GEM Optoelectronics have in house capabilities for Optical Coating, Metallization, Plating, Etching, Lithography, Wire bonding etc. We volume produce Sapphire widows, Germanium windows, TO Can, TO Headers, DPC components, HTCC ceramic shell and ceramic submount. Our Focus is to provide good quality products to customers.

aluminum nitride substrates
https://www.gem-optics.com/