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229/244 nm StopLine® dual-notch filter

Part Number: NF01-229/244-25

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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: NF01-229/244  NF01  229/244
229/244 nm StopLine® dual-notch filter
Dual-notch filters are ideal for laser-based fluorescence instruments, confocal and multi-photon fluorescence microscopes, and analytical and medical laser systems. These filters offer high transmission over wide passbands. They offer deep laser-line blocking for maximum laser rejection, and rejected light is reflected for best alignment and stray light control.
Part NumberSizePrice1Stock StatusQuantity
NF01-229/244-2525 mm x 3.5 mm$1,045In StockAdd To Cart


This part is not available for custom sizing.


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
SpecificationValue
Transmission Band 1No short-wavelength transmission
Transmission Band 2Tavg > 25% 233.3 – 239.3 nm
Transmission Band 3Tavg > 60% 248.9 – 278.0 nm
Blocking Band 1ODabs > 4 229 nm
Blocking Band 2ODabs > 4 244 nm

General Filter Specifications
SpecificationValue
Laser Wavelength 1229 nm
Laser Wavelength 2244 nm
Angle of Incidence0 ± 5 degrees
Cone Half-angle5 degrees
Optical Damage Rating1 J/cm2 @ 532 nm (10 ns pulse width)
Filter Effective Index2.25 Understanding ‘Effective Index of Refraction’ neff

Physical Filter Specifications (applies to standard sized parts; contact us regarding other sizes)
SpecificationValue
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
Scratch-Dig60-40
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

Tech Note
TopicDescription
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
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

229/244 StopLine Dual Notch NF01-229/244 Dual-Notch NF01 Dual NF01-229/244-25

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