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Germanium IR Window With Dual DLC+AR Coating, Single Crystal Ge Optical Window For LWIR Thermal Imaging

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Categories	IR Optical Dome
Brand	FELIX GLASS optical glass Manufacturing base
Model	FG-GE-WIN-DLCAR
Material	Single crystal Germanium (Ge)
Coating	8–14μm AR anti-reflection coating + DLC diamond-like carbon hard protective coating
FOB port	SHENGZHEN SHANGHAI GUANGZHOU
Terms of Payment	L/C, D/A, D/P, Western Union
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Single Crystal Germanium IR Optical Window With DLC+AR Dual Coating For Thermal Imaging

Felix Glass germanium infrared window is processed from high-purity single crystal germanium, the core optical substrate dedicated to 8–14μm long-wave infrared thermal imaging equipment. Germanium material features extremely low absorption coefficient in the LWIR band, and fully blocks visible light to eliminate stray light interference, ensuring pure thermal imaging picture without light noise.

Dual composite DLC+AR coating is deposited on both surfaces of the window. The broadband AR anti-reflection film optimizes transmittance for 8–14μm thermal infrared to maximize infrared signal throughput; the outer DLC diamond-like carbon hard film greatly improves surface hardness, resisting scratches, moisture and oxidation, solving the defect of soft bare germanium substrate that is easy to wear. Ultra-precision double-sided polishing ensures flat optical surface without beam distortion, stable long-distance thermal detection accuracy.

Core Optical Specifications

- Raw Material: High-purity single crystal Germanium (Ge)

- Main Working Spectrum: 8 μm – 14 μm long-wave infrared (LWIR)

- Coating Structure: Double-sided AR anti-reflection coating + DLC hard protective coating

- Average Transmittance: >90% within 8–14μm after DLC+AR coating

- Single-Surface Reflectance: <1.3% at target thermal infrared band

- Visible Light Shielding: 100% opaque to 0.4–0.7μm visible light, block ambient stray light

- Available Shape: Custom round, square, rectangular flat window

- Thickness Range: 1mm ~ 12mm customizable

- Surface Quality: Standard 60-40 scratch-dig, upgradeable to high precision 40-20

- Stable Operating Temperature: -40℃ ~ +120℃

Core Product Advantages

1. Single crystal germanium substrate with ultra-low LWIR absorption, excellent infrared light throughput for thermal imaging sensors

2. Dual DLC+AR composite coating, integrates high infrared transmittance and hard scratch/moisture protection, extend service life in harsh industrial environments

3. Natural visible light isolation characteristic, completely filter ambient visible stray light, improve thermal imaging contrast and clarity

4. Ultra-flat polished surface, no optical distortion, stable detection precision for long-distance industrial temperature measurement

5. Fully customizable outline, thickness and coating spectrum, match handheld thermal imager, vehicle night vision and online thermal monitoring equipment

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 portable infrared thermal imagers & thermal monoculars

- Laboratory 8–14μm Fourier transform infrared spectrometers

- Metallurgy, mining high-temperature infrared monitoring optical windows

OEM Manufacturing Capability

We provide full one-stop germanium optical processing including single crystal blank cutting, ultra-precision double-sided polishing, DLC+AR composite coating deposition, edge deburring, strict 8–14μm spectral transmittance testing and surface hardness inspection.

Prototype sampling, small-batch trial production and mass manufacturing are supported. Every DLC+AR coated germanium window is fully tested to meet customer-specified spectral, dimensional and coating hardness requirements before delivery.

FAQ

1. What are the functions of DLC and AR coating on germanium window respectively?

AR coating reduces surface reflection loss to raise 8–14μm infrared transmittance; DLC diamond-like carbon hard film increases surface hardness, protecting soft germanium substrate from scratch, water vapor and oxidation damage.

2. Why choose germanium instead of ZnSe for single-band thermal imaging?

Germanium fully blocks visible light to eliminate stray light interference, perfectly fit single-spectrum LWIR thermal imaging systems; ZnSe transmits visible light, only suitable for multi-spectrum dual-band optical systems with visible auxiliary alignment.

3. Can I customize the size and coating parameters of this germanium window?

Yes, we support custom round/rectangular outline, thickness, and DLC+AR coating optimized for 8–14μm thermal imaging wavelength range.

4. What thermal imaging equipment is this Ge window applicable to?

It matches vehicle night vision thermal cameras, industrial online temperature measuring equipment, handheld thermal imagers and laboratory LWIR infrared spectrometers.

5. Do you provide 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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What is the production lead time for custom optical glass components?: What is the production lead time for custom optical glass components?
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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.