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670nm Short-Pass Dichroic Filter
This product is a 670 nm shortpass dichroic beamsplitter specifically designed for optical systems with a 45°angle of incidence. Manufactured using high-performance dielectric multilayer coating technology, it provides high transmission with an average transmittance greater than 90% over the 360-650 nm band, while simultaneously achieving efficient reflection in the near-infrared regions of 680-1080 nm (s-polarization) and 700-1010 nm (p-polarization). The filter features standard fluorescence-grade edge steepness, excellent spectral stability, and outstanding environmental reliability. It is suitable for laser beam splitting, fluorescence microscopy, multispectral imaging, and biomedical detection applications. With a laser-grade optical flatness design, the filter is ideal for optical systems that demand high beam quality, offering a stable and reliable spectral separation solution for research, medical, bioanalytical, and industrial inspection equipment.
Product features:Average transmittance > 90% over 360–650 nm;Optimized for 45° incidence;Standard fluorescence‑grade edge steepness;Suitable for fluorescence microscopy and laser beam-splitting systems;High optical damage resistance, stable performance over long‑term use
Part Number:MP-DF-670
Application area:Fluorescence microscopy | Laser optical systems | Biomedical detection | Research and industrial optics
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Edge Wavelength Transmission Band Reflection Band
670 nm Tavg > 90% 360 – 650 nm 680–1080 nm

Specification | Value |
Transmission Band | Tavg > 90% 360 – 650 nm |
Reflection Band, p-pol | 700 – 1010 |
Reflection Band, s-pol | 680 – 1080 |
Edge Steepness | Standard (for Fluorescence) |
Edge Wavelength | 670nm |
Angle of Incidence | 45 ± 1.5 ° |
Cone Half-angle | 2° |
Flatness / RWE Classification | Laser |
Reflected Wavefront Error | < 6λ P-V RWE @ 632.8 |
Group Delay Dispersion | GDD Details |
Clear Aperture | ≥ 80% (elliptical) |
Transverse Dimensions, LxW | 25.2 mm x 35.6 mm |
Filter Thickness, Unmounted | 1.05mm |
Filter Thickness Tolerance, Unmounted | ± 0.05mm |
Surface Quality (Scratch-Dig) | 60-40 |
Filter Effective Index | 1.68 |
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 | Reflective surface marked with part-Orient in incoming light |
Spectral Characteristic Curves
Transmittance-Wavelength Spectrum
Optical Density Spectrum
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