Comparison of two different configurations of multipass amplifier for chirped pulse amplification

We present the results of two different multi-pass designs for the amplification stage of a chirped pulse amplifier system. The first design is a typical one, where all of the beam paths that pass through the amplifying medium are in the same plane. The second one distributes the same number of passes in two planes, reducing the angle between the pump beam and the signal, thus increasing the overlap and the energy extraction efficiency.