This invention allows to separate certain laser pulse trains in a timely manner, but not in the space domain, to obtain so-called laser-sub-pulses. Therefore the optical amplification compartment needs only a single compressor unit which leads to a very efficient cost-benefit ratio in all aspects of this technology field. The time distribution of those laser-sub-pulses enables the system to be satisfied with a single passively driven laser combiner unit and laser pulse train combiner path. Therefore, there is no need for an active stabilization of the laser cavity length. For that purpose a special combiner scheme is used. The core of this invention can be described by a symmetrical optical path for the pulse divider and pulse combiner section, which acts accordingly depending on the flow direction of the laser-sub-pulses. In short, this invention allows laser pulse amplification at a low cost and small footprint for the first time.