... :Bk7,K9.Si,Ge,Caf2,sapphire,Znse,GaAs,Zns Optical Windows We are fully committed to designing and making all kinds ... of optical components for customer special use MaterialBK7 etc optical glass to IR CaF2 ... minutesClear aperture> 90%Edges Ground, Maximum 0.25mm Edge ChipCoatingUncoated, AR, HR, PR coating, etc. Appearance Restangular,square,circle,wedge,oval ...