Patent ID: 7440546

Claim:
A method of making a Multilayer Laue Lens (MLL) zone plate for focusing hard x-rays comprising the steps of: providing a substrate; said substrate being a flat polished substrate; sequentially depositing on said substrate a plurality of alternating layers respectively formed of tungsten silicide (WSi 2 ) and silicon (Si) and precisely controlling a thickness of each layer from a minimum thickness of a first deposited layer adjacent the substrate to a maximum thickness of a last deposited layer to form a zone plate multilayer structure; said first minimum thickness layer having a selected thickness of less than or equal to 5 nm with monotonically increasing thickness of said alternating layers to provide said multilayer structure having a thickness of greater than 12 μm (microns); and x-rays passing through said silicon layers and being diffracted by said tungsten silicide layers; and bonding together a pair of said zone plate multilayer structures using a gold-tin mixture as a bonding agent with said maximum thickness layer near the bond layer to produce a bonded multilayer.