Photonic Sourcing

Laser mirrors for femtosecond applications are designed to have a broad operating wavelength range and linear phase versus frequency characteristics (low reflectance 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 or KYW lasers and their doubled, tripled or quadrupled frequencies.

Substrate
Material UV grade fused silica or BK7 glass
S1 Surface Flatness λ/10 at 633 nm
S1 Surface Quality 20–10 scratch & dig laser quality
S2 Surface Quality Commercial polish
Diameter Tolerance +0.00 mm -0.12 mm
Thickness Tolerance ±0.25 mm
Wedge < 3 min
Chamfer 0.3 mm at 45° typical

Coating
Technology Electron beam multilayer dielectric
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%
Angle of Incidence 45±3°
Designed for average polarization R=(Rs+Rp)/2
Laser Damage Threshold >100 mJ/cm2, 50 fsec pulse, 800 nm typical
Coated Surface Flatness λ/10 at 633 nm over clear aperture