690 nm Narrow Bandpass Optical Filter

The MP-NBP-690 is a high-performance narrow bandpass optical filter with a center wavelength of approximately 690 nm. Employing multi-layer dielectric thin-film interference technology, it provides high transmittance with an average transmission >90% over the 686-694 nm band, while offering segmented high optical density blocking across the 300-1100 nm range. This effectively suppresses out-of-band stray light and background noise, thereby enhancing system signal-to-noise ratio and detection sensitivity. The filter has a full width at half maximum (FWHM) of 12 nm, making it suitable for optical systems that demand high wavelength selectivity and spectral purity. It supports an incident angle of 0°±5° and a cone half‑angle of 7°, features an effective clear aperture of ≥22 mm, and adopts a standard Ø25 mm circular form factor for easy integration into various optical assemblies and instruments. Additionally, the product exhibits excellent optical stability and light resistance, and is widely applicable in fluorescence detection, bioimaging, spectral analysis, laser detection, machine vision, and research instrumentation.