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785 nm RazorEdge Dichroic™ laser-flat beamsplitter

Part Number: LPD01-785RU-25

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  • Your filter spectrum may differ slightly from the typical spectrum above, but is certified to meet the optical specifications noted below.
Optical Specifications
Reflection Band 1Rabs > 94% 785 nm
Reflection Band 1 (p-pol)Rabs > 90% 785 nm
Reflection Band 1 (s-pol)Rabs > 98% 785 nm
Edge Wavelength 1792.9 nm
Transmission Band 1Tavg > 93% 795.2 – 1213.8 nm

General Filter Specifications
Angle of Incidence45 degrees with a shift of 0.35%/degree (40 – 50 degrees)
Cone Half-angle0.5 degrees
Optical Damage Rating1 J/cm2 @ 532 nm (10 ns pulse width)
SteepnessUltra Steep
Laser Wavelength 1785 nm
Edge Steepness (%)0.5%
Edge Steepness (nm)3.9 nm
Edge Steepness (cm-1)63.4 cm-1
Transition Width (nm)7.9 nm
Transition Width (cm-1)126 cm-1
Filter Effective Index1.72 Understanding ‘Effective Index of Refraction’ neff
Flatness / RWE ClassificationLaser
Reflected Wavefront Error< 6λ P-V RWE @ 632.8 nm

Physical Filter Specifications (applies to standard sized parts; contact us regarding other sizes)
Transverse Dimensions (Diameter)25 mm
Transverse Tolerance± 0.1 mm
Clear Aperture≥ 80%
Substrate TypeFused Silica
Substrate Thickness (unmounted)2.0 mm
Substrate Thickness Tolerance (unmounted)± 0.1 mm
OrientationArrow on ring indicates preferred direction of propagation of light.

Revised Filter


785 nm RazorEdge Dichroic™ laser beamsplitter

• Laser Wavelength = 785 nm
• 126 cm-1 transition
• Tavg > 93% 795.2 – 1213.8 nm
• Flatness / RWE: Laser

Custom sizing delivery confirmed ARO (sizing fee applies).
Part # LPD02-785RU-25
(Non-US pricing info)

US domestic pricing only. If you are ordering from outside the US, please contact your nearest regional distributor for the correct list price.
Tech Note
Cleaning Optical FiltersInstructions for cleaning hard coated optical filters
Filter ReliabilityCompares the performance and reliability of hard coated filters to traditional soft-coated filters and provides information about the testing standards for Semrock filters
Flatness of Dichroic BeamsplittersDescribes the impact of non-flat dichroic beamsplitters on microscope image fidelity
Measuring Light with Wavelengths & WavenumbersCompares units of wavelength to wavenumbers and provides formulas for calculating wavenumber shift
Laser Damage ThresholdProvides information for calculating laser damage threshold for pulsed and continuous wave lasers
Filter Types for Raman Spectroscopy ApplicationsCompares the performance of different combinations of LWP and SWP edge filters, notch and laser line filters for Raman applications
RazorEdge Filter LayoutsDescribes two different filter layouts that are commonly used in Raman applications
Journal Article
Thin-Film Filters for Raman SpectroscopyTuran Erdogan, PhD, and Victor Mizrahi, PhD, Semrock Inc., Spectroscopy, December 2004
Describes the types and functions of filters commonly used in Raman spectroscopy
White Paper
Flatness of Dichroic Beamsplitters Affects Focus and Image QualityAnalysis of how the radius of curvature of a dichroic filter affects focal plane shift, spot size and image fidelity in fluorescence microscopy.
Raman SpectroscopyAn overview of Raman spectroscopy, including solutions from Semrock and additional learning resources.


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