Spectrometer, has focal length of optical system set so that projected light image is at least as large as fiber opening diameter

摘要

The spectrometer includes a light source from which light is coupled into an optical fiber via an acousto-optically tunable filter. The focal length of the optical system is set so that the projected image (B) of the light source on the surface of the optical fiber is at least as large as the entry opening (D) of the optical fiber.