Patent ID: 8976347
Filing Date: 2015-03-10
Classification: G01N

Abstract:
1. An inspection apparatus that detects a defect of a substrate, comprising: an illumination optical system that irradiates the substrate with an illumination light; a first detection optical system that detects a light from the substrate; a first optical amplification optical system that optically amplifies the light which is detected by the first detection optical system, the light being optically amplified by a stimulated emission by an optical fiber; a first excitation optical system that includes the optical fiber that generates a first excitation light for the optical amplification; a first photoelectron conversion system that photoelectronically converts the light which is amplified by the optical amplification optical system into an electric signal; and a processing unit that detects the defect by using the electric signal from the first photoelectron conversion system, wherein: a wavelength of the excitation light is shorter than a wavelength of the illumination light and a numerical aperture NA of the first detection optical system, a numerical aperture NA′ of the optical fiber, a diameter R of a spot of the illumination light, and a core diameter R′ of the optical fiber satisfy the following relation: