One of the main applications of the products is for MEMS's beam delivery and coupling, such as MEMS VOA for Optics Communications application. Based on Photop's unique manufacturing process, these Lens/Windows Caps feature high transmittance, low aberration, and hermetic seal.

They are also widely used in Laser Diode Coupling, Laser Diode Pigtailing, Photo Diode Coupling and Single Element Coupling System.