Patent ID: 7511806

Claim:
An apparatus for inspecting a specimen, comprising: a table which mounts a specimen to be inspected; an illumination optical unit having a first illuminator which perpendicularly illuminates a surface of the specimen with a first ultraviolet laser beam and a second illuminator which obliquely illuminates the surface of the specimen with a second ultraviolet laser beam; a detection optical unit having a collection optics for collecting light scattered from the specimen by the illumination of the illumination optical unit and a detector for detecting light passed through the collection optics; and a signal processor which processes a signal outputted from the detector by the detection of light scattered from the specimen and detects defects on the specimen, wherein said first illuminator of said illumination optical unit having a mirror installed beneath the collection optics for perpendicularly illuminating the specimen with the ultraviolet light which incidents on the mirror from a direction parallel to the surface of the specimen, and said detector of said detection optical unit detects light from the specimen caused by the illumination of the ultraviolet light perpendicularly illuminated by the first illuminator and scattered upward the specimen and not shaded by the mirror and light from the specimen caused by the illumination of the ultraviolet light obliquely illuminated by the second illuminator and scattered upward the specimen and not shaded by the mirror, wherein said signal processor classifies said detected defects by using a first signal output from the detector by the detection of the light scattered from the specimen by the illumination of the first illuminator and a second signal output from the detector by the detection of the light scattered from the specimen by the illumination of the second illuminator.