The present invention relates to a component assembly and to a method of fabricating such a component assembly. The component assembly includes a substrate, a mount attached to the substrate, and a component attached to the mount with solder by melting the solder with light from a light source. The mount is composed of a ceramic material having properties advantageous for soldering using a light source. As a first property, the ceramic material is optically absorptive to enable the mount to be heated by the light from the light source. As a second property, the ceramic material has a first thermal conductivity at an operating temperature of the component and a second thermal conductivity at a melting point of the solder, the second thermal conductivity being at least 25% lower than the first thermal conductivity.