HWB780 is a "front-cut, rear-pass" near-infrared absorption filter made of black glass, which allows high transmission of light ≥780 nm while strongly absorbing visible and shorter wavelengths, serving to purify the infrared signal. Standard dimensions are Φ25 mm×2 mm, with a transmittance >90%, featuring low reflection, low fluorescence, and good thermal stability. It operates over a wide temperature range and is resistant to fading or deformation. Primarily used in security surveillance night vision, LiDAR, infrared imaging, fiber optic communication, scientific experiments, and infrared photography, it effectively blocks stray light, protects privacy, and enhances the system's signal-to-noise ratio.