... of IPL in different wavelength according to IPL Hair Removal Skin Rejuvenation Laser Hair Removal: Material: BK7, Fused Silica, Sapphire, etc. ... min. (General), <10arc sec.(High Precision)Flatness (per 25mm@633nm):<λ/2 (General), <λ/10 (High Precision)Bevel (face width x 45.):<0 ... .25mm (General), No Bevel (High Precision)Chip (mm):<0.2 (General), <0.05 (High Precision)Wavelength(nm): 515-1200, ...