Material Specifications | ZnSe, ZnS | Ge, Si, CaF2, MgF2 | Fused Silica, BK7. Zerodur | Sapphire |
Diameter | up to Φ300mm | up to Φ300mm | up to Φ350mm | up to Φ300mm |
PV | PV≤0.1λ @ 632.8nm | PV≤0.1λ @ 632.8nm | PV≤0.1λ @ 632.8nm | PV≤0.15λ @ 632.8nm |
rms | rms≤0.02λ @ 632.8nm | rms≤0.02λ @ 632.8nm | rms≤0.02λ @ 632.8nm | rms≤0.03λ @ 632.8nm |
Roughness | ≤0.2nm | ≤0.2nm | ≤0.1nm | ≤0.2nm |
Roughness of Super-polished Surface Measured by Atom Force Microscope (AFM)
(Fused Silica Substrate with Diameter 200mm, Ra=0.28nm)
Flatness of Super Polished Surface Measure by Zygo Interference Instrument
(Fused Silic Substrate of Diameter 300mm, PV=0.101 Wave @633nm)
Superpolished substrates or mirrors are necessary for some demanding applications like Deep Ultra-violet (DUV) lasers, ultra-high power laser systems and ring laser gyroscopes, low surface scattering loss is required for these applications, the low surface roughness optical components or superpolished optics is necessary to get such low scattering loss. Hangzhou Shalom EO offers the super-polished mirrors or substrates, with extra high flatness, roughness and surface quality, substrate materials include: BK7, UV fused silica, Zerodur, ZnSe, ZnS, Ge, Si, CaF2, MgF2 and sapphire.