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248.6 nm MaxLine® laser clean-up filter

Part Number: LL01-248-25

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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: LL01-248
248.6 nm MaxLine® laser clean-up filter
MaxLine laser-line filters transmit greater than 90% of the light at a precisely defined laser line, while offering incredibly steep edges to eliminate optical noise from non-lasing (plasma) lines and spontaneous emission.
Part NumberSizePrice1Stock StatusQuantity
LL01-248-12.512.5 mm x 3.5 mm$375In 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
Transmission Band 1Tabs > 40% 248.6 nm
Center Wavelength 1248.6 nm
Guaranteed Minimum Bandwidth 1Transmission guaranteed for laser wavelength only
FWHM Bandwidth 1 (nominal)1.7 nm (typical); 2.2 nm (maximum)
Blocking Band 1ODabs > 5 228.2 – 246.1 nm
Blocking Band 2ODabs > 6 228.7 – 244.9 nm
Blocking Band 3ODabs > 6 252.3 – 273.5 nm
Blocking Band 4ODabs > 5 251.1 – 279.9 nm

General Filter Specifications
Laser Wavelength 1248.6 nm
Angle of Incidence0 ± 2 degrees
Cone Half-angle0.5 degrees
Optical Damage Rating0.1 J/cm2 @ 532 nm (10 ns pulse width)
Filter Effective Index1.77 Understanding ‘Effective Index of Refraction’ neff

Physical Filter Specifications (applies to standard sized parts; contact us regarding other sizes)
Transverse Dimensions (Diameter)12.5 mm
Transverse Dimensions 2 (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≥ 10 mm
Clear Aperture 2≥ 22 mm
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

Edge Filters


248 nm RazorEdge® ultrasteep long-pass edge filter

• Laser Wavelength = 248.6 nm
• 805 cm-1 transition
• Tavg > 90% 261.0 – 560.8 nm

Custom sizing delivery confirmed ARO (sizing fee applies).
Part # LP02-248RS-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
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
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.

248 MaxLine LaserLine Laser clean-up filter cleanup Laser-line LL01-248 LL01 Line LL01-248-12.5

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