Patent ID: 9377695
Filing Date: 2016-06-28
CPC Classification: B82Y,G02B,G03F,G21K

Claim Text:
1. A grazing incidence reflector for extreme ultraviolet (EUV) radiation, comprising: a first mirror layer configured to reflect at least partially EUV radiation incident on the reflector with grazing incidence angles in a first range, the first mirror layer being configured to transmit EUV radiation in a second range of incidence angles which overlaps and extends beyond the first range of incidence angles; a multilayer mirror structure beneath the first mirror layer configured to reflect EUV radiation which is incident on the reflector with grazing incidence angles in said second range and which penetrates through the first mirror layer; and a second mirror layer on top of the first mirror layer, the second mirror layer being configured to provide enhanced reflectance for EUV radiation with grazing incidence angles in a third range which is within the first range of angles.