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Close-up image of an optical surface coated with an anti-reflection layer, displaying a high-contrast gradient of light reflection. The surface transitions from deep black in the upper left to a warm, soft amber tone in the lower right, with a subtle blue highlight intersecting diagonally. The lighting and reflection suggest precise optical coating, possibly on glass or crystal, used in advanced photonic or optical applications.

UV, VIS, NIR Anti-Reflective: Extended Band Coatings

Engineered for night vision technology, the Extended Band Anti-Reflective Coating minimizes reflectance in goggles, enhancing optical clarity across a spectral range of 520nm to 950nm, meeting MIL-M-13508C, MIL-C-675A, and MIL-C-14806A standards for durability.

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Product description

Specially designed to maintain low reflectance in the object lens assembly of night vision goggles, these innovative coatings significantly enhance optical clarity and performance across a wide spectral bandwidth, paving the way for clear, unobstructed views in low-light conditions. This process utilises plasma assisted electron beam deposition to provide durable and environmentally stable coatings. The unique designs offer low absorption, wide bandwidth and relative insensitivity to angle of incidence, while sophisticated process control ensures run to run reproducibility and maximum yield.

Operating over a spectral bandwidth of 520nm to 950nm, our Extended Band Anti-Reflection Coatings offer an exceptional single-surface average reflectance of less than 0.3%. This greatly reduces glare and maximizes the transmission of available light, allowing for superior visual clarity in night vision applications. Furthermore, the single-surface maximum reflectance across the same spectral range is kept below 0.6%, ensuring a consistent, high-quality visual experience.

But the benefits of our Extended Band Anti-Reflection Coatings extend beyond superior visual performance. They also offer versatility. The spectral bandwidth over which the coating operates can be optimized for other spectral regions, such as 420 to 850nm. This makes these coatings a highly adaptable solution for a wide range of optical needs.

Designed to withstand the toughest environments, our Extended Band Anti-Reflection Coatings are suitable for glasses with a refractive index of 1.48 to 1.88. They comply with the exacting environmental conditions set out in MIL-M-13508C para 4.4.6, MIL-C-675A, MIL-C-675A para 4.6.8, and MIL-C-14806A, ensuring durability, resilience, and reliable performance even under extreme conditions.

Applications

  • Night vision technology

Key Metrology

  • UV, VIS, and IR spectrometers
  • 4 point conductivity probe
  • MIL standard temperature and humidity chambers

Key Equipment & Processes

  • Thin-film design including bespoke HUD design software
  • PVD, CVD, and IBS coating platforms
  • Laser test to MILT-DTL-62422
  • TS1888 DLC test bench

Key features

  • Spectral bandwidth of 520nm to 950nm
  • Single-surface maximum reflectance across the same spectral range is kept below 0.6%
  • Bandwidth versatility
  • Extremely rugged
  • Low reflection and absorption loss
  • Plasma assisted deposition for thermal and environmental stability
  • Manufacturing in the UK and US

Specifications

NameValue
Anti-reflection coating425-1000nm: <0.6% average, 425-1000nm: <1.2% max
Operating temperature-40 to 200°C Adhesion, abrasion resistance

Specifications

  • Single surface average reflectance 520nm to 950nm <0.3%
  • Single surface maximum reflectance 520nm to 950nm <0.6%
  • Suitable for glasses of refractive index 1.48 to 1.88

Substrates

  • Clear optical glass
  • Filter glass
  • Ceramic glass
  • Sapphire
  • Polycarbonate (including dip-coated visors)
  • Nickel-plated Aluminium
  • Nickel-plated Beryllium
  • Active Devices

Conformance

  • MIL-M-13508C para 4.4.6
  • MIL-C-675A
  • MIL-C-675A para 4.6.8
  • MIL-C-14806A
  • MIL-C-48497
  • MIL-STD-810B

  • G&H | Artemis Typical Reflectance Curve for Single Surface N-SK16 (n=1.61)

    Graph titled "Typical reflectance curve for single surface N-SK16 (n=1.61)" showing reflectance percentage on the Y-axis (0–5%) and wavelength in nanometers on the X-axis (450–1000 nm). The curve begins high around 5% reflectance at 450 nm, drops sharply to below 1% near 500 nm, and then flattens into a low, stable region around 0.2–0.4% across the remainder of the spectrum.

  • G&H | Phoenix Extended Band Coating

    Extend band coating graph, A line graph titled "Extended band a-r 420–1000 nm" shows % Reflectance on the y-axis (ranging from 0 to 5%) and Wavelength (nm) on the x-axis (ranging from 400 to 1050 nm). A red curve indicates reflectance across the wavelength range, starting high near 5% at 400 nm and quickly dropping below 1% by 430 nm. The reflectance stays relatively low (generally under 1%) with small oscillations throughout the visible and near-infrared spectrum. Reflectance gradually increases again beyond 1000 nm, peaking above 3% at 1050 nm. The graph demonstrates the effectiveness of an anti-reflective (AR) coating across an extended wavelength band

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