Patent ID: 7859656

Claim:
An apparatus for inspecting a specimen comprising: a first illumination unit having a laser source which emits a laser and a first optical component which illuminates a specimen on which patterns are formed with the laser from a first elevation angle; a second illumination unit having a light source which emits a light having plural wavelengths and a second optical component which illuminates the specimen with the light having plural wavelengths from a second elevation angle greater than the first elevation angle; an objective lens which receives light from the specimen illuminated by the first illumination unit and the specimen illuminated by the second illumination unit; a beam splitter which branches into the light from the specimen illuminated by the first illumination unit and the light from the specimen illuminated by the second illumination unit; a first detection unit which is set to form a first light from the specimen illuminated by the first illumination unit and detects said first light; a second detection unit which is set to form a second light from the specimen illuminated by the second illumination unit and detects said second light; and a signal processing unit which processes signals output from the first detection unit to detect defects in a first area on the specimen, and which processes signals output from the second detection unit to detect defects in a second area on the specimen.