Patent ID: 7495756
Filing Date: 2009-02-24
Classification: G01N,G02F

Abstract:
1. A pattern inspection apparatus, comprising: a first laser light source configured to emit first laser light having a first wavelength; a second laser light source configured to emit second laser light having a second wavelength different from the first wavelength; a wavelength conversion unit configured to convert the first laser light to a fourth harmonic wave of the first laser light, to generate first summed frequency light from the fourth harmonic wave of the first laser light and from the second laser light, and to generate second summed frequency light from the first summed frequency light and the second laser light as deep ultraviolet light with a wavelength of less than or equal to 266 nm; a first optical fiber configured to connect said first laser light source and said wavelength conversion unit; a second optical fiber configured to connect said second laser light source and said wavelength conversion unit; and a pattern inspection unit with said wavelength conversion unit built therein, the pattern inspection unit configured to inspect a pattern of a workpiece being tested while using as illumination light the deep ultraviolet light as emitted from said wavelength conversion unit.