Patent ID: 7775684

Claim:
A wavelength selective element comprising: a base member; light selective regions formed in the base member, in which a predetermined selective wavelength is selected from laser light emitted from a plurality of light emission elements that emit the laser light; and interference regions, each of which is provided in one of the light selective regions, each of which includes interference fringes, and including at least a first interference region and a second interference region in which a first distance between the interference fringes of the first interference region is different from a second distance between the interference fringes of the second interference region, and the interference regions including a region in which two adjacent interference regions overlap in a boundary portion of the interference regions in a longitudinal direction of the wavelength selective element, wherein the light emission elements are aligned with the interference regions in the longitudinal direction so that the laser light emitted from the light emission elements is incident onto the interference regions, respectively.