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638 nm RazorEdge® ultrasteep long-pass edge filter

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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.

Note on spectral plots:
In the past, each shipment has included a spectral plot for every filter and every lot code in the shipment. In an effort to be more eco-friendly, we will no longer be including these plots with each shipment. If you require spectral plot data, please see here for more information.

Optical Specifications
Transmission BandTavg > 93% 646.3 – 1439.1 nm
Laser Wavelength638 nm
Edge Wavelength642.9 nm
Blocking BandODabs > 6 638 nm
ODavg > 6 510.4 – 638 nm (typical)
Transition Width155 cm-1
6.4 nm
Edge Steepness0.5%
3.2 nm
78 cm-1


General Specifications
Angle of Incidence0 ± 2 °
Cone Half-angle5 °
Filter Effective Index1.84 Understanding 'Effective Index of Refraction' neff
Optical Damage Rating0.5 J/cm² @ 266 nm (10 ns pulse width)
1 J/cm² @ 532 nm (10 ns pulse width)


Physical Specifications (for standard parts - please contact us for custom sizes)
Mounted / UnmountedMounted
ShapeRound
Size25 x 3.5 mm
50 x 3.5 mm
Transverse Tolerance, Mounted+ 0.0 / - 0.1 mm
Filter Thickness, Mounted3.5 mm
Filter Thickness Tolerance, Mounted± 0.1 mm
Clear Aperture≥ 22 mm
≥ 45 mm
Surface Quality (Scratch-Dig)60-40
Substrate Thickness2.0 mm
Substrate TypeFused Silica
OrientationArrow on ring indicates preferred direction of propagation of light


LP02-638RU-25

  • Size: 25 x 3.5 mm
  • Transverse Dimensions, Diameter: 25 mm

LP02-638RU-50

  • Size: 50 x 3.5 mm
  • Transverse Dimensions, Diameter: 50 mm

Transmission

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Optical Density

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Semrock Spectral Plot Info
LP02-638RU_Spectrum
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LP02-638RU

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