be made to the statements regarding same in a ninth exemplary embodiment of a laser amplifier system according to the invention illustrated in fig2 and fig2 the partially collimated region 40 of the radiation field 20 is focused on an intermediate focus area 184 by a focusing lens 180 having a longer focal length than the collimating lens 30 and situated within this intermediate focus area 184 is a resonant waveguide grating 50 u2032 u2033 whose grating structure 56 u2033 u2032 has structural elements 54 u2032 u2033 oriented transversely with respect to the second direction 16 similarly as for the eighth exemplary embodiment for example the resonant waveguide grating 50 u2032 u2033 extends with its the extent wg 1 in the first direction approximately over the same distance as in the eight exemplary embodiment i e over more than 20 for example but with its extent wg 2 extends in the second direction 16 over at most 30 of a radiation cross section sq u2032 in the focus area 184 in this exemplary embodiment due to the focused incidence of the laser radiation field 20 on the resonant waveguide grating 50 u2033 u2032 only the portion of the incident laser radiation field 20 situated within the region of the angular acceptance of u00b1 2 u00b0 explained in conjunction with the.