681 ULTRA Longpass Dichroic Beamsplitter



681 ULTRA Longpass Dichroic Beamsplitter


ULTRA Series longpass dichroic filter with a 681 nm (± 4.0 nm) cut-on wavelength, greater than 95% average transmittance from 687 nm to 1000 nm, greater than 98% average reflectance from 350 nm to 675 nm, and an exceptionally steep cut-on edge transition. This dichroic filter is designed for use at a 45 degree angle of incidence (AOI). It is coated on a 1.04 mm fused silica substrate and is 25.2 mm x 35.6 mm (± 0.1 mm) in size. Alluxa ULTRA Series longpass dichroic beamsplitters are designed for use with our fluorescence excitation and emission filters to optimize fluorescence instrument performance, resulting in bright, high contrast images of target molecules. All Alluxa optical filters are highly durable and hard-coated using our innovative SIRRUS™ plasma deposition process. Contact us for custom sizing.


Item Number 7137
Angle of Incidence 45 Degrees
Cut-On Wavelength 681 nm ± 4.0 nm
Transmission Band(s) 687 to 1000 nm > 95% T Average
Reflection Band(s) 350 to 675 nm > 98% R Average
Parallelism < 3.0 Arcseconds
Transmitted Wavefront Error < 0.25 Wave RMS @ 632.8nm
Substrate Type Fused Silica
Dimensions 25.2x35.6 mm
Filter Thickness 1.05 mm
Assembly Type Unmounted

Availability: In stock

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