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427 nm Bandpass Filter
The MP-BPF-427 is a high-performance narrowband bandpass optical filter with a center wavelength of 427 nm. It is designed to transmit the target band with high transmittance while providing excellent out-of-band blocking across the ultraviolet and visible range. Manufactured with hard multi-layer dielectric coatings, this filter features high transmittance, high spectral stability, and excellent environmental durability. It is suitable for applications such as fluorescence detection, Raman spectroscopy, laser systems, biological imaging, microscopy, and scientific instrumentation.
Product features:Center wavelength 427 nm;Average transmittance > 93%;Full width at half maximum (FWHM) 14 nm;Minimum guaranteed bandwidth 10 nm;Designed for 0°angle of incidence;Hard dielectric coating, high stability
Part Number:MP-BPF-427
Application area:Fluorescence microscopy | Laser-induced fluorescence | Raman spectroscopy systems | Spectral detection equipment | CCD/CMOS camera filtering systems
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Laser Wavelength Transmission Band
427 nm Tavg > 93% 422 – 432 nm

Specification | Value |
Transmission Band | Tavg > 93% 422 – 432 nm |
Blocking Band | ODavg >5 200 – 275 nm |
Blocking Band | ODavg > 5 275 – 408 nm |
Blocking Band | ODavg > 3.3 408 – 413 nm |
Blocking Band | ODavg > 3.3 440 – 445 nm |
Blocking Band | ODavg > 5 445 – 800 nm |
FWHM Bandwidth | 14nm |
Guaranteed Minimum Bandwidth | 10 |
Angle of Incidence | 0 ± 5° |
Cone Half-angle | 7° |
Clear Aperture | ≥21mm |
Transverse Dimensions, Diameter | 25 mm |
Filter Thickness, Mounted | 5.0 mm |
Filter Thickness Tolerance, Mounted | ±0.1mm |
Filter Thickness, Unmounted | 2.0 mm |
Filter Thickness Tolerance, Unmounted | ±0.1mm |
Surface Quality (Scratch-Dig) | 60-40 |
Filter Effective Index | 2.02 |
Optical Damage Rating | Testing has proven to show no signs of degradation when exposed to at least 6.0 W of power from an unfiltered xenon arc lamp over a 25 mm diameter (corresponding to 1.2 W/cm2) for over 500 hrs. |
Orientation | Arrow on ring is preferred direction of propagation of light |
Spectral Characteristic Curves
Transmittance-Wavelength Spectrum
Optical Density Spectrum

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