Polarization diffraction element

TL;DR: The diffraction gratings 3, 4 are formed with rectangular projecting parts 6 within the equal grating intervals D and are so provided as to allow nearly 100% transmission of the P polarization component of the incident light 5 on the polarization diffraction element 1 at an incident angle θ i1 is transmitted to 0 order diffracted light 5a through the diffraction grings 3 and 4 and S polarization component is diffracted as 1st order diffuse light 5b by diffraction gating 3 and is further diffracted by gating 4.

Abstract: PURPOSE: To separate incident light to two parallel luminous fluxes of different polarization components by providing two diffraction gratings which have the grating intervals equal to each other and are so formed as to have the mutual grating directions coincident with each other respectively on the different faces of a flat plate substrate. CONSTITUTION: The diffraction gratings 3, 4 are formed with rectangular projecting parts 6... within the equal grating intervals D and are so provided as to allow nearly 100% transmission of the P polarization component of the incident light 5 and to allow nearly 100% diffraction of the S polarization component. The P polarization component of the incident light 5 on the polarization diffraction element 1 at an incident angle θ i1 is transmitted to 0 order diffracted light 5a through the diffraction gratings 3, 4 and S polarization component is diffracted as 1st order diffracted light 5b by the diffraction grating 3 and is further diffracted by the diffraction grating 4. These light rays are respectively emitted from the element 1. Since the gratings 3, 4 are formed at the grating interval D equal to each other, the 0 order diffracted light 5a and the 1st order diffracted light 5b are emitted in parallel from the element 1. COPYRIGHT: (C)1990,JPO&Japio