Patent ID: 9146391
Filing Date: 2015-09-29
Classification: G02B,H04N

Abstract:
1. A structured illumination optical system comprising: a first quarter wave plate that is configured to convert a linearly polarized beam to a circularly polarized beam, a second quarter wave plate that is configured to convert the circularly polarized beam exiting from the first quarter wave plate to a linearly polarized beam, a diffraction grating configured to split the linearly polarized beam exiting from the second quarter wave plate into a plurality of beams, the diffraction grating being fixed to the second quarter wave plate, the diffraction grating and the second quarter wave plate being rotatable together relative to the first quarter wave plate, an objective lens configured to form an interference fringe pattern on a sample, the pattern being generated by the plurality of beams, and the objective lens being positioned after the first quarter wave plate, the second quarter wave plate and the diffraction grating, and a control unit configured to control a rotation of the diffraction grating together with the second quarter wave plate relative to the first quarter wave plate.