Patent ID: 8804111

Claim:
A surface inspection system, comprising: a radiation source that emits a broadband radiation beam, a radiation directing assembly to target the broadband radiation beam onto the surface, a radiation collection assembly to collect radiation reflected from the surface, a multi-chip detector array, comprising, a prism to divide the collected radiation into a first visible radiation band that exits the prism on a first face of the prism, and a second infrared and above radiation band that exits the prism on a second face of the prism that is different from the first face of the prism, a first chip glued to the first face of the prism by an index matched optical epoxy, the first chip to receive only the first radiation band and produce an image of the surface, and a second chip glued to the second face of the prism by an index matched optical epoxy, the second chip to receive only the second radiation band and produce focus data for the radiation collection assembly, where a thermal expansion coefficient of the prism substantially matches a thermal expansion coefficient of both the first chip and the second chip.