Laser beam combining device
AssigneeKawasaki Jukogyo Kabushiki Kaisha
InventorsToru Nagai, Ryuji Nagaoka
Life of this patent
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Abstract
A laser beam combining device includes an emission optical system that emits a plurality of circular laser beams propagated coaxially and having mutually different wavelengths, and a diffractive optical element that is concentric and diffracts the plurality of circular laser beams. The diffractive optical element diffracts the plurality of circular laser beams in accordance with the wavelengths of the circular laser beams, such that local diffraction angles of diffracted light of the plurality of circular laser beams incident at mutually different local incidence angles are equal to each other.
Claims14
A laser beam synthesizing device comprising:
- an emission optical system that emits annular laser beams that are propagated coaxially and have mutually different wavelengths;
- and
- a diffractive optical element that is concentric, diffracts the annular laser beams, and is arranged at a position where outer peripheral edges and inner peripheral edges of the annular laser beams coincide with and overlap each other,
- wherein each of wavefronts of the annular laser beams is continuous in a circular shape;
- and
- wherein the diffractive optical element diffracts the annular laser beams in accordance with the wavelengths of the annular laser beams, such that local diffraction angles of diffracted light of the annular laser beams incident at mutually different local incidence angles are equal to each other, and the diffractive optical element emits the diffracted light having a circular shape.
A method comprising:
- emitting, by an emission optical system, annular laser beams that are propagated coaxially and have mutually different wavelengths;
- and
- diffracting the annular laser beams with a diffractive optical element that is concentric, wherein the diffractive optical element is arranged at a position where outer peripheral edges and inner peripheral edges of the plurality of annular laser beams coincide with and overlap each other,
- wherein each of wavefronts of the annular laser beams is continuous in a circular shape;
- and
- wherein the diffractive optical element diffracts the annular laser beams in accordance with the wavelengths of the annular laser beams, such that local diffraction angles of diffracted light of the annular laser beams incident at mutually different local incidence angles are equal to each other, and the diffractive optical element emits the diffracted light having a circular shape.
A laser beam synthesizing device comprising:
- an emission optical system that emits annular laser beams that are propagated coaxially and have mutually different wavelengths;
- and
- means for diffracting that is concentric, diffracts the annular laser beams, and is arranged at a position where outer peripheral edges and inner peripheral edges of the annular laser beams coincide with and overlap each other,
- wherein each of wavefronts of the annular laser beams is continuous in a circular shape;
- and
- wherein the means for diffracting diffracts the annular laser beams in accordance with the wavelengths of the annular laser beams, such that local diffraction angles of diffracted light of the annular laser beams incident at mutually different local incidence angles are equal to each other, and the means for diffracting emits the diffracted light having a circular shape.
Dependencies are inferred from the claim text.