The 905 nm bandpass filter is a precision optical component that allows only an extremely narrow band around 905 nm to pass while deeply blocking other wavelengths. It is typically manufactured using magnetron sputtering or ion source-assisted hard coating processes, with a center wavelength locked at 905 nm ± 2 nm and customizable bandwidth (commonly 10 nm or 60 nm). Its transmittance exceeds 90%, and the blocking depth reaches OD4-OD6 (corresponding to over 99.99% ambient light suppression). Due to the maturity, low cost, and stable atmospheric transmission of 905 nm laser technology, this filter has become a core component in systems such as MEMS solid-state LiDAR, laser rangefinders, barcode scanners, facial recognition, and medical imaging. It significantly enhances signal-to-noise ratio, suppresses background light interference, and enables high-precision detection over distances exceeding 200 m.