The laser beam combining device

To provide a laser beam combining device 100 which aimed at the irradiation performance improvement of high energy density and high power density. A laser beam combining device 100 is provided with a plurality of shaping optical unit 11 which reduces the amount of external diameter per unit propagation distance emits a different ring laser beams, wherein each shaping optical unit propagates according, shaping the annular laser beam ratio of the outer diameter dimension is large with respect to the inner diameter with the outer diameter is decreased, the respective shaping optical unit, as ring laser beam emitted is concentric It is located. .FIELD 1