Patent ID: 8824522

Claim:
A pump light assembly for a disc laser, comprising: a focusing device, in particular a concave mirror, having a reflecting surface for focusing a pump light beam onto a laser-active medium, and a deflecting assembly for deflecting the pump light beam between reflecting regions (B 1 to B 12 ) formed on the reflecting surface and disposed in different angular regions about a central axis of the reflecting surface, wherein the deflecting device is configured to produce a deflection of the pump light beam between in each case two of the reflecting regions (B 1 to B 12 ) with an optical path length (2f+2 d1; 2f+2 d2) that is greater than the optical path length (2f) in the case of telecentric imaging in order to compensate for a beam expansion of the pump light beam, caused by aberrations of the focusing device, in successive focusings onto the laser-active medium and wherein the additional optical path length (2 d1; 2 d2) in excess of the optical path length (2 f) in the case of telecentric imaging is at least a quarter of the focal length (f) of the focusing device.