Patent ID: 9599905
Date: 2017-03-21
CPC Classifications: G02B,G03F

Claim:
1. An illumination optical system which illuminates an illumination objective surface with a light from a light source, the illumination optical system comprising: a spatial light modulator which includes a plurality of optical elements arranged within a predetermined plane crossing an optical path of the light from the light source; a relay optical system which is arranged on a light source side of the spatial light modulator and/or on an illumination objective surface side of the spatial light modulator, and which forms a conjugate plane optically conjugate with the predetermined plane; a first polarization member which is arranged within the conjugate plane or in a vicinity of the conjugate plane and into which comes a first light of the light from the light source, the first light having a first polarization state, and which emits the first light having a second polarization state after changing a polarization state of the first light from the first polarization state to the second polarization state different than the first polarization state; and a second polarization member which includes an incident surface into which comes the first light having the second polarization state transmitted via the first polarization member and a second light of the light from the light source, the second light having the first polarization state and having bypassed the first polarization member, and which emits the first light having a third polarization state after changing the polarization state of the first light from the second polarization state to the third polarization state different than the second polarization state and emits the second light having a fourth polarization state after changing the polarization state of the second light from the first polarization state to the fourth polarization state different than the first polarization state.