An elongated, mobile apparatus for filling and depositing marine mattresses for use in erosion control. The solid-state laser comprises a solid-state laser medium arranged in a laser cavity which consists oftwo resonator cavitymirrors, a first of saidcavity mirrors being designed as an outcoupling mirror of saidsolid-state 5 laser and a second of saidcavity mirrors being formed to allow optical pumping of saidsolid-state laser medium through saidsecond cavity mirror. One critical interconnect between the output of a pre-driver and the gate of the final output stage causes 1 or 2 dB of loss due to the layout.