Optical windows size 9.50mm to 23.00mm thickness 1.00mm/1.25mm. A/R coating 850nm/1310nm/1550nm. A/R coating must be same hardness as sapphire substrate. Equivalent to BK7 may also be acceptable. Please also state your flatness, dig and scratch tolerances. Windows must be packed clean and any contamination must go with air jet. Typical order quantity: 1K; 2.5K Show More