Material
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UV grade Fused Silica or BK7 glass
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S1 Surface Flatness
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λ/10 at 633 nm
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S1 Surface Quality
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20-10 scratch & dig (MIL-PRF-13830B)
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S2 Surface Quality
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Commercial polish
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Diameter Tolerance
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+0.00 mm-0.12 mm
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Thickness Tolerance
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±0.25
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Wedge
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<3 min
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Chamfer
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0.3 mm at 45° typical
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Technology
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Electron beam multilayer dielectric or Ion Beam Sputtering
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Adhesion and Durability
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Per MIL-C-675A. Insoluble in lab solvents
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Clear Aperture
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Exceeds central 85% of diameter
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Coating
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Hard dielectric High Reflection R>99.5%
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Designed for Average Polarization
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R=(Rs+Rp)/2
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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 |
EKSMA Optics Femtoline Low GDD Ultrafast Mirrors
141.07 kB |
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.