Patent ID: 8237132

Claim:
An apparatus, comprising: a material source configured to provide a quantity of a material; a radiation source configured to emit a radiation beam along an axis that strikes the quantity of material, causing substantially all of the quantity of material to evaporate; and a structure having first and second surface portions and configured to rotate the first and second surface portions about the axis, the structure having first and second operational modes, wherein in the first operational mode the structure rotates the first and second surface portions about the axis such that the first surface portion is positioned on a first side of the radiation beam and receives a greater quantity of a byproduct of the evaporation impinges than the second surface portion positioned on a second side of the radiation beam, and in the second operational mode the structure rotates the first and second surface portions about the axis such that the second surface portion is positioned on the first side of the radiation beam and receives a greater quantity of the byproduct impinges than the first surface portion positioned on the second side of the radiation beam.