https://www.3doptix.com/catalog/optics/window/optosigma/OPCF-30C02-P
Optics | Window | OptoSigma | OPCF-30C02-P 30 mm Dia. CaF2 Round Flat Window; t=2 mm Uncoated |...
"Discover the OPCF-30C02-P 30mm CaF2 Round Flat Window from OptoSigma, featuring a 2mm thickness and uncoated surface. Ideal for ultraviolet and infrared laser...