| 摘要 |
An optical device includes a wavelength separation filter configured to separate incident light into light having a first wavelength and light having a second wavelength, the wavelength separation filter including a blazed grating whose cross-sectional shape is a saw-tooth shape formed by one-dimensionally arranging a plurality of grating elements, wherein the blazed grating is configured to exert a first power on the light having the first wavelength, of the light having the first wavelength and the light having the second wavelength, by gradually changing angles surfaces of the plurality of grating elements make with a base plane, and to exert a second power on the light having the second wavelength, of the light having the first wavelength and the light having the second wavelength, by gradually changing lengths of the plurality of grating elements along a direction in which the plurality of grating elements are arranged. |
