Laser 2000

355 nm RazorEdge™ Dichroic laser beamsplitter

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Each beamsplitter reflects a standard laser line incident at 45° while efficiently passing the longer Raman-shifted wavelengths. The filters exhibit ultrasteep transitions from reflection to transmission, with a guaranteed transition width of < 1% of the laser wavelength for the U-grade version. This laser dichroic beamsplitter is optimized for reflecting laser beams up to 2.5 mm in diameter while minimizing RWE.

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 > 90% 359.6 – 550.3 nm
Reflection BandRabs > 94% 355 nm
Reflection Band, p-polRabs > 90% 355 nm
Reflection Band, s-polRabs > 98% 355 nm
Laser Wavelength355 nm
Edge Wavelength358.6 nm
Transition Width279 cm-1
3.6 nm
Edge Steepness0.5%
1.8 nm
140.1 cm-1

General Specifications
Angle of Incidence45 ° with a shift of 0.35%/° (40 – 50 °)
Cone Half-angle0.5 °
SteepnessUltra Steep
Filter Effective Index1.84 Understanding 'Effective Index of Refraction' neff
Optical Damage Rating1 J/cm² @ 532 nm (10 ns pulse width)
Flatness / RWE ClassificationLaser
Reflected Wavefront Error< 6λ P-V RWE @ 632.8

Physical Specifications (for standard parts - please contact us for custom sizes)
Size25 x 3.5 mm
25.2 x 35.6 x 2.0 mm
25.2 x 35.6 x 1.1 mm
Transverse Dimensions, Diameter25 mm
Transverse Tolerance, Mounted± 0.1 mm
Clear Aperture≥ 80%
Surface Quality (Scratch-Dig)60-40
Substrate Thickness2.0 mm
Substrate TypeFused Silica
OrientationArrow on ring indicates preferred direction of propagation of light.


  • Mounted
  • Shape: round
  • Size: 25 x 3.5 mm


  • Unmounted
  • Shape: rectangular
  • Size: 25.2 x 35.6 x 1.1 mm


  • Unmounted
  • Shape: rectangular
  • Size: 25.2 x 35.6 x 2.0 mm


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Optical Density

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Semrock Spectral Plot Info

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