Laser amplifier system, comprising a resonator with optical resonator elements (24, 34) determining a course of a resonator radiation field (26, 36) propagating along an optical axis and at least one laser-active medium, wherein the resonator is designed as a split resonator having a first resonator section extending from a first virtual plane of separation and a second resonator section extending from a second virtual plane of separation, wherein the resonator sections (20, 30) are dimensioned optically such that the resonator radiation field (26, 36) has radiation field states corresponding to the same resonator modes in each of the virtual planes of separation (22, 32), wherein an amplifying unit optically independent of the resonator is arranged between the first and the second virtual planes of separation (22, 32), said amplifying unit comprising the at least one laser-active medium and coupling the radiation field states corresponding to the same resonator modes in a neutral manner with respect to the resonator modes such that the amplifying unit is optically independent of the resonator and, thus, the dimensioning of the resonator and the determination of the resonator modes are independent of the optical characteristics of the amplifying unit, wherein the amplifying unit comprises at least one amplifier module having the at least one laser-active medium, wherein the at least one amplifier module behaves in an optically neutral manner with respect to the resonator modes, wherein, in this respect, each amplifier module extends between a first virtual module end plane and a second virtual module end plane and is dimensioned optically such that during operation of the laser amplifier system with at least an average power within a predetermined power range it transforms an intensity profile representing radiation field states of an amplifier module radiation field in one of the module end planes to the other one of the module end planes in at least one central area in a manner retaining the intensity profile shape and wherein a first one of the virtual module end planes is coupled to the first virtual plane of separation and a second one of the virtual module end planes is coupled to the second virtual plane of separation, wherein, in this respect, at least in the central area the intensity values of the intensity profile normalized to its maximum value, said intensity values representing individual radiation field state values, deviate from one another by a maximum of 20 % of the maximum value in the locations in the module end planes (52, 54) respectively associated with one another as a result of imaging, wherein, in this respect, the association of the individual locations as a result of imaging is to be understood in that in the case of an exact imaging the individual locations are clearly associated with one another, in the case of an out-of-focus imaging the association is brought about in that in the case of the out-of-focus image of a location of one module plane in the other module plane the geometric centre of the out-of-focus image of this location is to be considered as associated location, wherein the at least one amplifier module transforms a phase profile representing radiation field states from one module end plane (52, 54) to the other module end plane (54, 52) at least in a central area in a manner retaining the phase profile shape and wherein, in this respect, the difference in the phase values of the phase profiles in the locations in the module end planes (52, 54) respectively associated with one another as a result of imaging is less than 4 rad at every point.