Combination of a laser processing device and an adapter for mechanically coupling an object to the laser processing device, which provides a receptacle for fastening the adapter, wherein - the adapter comprises a central region which can be moved into the beam path of the laser processing device extending along an optical axis up to the object, wherein the central region is formed as a contact glass to be placed on the object, - the adapter has an edge region lying outside the central region, which edge region does not lie in the beam path when the adapter is used, - the adapter on the one hand can be fastened to the laser processing device and on the other hand is formed with its central region for mounting on the object, - fastening means are provided on the edge region by means of which the adapter can be detachably fastened to the receptacle of the laser processing device so that it can be inserted into the receptacle by means of an insertion movement extending substantially along the optical axis and can be detached from the receptacle, - the fastening means comprise a flange surface for fastening by means of a vacuum or electrostatic or electromagnetic effects, and - the edge region of the adapter and the receptacle are formed so that together they effect a centring fastening of the adapter on the laser processing device, - wherein the edge region of the adapter is formed having a frusto-conical shape and the receptacle has a bore with a matching conical shape so that the frusto-conical edge region of the adapter is drawn by a vacuum or the electrostatic or electromagnetic effects into the tapering bore, - or wherein the edge region of the adapter widens out conically to the laser processing device and the receptacle has a matching frusto-conical shape so that the adapter is fastened by means of a vacuum or the electrostatic or electromagnetic effects in a centring manner on the laser processing device. - the adapter comprises a central region which can be moved into the beam path of the laser processing device extending along an optical axis up to the object, wherein the central region is formed as a contact glass to be placed on the object, - the adapter has an edge region lying outside the central region, which edge region does not lie in the beam path when the adapter is used, - the adapter on the one hand can be fastened to the laser processing device and on the other hand is formed with its central region for mounting on the object, - fastening means are provided on the edge region by means of which the adapter can be detachably fastened to the receptacle of the laser processing device so that it can be inserted into the receptacle by means of an insertion movement extending substantially along the optical axis and can be detached from the receptacle, - the fastening means comprise a flange surface for fastening by means of a vacuum or electrostatic or electromagnetic effects, and - the edge region of the adapter and the receptacle are formed so that together they effect a centring fastening of the adapter on the laser processing device, - wherein the edge region of the adapter is formed having a frusto-conical shape and the receptacle has a bore with a matching conical shape so that the frusto-conical edge region of the adapter is drawn by a vacuum or the electrostatic or electromagnetic effects into the tapering bore, - or wherein the edge region of the adapter widens out conically to the laser processing device and the receptacle has a matching frusto-conical shape so that the adapter is fastened by means of a vacuum or the electrostatic or electromagnetic effects in a centring manner on the laser processing device. - wherein the edge region of the adapter is formed having a frusto-conical shape and the receptacle has a bore with a matching conical shape so that the frusto-conical edge region of the adapter is drawn by a vacuum or the electrostatic or electromagnetic effects into the tapering bore, - or wherein the edge region of the adapter widens out conically to the laser processing device and the receptacle has a matching frusto-conical shape so that the adapter is fastened by means of a vacuum or the electrostatic or electromagnetic effects in a centring manner on the laser processing device.