BG39 is an ionically colored blue cut glass optical filter glass designed to transmit visible light while effectively attenuating ultraviolet (UV) and near-infrared (NIR) radiation. This characteristic makes it a practical solution for ensuring "visible-only" operation in cameras and optical instruments.
As a bulk-absorptive colored glass, BG39 offers thickness-dependent tunability in both spectral slope and blocking depth.
Significance in imaging applications: Silicon-based image sensors typically exhibit sensitivity up to approximately 1100 nm. Without proper filtering, unregulated NIR radiation can penetrate into the RGB channels, leading to color distortion. BG39 mitigates this issue by suppressing NIR transmission relative to the visible spectrum. It is commonly used in conjunction with UV/IR-cut filters when precise spectral confinement within the 400–700 nm range is required.
In summary, BG39 integrates visible-range transmission, UV/NIR attenuation, angle-stable spectral performance, and compatibility with standard mounting configurations. These features collectively establish it as a dependable solution for camera modules, machine vision systems, spectroscopic instruments, and illumination optics.
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