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224 nm RazorEdge® ultrasteep long-pass edge filter

Part Number: LP02-224R-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.
Semrock Optical Filter: LP02-224R
224 nm RazorEdge® ultrasteep long-pass edge filter
RazorEdge filters allow you to see the weakest signals closer to the laser line, especially for Raman spectroscopy applications. With their deep laser-line blocking, ultrawide and low-ripple passbands, hard-coated reliability, and high laser damage threshold, they offer lasting performance and value.
Part NumberSizePrice1Stock StatusQuantity
LP02-224R-2525 mm x 3.5 mm$1,145In StockAdd To Cart

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Dimension 2: mm 
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Custom Sizing Limits:
Diameter Range: 5mm - 50.8mm
Rectangular Dimensions: 5mm - 50.8mm

Substrate thickness/tolerance as listed on Specifications tab.
Dimensional tolerances are ±0.1mm for unhoused parts.

For sizes outside the limits listed above, please contact customer service at 1-866-SEMROCK

1) US domestic pricing only. If you are ordering from outside the US, please contact your nearest regional distributor for the correct list price.
Optical Specifications
Transmission Band 1Tavg > 90% 235 – 505.9 nm
Edge Wavelength 1235.6 nm
Blocking Band 1ODabs > 6 224.3 nm
Blocking Band 2ODavg > 6 202 – 224.3 nm (typical)
Transition Width (nm)10.1 nm
Transition Width (cm-1)1920 cm-1
Edge Steepness (%)3.3%
Edge Steepness (nm)7.4 nm
Edge Steepness (cm-1)1424.2 cm-1

General Filter Specifications
Laser Wavelength 1224.3 nm
Angle of Incidence0 ± 2 degrees
Cone Half-angle5 degrees
Optical Damage Rating0.5 J/cm2 @ 266 nm (10 ns pulse width), 1 J/cm2 @ 532 nm (10 ns pulse width)
Filter Effective Index3.2 Understanding ‘Effective Index of Refraction’ neff

Physical Filter Specifications (applies to standard sized parts; contact us regarding other sizes)
Transverse Dimensions (Diameter)25 mm
Transverse Tolerance (mounted)+ 0.0 / – 0.1 mm
Filter Thickness (Mounted)3.5 mm
Filter Thickness Tolerance (Mounted)± 0.1 mm
Clear Aperture≥ 22 mm
Substrate TypeFused Silica
Substrate Thickness (unmounted)2.0 mm
Substrate Thickness Tolerance (unmounted)± 0.1 mm
OrientationArrows on ring indicates preferred direction of propagation of light

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
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
Working with Optical DensityTables to describe the relationship between OD and transmission with tips for quickly calculating OD
Filter Spectra at Non-normal Angles of IncidenceDiscusses how angle tuning affects the spectral response of different types of filters.
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
Transition Width & Edge SteepnessDescribes how measurements for edge steepness and transition width differ
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
Raman SpectroscopyAn overview of Raman spectroscopy, including solutions from Semrock and additional learning resources.

224 RazorEdge Ultrasteep Long pass Long-pass Longpass LWP Long-Wave-Pass LP02-224R LP02 LP02-224R-25

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