Abstract: A beam homogenizer for surface modification comprises: a first lens array configured to split a laser beam, irradiated from a laser beam irradiation unit, into a plurality of beamlets; a second lens array configured to transmit the plurality of beamlets and comprising a plurality of lenslets corresponding to the first lens array; and a focusing lens configured to focus the plurality of beamlets, transmitted through the second lens array, onto a surface of a target. The beam homogenizer further comprises: a plasma generation-preventing unit disposed between the first and second lens arrays and configured to prevent plasma from being generated in the focal zone of the beamlets; or a damage-preventing unit disposed between the focusing lens and the target and configured to prevent the focusing lens from being damaged by energy generated when the plurality of beamlets is irradiated onto the target.

Abstract: A beam homogenizer for surface modification comprises: a first lens array configured to split a laser beam, irradiated from a laser beam irradiation unit, into a plurality of beamlets; a second lens array configured to transmit the plurality of beamlets and comprising a plurality of lenslets corresponding to the first lens array; and a focusing lens configured to focus the plurality of beamlets, transmitted through the second lens array, onto a surface of a target. The beam homogenizer further comprises: a plasma generation-preventing unit disposed between the first and second lens arrays and configured to prevent plasma from being generated in the focal zone of the beamlets; or a damage-preventing unit disposed between the focusing lens and the target and configured to prevent the focusing lens from being damaged by energy generated when the plurality of beamlets is irradiated onto the target.

Abstract: A fracturing device using a shock wave of a plasma reaction includes a partition unit for partitioning a reaction space such that a reaction medium is accommodated therein, by sealing a part having a plurality of through-holes among well casing of a gas well provided at shale rock layer so as to extract shale gas and a probe for applying energy to the reaction medium such that the reaction medium generates shock wave by a plasma reaction as the energy is applied to the reaction medium accommodated inside the reaction space, so as to propagate shock wave to the shale rock layer.

Abstract: Provided is a fracturing device using a shock wave of a plasma reaction, the fracturing device comprising: a partition unit for partitioning a reaction space such that a reaction medium is accommodated therein, by sealing a part having a plurality of through-holes among well casing of a gas well provided at shale rock layer so as to extract shale gas; and a probe for applying energy to the reaction medium such that the reaction medium generates shock wave by a plasma reaction as the energy is applied to the reaction medium accommodated inside the reaction space, so as to propagate shock wave to the shale rock layer.