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Femtoline Low GDD Ultrafast Mirrors

Laser mirrors for femtosecond applications are designed to have a broad operating wavelength range and linear phase versus frequency characteristics (low group delay dispersion (GDD)). The coating is a single layer dielectric and has no phase shift over the operating wavelength region.

High reflectivity mirrors always have higher reflection, broader operating region and lower pulse distortion for s-polarization than for p-polarization for the same dielectric coating. If possible use the mirrors with s-polarized beam.

Our standard mirrors are suitable for fundamental Ti:Sapphire and Yb:KGW/KYW lasers and their doubled, tripled or quadrupled frequencies. Recommended for high power laser applications operating in UV region.

Substrate
Material
UV grade Fused Silica or BK7 glass
S1 Surface Flatness
λ/10 at 633 nm
S1 Surface Quality
20-10 scratch & dig (MIL-PRF-13830B)
S2 Surface Quality
Commercial polish
Diameter Tolerance
+0.00 mm-0.12 mm
Thickness Tolerance
±0.25
Wedge
<3 min
Chamfer
0.3 mm at 45° typical

 

Coating
Technology
Electron beam multilayer dielectric or Ion Beam Sputtering
Adhesion and Durability
Per MIL-C-675A. Insoluble in lab solvents
Clear Aperture
Exceeds central 85% of diameter
Coating
Hard dielectric High Reflection R>99.5%
Designed for Average Polarization
R=(Rs+Rp)/2
Laser Damage Threshold >100 mJ/cm2, 50 fsec, 50 Hz, 800 nm typical
Coated Surface Flatness λ/10 at 633 nm over clear aperture
Angle of Incidence 0 or 45±3 degrees

http://eksmaoptics.com/femtoline-components/femtoline-mirrors/femtoline-low-gdd-mirrors/