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Femtoline Laser Harmonic Separators

Offered on Ø 0.5 or 1 inch UVFS substrates with surface flatness λ/10
Harmonic separators are dichroic beamsplitters that reflect one wavelength and transmit the other. Reflectance is better than 99,5% for the wavelength of interest and transmittance is at least 90% for the rejected wavelengths. The rear surface of harmonic separators is antireflection coated. If possible use shorter wavelength for reflection and longer wavelengths for transmission in order to have higher reflection/transmission coeficients.


UV grade Fused Silica
S1 Surface Flatness
λ/10 typical at 633 nm
S1 Surface Quality
20-10 scratch & dig (MIL-PRF-13830B)
S2 Surface Flatness
λ/10 typical at 633 nm
S2 Surface Quality 20-10 scratch & dig (MIL-PRF-13830B)
Diameter Tolerance
+0.00 mm-0.12 mm
Thickness Tolerance
<30 arcsec
0.3 mm at 45° typical


Electron beam multilayer dielectric
Adhesion and Durability
Per MIL-C-675A. Insoluble in lab solvents
Clear Aperture
Exceeds central 85% of diameter
Coated Surface Flatness
λ/10 at 633 nm over clear aperture
Back Side Antireflection Coated AOI 45°, R<0.5%
AOI 0°, R<0.25%
Laser Damage Threshold >100 mJ/cm2, 50 fsec pulse, 800 nm typical