Patent ID: 7875829

Claim:
A light source comprising: a source of substantially monochromatic light having a wavelength between 190 nm and 950 nm, wherein the source provides the light with a power greater than 0.5 kW; an optical train disposed to receive light from the source, the optical train including a collimator disposed to collimate light from the source in a direction perpendicular to a plane and a focusing element disposed to focus the collimated light into a line of radiation on the plane, the line of radiation having a full-width-at-half-maximum (“FWHM”) width between 3 μm and 500 μm and having a FWHM length longer than its width; wherein the focusing element comprises a series of lenses; wherein the series of lenses comprises a first lens, a final lens, and at least one intermediate lens disposed between the first lens and the final lens; and wherein the first lens reduces fast-axis divergence of light passing through the optical train to less than 0.1°.