Patent ID: 8456624

Claim:
An inspection device for inspecting a spatial light modulator having a plurality of optical elements arrayed two-dimensionally and controlled individually, said inspection device comprising: a conjugate optical system which is arranged optically downstream from the spatial light modulator and which forms a conjugate plane optically conjugate with an array plane where the plurality of optical elements are arrayed; a first photodetector having a first detection surface arranged on or near the conjugate plane; a Fourier transform optical system which is arranged optically downstream from the spatial light modulator and which forms a Fourier transform plane optically in a Fourier transform relation with the array plane where the plurality of optical elements are arrayed; a second photodetector having a second detection surface arranged on or near the Fourier transform plane; and an inspection unit which receives a first output of the first photodetector and a second output of the second photodetector and which inspects optical characteristics of the plurality of optical elements.