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US 2019/0199050 A1Published application
Method and apparatus for ensuring a uniform temperature profile in ribbon fiber lasers and amplifiers
AssigneeLawrence Livermore National Security, LLC
InventorsDerrek R. Drachenberg, Jay W. Dawson, Michael J. Messerly, Paul H. Pax
Life of this patent
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Abstract
A uniform temperature profile is provided across the width of the core of a ribbon fiber laser or amplifier by the use of insulating elements at the core edges and a spatially variable gain in the fiber core. High average power ribbon fibers, enable a variety of applications such as practical laser cutting and beam combining.
Claims30
A ribbon fiber, comprising:
- a core including a rare earth dopant and having a length and further including an aspect ratio that is orthogonal to said length, wherein said aspect ratio comprises a long aspect that is orthogonal to a relatively shorter aspect, wherein the concentration of said rare earth dopant varies across said long aspect, wherein said long aspect spans a first edge of said core and a second edge of said core;
- means for guiding light within said core;
- and
- one or more heat insulating elements configured for flattening the thermal profile of said core.
1 more element
An apparatus, comprising:
- a core including a rare earth dopant and having a cross-sectional area that is orthogonal to the length of said core, wherein the concentration of said rare earth dopant varies across a dimension of said cross sectional area;
- means for guiding light within said core;
- and
- one or more heat insulating elements configured for flattening the thermal profile of said core across said dimension.
1 more element
A ribbon fiber, comprising:
- a length of optically transmissive material having a spatially varying rare earth dopant concentration across the long dimension of the cross-sectional area of said length;
- a cladding surrounding said material and configured for guiding light within said material;
- and
- at least one air layer configured for flattening the thermal profile of said material across said long dimension.
1 more element
A method for fabricating a ribbon fiber, comprising:
- forming a core including a rare earth dopant and having a length and an aspect ratio that is orthogonal to said length, wherein said aspect ratio comprises a long aspect that is orthogonal to a relatively shorter aspect, wherein the concentration of said rare earth dopant varies across said long aspect, wherein said long aspect spans a first edge of said core and a second edge of said core;
- operatively contacting to said core a means for guiding light within said core;
- and
- operatively contacting to said means for guiding light one or more heat insulating elements configured for flattening the thermal profile of said core.
1 more element
A method, comprising:
- forming a core including a rare earth dopant and having a cross sectional area that is orthogonal to the length of said core, wherein the concentration of said rare earth dopant varies across a dimension of said cross sectional area;
- operatively connecting to said core a means for guiding light within said core;
- and
- operatively connecting to said means for guiding light one or more heat insulating elements configured for flattening the thermal profile of said core across said dimension.
1 more element
A method, comprising:
- providing an apparatus including:
- a core including a rare earth dopant and having a length and an aspect ratio that is orthogonal to said length, wherein said aspect ratio comprises a long aspect that is orthogonal to a relatively shorter aspect, wherein the concentration of said rare earth dopant varies across said long aspect, wherein said long aspect spans a first edge of said core and a second edge of said core;
- means for guiding light within said core;
- and
- one or more heat insulating elements configured for flattening the thermal profile of said core;
- and
- directing light into said core.
4 more elements
Dependencies are inferred from the claim text.