Device for fastening an optical element including a mirror

The invention relates to a device for fastening an optical element, in particular a mirror (1) on any structure, characterized in that it comprises, to maintain the optical performance of the mirror (1) taking into account thermal and mechanical stresses of the mirror's environment (1), a mechanical support (2) holding the mirror (1) is preformed on the side opposite to its reflecting face to define a bonding area of ​​solid volume (Vs) determined, between the support (2) and the mirror (1), the space thus formed is filled by a glue joint which the volume expansion coefficient (3 alpha3) is determined so that the differential thermal volume change between the solid volume (Vs) and the adhesive volume is practically zero Application:.. fixation of optical elements