Covesion is a company that specializes in researching, developing, and manufacturing magnesium-doped periodically poled lithium niobate (MgO:PPLN) crystals and waveguides for non-linear frequency conversion. It offers fiber-coupled bulk crystal modules, ruggedized waveguide package, custom PPLN, MgO:PPLN crystal and chips, temperature controllers, etc. The company caters to the space, defense, spectroscopy, environmental science, and quantum science sectors.