Optical system and manufacturing method thereof

摘要

The invention concerns an optical system. The optical system comprises an input for receiving an optical signal, a predetermined output plane, and a diffraction grating for separating the optical signal received at the input into spectral elements thereof. The grating has a diffraction surface, which is formed by a photolithography process. The diffraction surface has a first predetermined profile. The first profile is formed by a plurality of points each conducted by different equations. Consequently, each spectral component is focused on the predetermined output plane.

主权项

1. An optical system, comprising:
an input, for receiving an optical signal; a predetermined output plane having a surface with a geometric shape that is not part of a Rowland circle; and a diffraction grating, the diffraction grating being a freeform type grating and being neither a holographic type grating nor a ruling type grating, the diffraction grating having a freeform diffraction surface with a first profile corresponding to the predetermined output plane, the freeform diffraction surface formed by a photolithography process to have a freeform characteristic, the first profile having inflection points and being a freeform profile, the freeform diffraction surface configured to separate the optical signal received at the input into a plurality of spectral components, which are focused on a plurality of points of the predetermined output plane.