Reinforced multi-body optical devices. In one example embodiment, a method for fabricating a reinforced multi-body optical device includes various acts. First, a supporting plate is bonded, using pressure and heat, to a multi-body optical device to form a reinforced multi-body optical device. The supporting plate has a coefficient of thermal expansion (CTE) that is within about 0.5 parts per million of the CTE of the multi-body optical device. Then, the multi-body optical device is ground to reduce the thickness of the multi-body optical device.