Superpolished Substrates and Mirrors

Variety substrate materials: BK7, UV fused silica, Zerodur, ZnSe, ZnS, Ge, Si, CaF2, MgF2 and Sapphire.
Unique polishing processing
Surface Roughness down to 1Å
High Reflection (HR) coating and Anti-reflection (AR) available
Applications: DUV lasers, high power lasers, gyroscope

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Specifications:

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.