*Material:Bk7,fused silica,CaF2,MgF2,BaF2,ZnSe infrared optical crystals.
*Focal�length:+/-1%
*Length�tolerance:+0.0 - -0.1mm
*Width�tolerance:+0.0 - -0.1mm
*Center�thickness�tolerance:+/-0.1mm
*Surface�Figure:lambda/2 at 633nm on plano side
*Surface�quality:60-40�stratch/dig
*Clear�Apenture>90%
*Chamfer:0.25mm at 45 degree typical
*Coating:optional.
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