Two-dimensional laser system employing two dispersive elements
First Claim
1. A multi-wavelength laser device comprising:
- a plurality of laser emitters (14), wherein each laser emitter (14) produces optical radiation having a different wavelength;
a laser emitter array (10) comprising the plurality of laser emitters (14) wherein the plurality of laser emitters (14) are arranged in a two-dimensional pattern;
a multi-wavelength beam (27) comprising a plurality of multi-wavelength row beams (29), each of the multi-wavelength row beams (29) emanating from the plurality of laser emitters (14) within a laser emitter row (12);
an imaging optics (24) positioned after the laser emitter array (10) and receiving the multi-wavelength beam (27) to generate imaged beams;
a first optical transform lens (16) positioned about one focal length from the laser emitter array (10) and receiving the multi-wavelength beam (27) and spatially overlapping the multi-wavelength beam (27) in a first dimension;
a first dispersive element (18) having a wavelength dependent dispersion in the first dimension and following the first optical transform lens (16) and receiving the spatially overlapped beams and generating parallel beams in the first dimension;
a deflective array (26) following the first dispersive element (18), wherein the imaging optics (24) are configured to reimage in at least one dimension a scaled image of the optical field near the laser emitter array (10) to a location near the deflective array (26), the deflective array (26) receiving the parallel beams and generating deflected beams in a first dimension;
a second optical transform lens (20) positioned approximately a focal length from the first dispersive element (18) and configured to receive the multi-wavelength beam (27) and to spatially overlap the optical beams in a second dimension forming a second region of overlap at the second dispersive element (22), the second optical transform lens (20) receiving the deflected beams and generating transformed beams; and
a second dispersive element (22) following the second optical transform lens 28 (20) and having wavelength dependent dispersion in a second dimension and configured to receive the transformed beams and transmit a multi-wavelength output beam (28) comprising the a plurality of spatially overlapped optical beams; and
the first and second dimensions are orthogonal such that the deflective array (26) generates deflected beams by deflecting the beams in a plane orthogonal to a plane of dispersion of the second dispersive element (22).
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Abstract
An apparatus and method for two-dimensional wavelength beam combining of a plurality of laser sources. In one embodiment, an external cavity multi-wavelength laser comprises an array of laser gain elements, two optical transform lenses, two dispersive elements, an imaging system, a deflective array, and an output coupler. First and second optical transform lenses spatially overlap optical beams in first and second dimensions forming regions of overlap at the first and second dispersive elements. The deflective array comprises a plurality of mirrors wherein each mirror deflects and rearranges the optical beams from a common row. The dispersive elements introduce wavelength discrimination that when combined with the output coupler, provide the required feedback gain. The output coupler creates a single output port for the plurality of external optical cavities established in unison with the plurality of laser emitters. The output coupler transmits a multi-wavelength output beam comprising spatially overlapped coaxial optical beams.
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Citations
28 Claims
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1. A multi-wavelength laser device comprising:
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a plurality of laser emitters (14), wherein each laser emitter (14) produces optical radiation having a different wavelength; a laser emitter array (10) comprising the plurality of laser emitters (14) wherein the plurality of laser emitters (14) are arranged in a two-dimensional pattern; a multi-wavelength beam (27) comprising a plurality of multi-wavelength row beams (29), each of the multi-wavelength row beams (29) emanating from the plurality of laser emitters (14) within a laser emitter row (12); an imaging optics (24) positioned after the laser emitter array (10) and receiving the multi-wavelength beam (27) to generate imaged beams; a first optical transform lens (16) positioned about one focal length from the laser emitter array (10) and receiving the multi-wavelength beam (27) and spatially overlapping the multi-wavelength beam (27) in a first dimension; a first dispersive element (18) having a wavelength dependent dispersion in the first dimension and following the first optical transform lens (16) and receiving the spatially overlapped beams and generating parallel beams in the first dimension; a deflective array (26) following the first dispersive element (18), wherein the imaging optics (24) are configured to reimage in at least one dimension a scaled image of the optical field near the laser emitter array (10) to a location near the deflective array (26), the deflective array (26) receiving the parallel beams and generating deflected beams in a first dimension; a second optical transform lens (20) positioned approximately a focal length from the first dispersive element (18) and configured to receive the multi-wavelength beam (27) and to spatially overlap the optical beams in a second dimension forming a second region of overlap at the second dispersive element (22), the second optical transform lens (20) receiving the deflected beams and generating transformed beams; and a second dispersive element (22) following the second optical transform lens 28 (20) and having wavelength dependent dispersion in a second dimension and configured to receive the transformed beams and transmit a multi-wavelength output beam (28) comprising the a plurality of spatially overlapped optical beams; and the first and second dimensions are orthogonal such that the deflective array (26) generates deflected beams by deflecting the beams in a plane orthogonal to a plane of dispersion of the second dispersive element (22). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of two-dimensional wavelength beam combining in a laser system, the method comprising:
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generating a multi-wavelength beam (27) using an emitter array (10); bending individual wavelength beams within row beams of the multi-wavelength beam (27) to be mutually parallel and overlapping in a first dimension using a first dispersive element (18); deflecting the mutually parallel and overlapping in the first dimension beams to be mutually parallel and overlapping in the first dimension using a deflective array (26), bending the mutually parallel and overlapping in the first dimension beams in a second dimension in a second dispersive element (22) to generate a multi-wavelength output beam (28), wherein the first and second dimensions are orthogonal such that deflecting the mutually parallel and overlapping in the first dimension beams occurs in a plane orthogonal to a plane of dispersion of the second dispersive element (22). - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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28. A method of two-dimensional wavelength beam combining in a laser system, the method comprising:
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generating a multi-wavelength beam (27) using an emitter array (10); bending individual wavelength beams within row beams of the multi-wavelength beam (27) to be mutually parallel and overlapping in a first dimension using a first dispersive element (18); bending the mutually parallel and overlapping in the first dimension beams in a second dimension in a second dispersive element (22) to generate a multi-wavelength output beam (28), wherein the first and second dimensions are orthogonal; and deflecting all of the beams in a first dimension such that deflecting occurs in a plane orthogonal to a plane of dispersion of the second dispersive element within each row of the multi-wavelength beam (27) in the first dimension to make all of the individual beams forming the multi-wavelength output beam (28) to be parallel and overlapping using a deflective array (26).
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Specification