Need optical glass for IPL with these specifications:Material: N-BK7 Grade A optical glass, Fused silica, Sapre crystalDimension Tolerance:+ -0.1(General), + -0.01(High Precision)Thickness Tolerance:+ -0.2 (General), + -0.005(High Precision)Surface Quality:60 40 or better 40 20Clear Aperture:>90%Parallelism: