HWB850 Infrared Black Glass Window

Material: HWB850

Dimensions: 140-150 × 80-90 mm (+0 / -0.1 mm)

Thickness: 3 ± 0.05 mm

Surface Figure: ?/4 per 25 mm aperture

Parallelism: 2 arcminutes

Surface Quality: 60/40

Clear Aperture: 90%

PV: = 3? per 25 mm aperture (? = 633 nm or 1550 nm)

RMS: = 0.5? (? = 633 nm or 1550 nm)

Coating: Double-sided hydrophobic + AR coating

Transmittance: Tavg < 1% @ 400–700 nm

Reflectance: R < 0.3% @ 1550 nm

This is a precision optical window manufactured from HWB850 infrared-transmitting black glass material. It features a rectangular form factor of 150×88mm with a thickness controlled to 3±0.05mm. The product incorporates dual-sided functional coatings: an anti-reflective (AR) coating on the inner surface and a hydrophobic (water-repellent) coating on the outer surface. These coatings ensure an average transmittance of less than 1% in the visible spectrum (400–700nm), effectively blocking visible light, while achieving a residual reflectance of less than 0.3% at the 1550nm near-infrared wavelength, enabling high-efficiency infrared transmission.