Abstract: This disclosure provides systems, methods and apparatus for packaging of dissimilar devices using electromagnetic radiation from a laser. In one aspect, an apparatus can include a first substrate, a second substrate, and a first device and a second device disposed on the second substrate. A first metal ring on the first substrate contacts a second metal ring on a second substrate, and is heated by a first electromagnetic radiation from a laser to enclose a first cavity containing the first device. A third metal ring on the first substrate contacts a fourth metal ring on the second substrate, and is heated by a second electromagnetic radiation to enclose a second cavity containing the second device. Enclosing the first cavity may be performed under a first atmosphere, and the enclosing the second cavity may be performed under a second, different atmosphere.