. Please tell us your needs, and we will provide you with the most cost-effective solution.

CONTACT US NOW FOR A QUOTE
We will respond promptly within 1 to 5 hours and provide an optimal, formal quotation within 1 to 2 days. Partnering with us is the smartest choice—start a mutually beneficial partnership today!
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With 19 years of experience as a precision optical glass expert, we provide comprehensive and satisfactory customized solutions.

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