Patent ID: 8746903

Claim:
A method for assembling a mirror plate stack comprising a plurality of mirror plates and a base plate onto which the plurality of mirror plates are stacked, the method comprising: providing a base plate with a first mirror plate mounted thereto; providing a handling tool with a second mirror plate; providing a spacer to a first surface of the second mirror plate; positioning the handling tool comprising the second mirror plate with the spacer to align the second mirror plate with the first mirror plate, wherein the second mirror plate is aligned relative to the first mirror plate based on a measured position and shape of the first mirror plate to compensate a deviation of the measured position and shape of the first mirror plate from a pre-defined position and shape of the first mirror plate; attaching the second mirror plate to the first mirror plate by bonding the spacer to the first mirror plate, wherein the spacer determines a pre-defined distance between the first and the second mirror plates; exposing a second surface of the second mirror plate by removing the handling tool from the attached second mirror plate; and measuring the position and shape of the attached second mirror plate after the second surface has been exposed.