405 nm Narrow Bandpass Optical Filter

The 405 nm narrow bandpass optical filter is a high-performance bandpass filter specifically designed for optical applications at the 405 nm wavelength. It efficiently transmits the target band of 400-410 nm while providing deep blocking of outofband stray light, effectively improving the signaltonoise ratio, wavelength selectivity, and detection accuracy of optical systems. Manufactured with highquality hard dielectric multilayer coatings, the filter features high transmittance, deep blocking, excellent spectral stability, and good environmental durability, meeting the needs of highperformance spectral filtering in research, industrial, and biomedical applications. The filter achieves an average transmittance greater than 87% over the 400-410 nm band, and provides blocking of OD5 or higher over the ranges of 350-391.5 nm and 418.5-850 nm, effectively suppressing background light and adjacent wavelength interference. It supports an incident angle of 0°± 5°and a cone halfangle of 7°, and is offered in a standard 25 mm round form with an effective clear aperture of ≥21 mm, facilitating compatibility with various optical systems and standard mounts. With outstanding filtering performance, stable coating quality, and reliable longterm operation, the 405 nm narrow bandpass optical filter is widely used in 405 nm laser systems, fluorescence microscopy, confocal microscopy, flow cytometry, Raman spectroscopy, biomedical detection, machine vision, precision optical instruments, and other optical systems requiring highselectivity wavelength filtering.