Rectangular Sapphire Windows

Manufactured in the USAManufactured in the USA


Rectangular sapphire windows and square sapphire windows are manufactured regularly at Guild Optics. Sapphire windows are excellent at protecting delicate optics due to their superior strength and transmission. Rectangular sapphire windows can also be used as viewports in high pressure or vacuum situations. Square sapphire pressure windows can be made much thinner than other optical glasses due to sapphire’s high modulus of rupture.
With a MOHS hardness of 9, sapphire is second only to diamond and it transmits from 190nm to 5000nm making it a great choice for UV applications and mid wave infrared. 
Guild Optical is a top tier supplier for many of the best companies in the United States. When precision sapphire optics are required, Guild delivers per the drawing, on time, and on budget. 

Round sapphire optical components are typically the more economical route but Rectangular windows are often needed to fit certain sitionation. Guild Optical Associates has the machines needed to create any custom shaped windows as well. 


Length/Width:From 1 mm (.039”) to 305 mm (14”) in any optical axis
Thickness:Varies by size but can be sub millimeter and up
Flatness:Varies by thickness but can be 1/10 wave or better if needed
Parallelism:Varies by size but can be as tight as 1 arc second
Surface Quality:Down to 10/5 Scratch/Dig
Quantities:From singles to full large scale production runs

Blog Posts


Durable, scratch resistant, stronger than glass

learn the benefits of sapphire optics