Fiber with depressed central index for increased beam parameter product

A technology of parameter product and refractive index, applied in the direction of multi-layer core/cladding optical fiber, cladding optical fiber, optics, etc., can solve the problems of lacking and reducing beam quality, etc.

Active Publication Date: 2018-04-17
NLIGHT INC
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Although methods for maximizing laser beam quality have received much attention,...

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  • Fiber with depressed central index for increased beam parameter product
  • Fiber with depressed central index for increased beam parameter product
  • Fiber with depressed central index for increased beam parameter product

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[0016] As used in this application and in the claims, the singular terms "a," "an," and "the" include the plural unless the context clearly dictates otherwise. Furthermore, the term "includes" means "includes." Furthermore, the term "coupled" does not exclude the presence of intervening elements between coupled items.

[0017] The systems, apparatus, and methods described herein should not be construed as limiting in any way. On the contrary, the present disclosure relates to all novel and non-obvious features and aspects of the various disclosed embodiments, individually and in various combinations and subcombinations with each other. The disclosed systems, methods, and apparatus are not limited to any particular aspect or feature, or combination thereof, nor do the disclosed systems, methods, and apparatus require any one or more particular advantages or problems to be solved. Any theory of operation is provided for ease of explanation, but the disclosed systems, methods a...

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Abstract

A method includes generating a multimode laser beam having an initial beam parameter product (bpp) and directing the multimode laser beam to an input end of a fiber so as to produce an output beam atan output of the fiber with a final bpp that is greater than the initial bpp. Another method includes measuring a base bpp associated with a multimode laser beam generated from a laser source and emitted from an output fiber output end, determining a bpp increase for the multimode laser beam, and selecting a bpp increasing optical fiber having an input end and an output end so that the multimode laser beam with the base bpp coupled to the input end has an output bpp at the output end of the bpp increasing optical fiber corresponding to the determined bpp increase.

Description

[0001] Cross-references to related patent applications [0002] This application claims the benefit of US Provisional Application 62 / 190,047, filed July 8, 2015, which is incorporated herein by reference. technical field [0003] This field involves optical fibers in laser systems. Background technique [0004] In many laser system applications, superior laser performance often requires superior laser beam quality. While a Gaussian beam profile corresponding to the highest achievable beam quality is generally required, many applications in laser processing and materials processing can benefit from having beam profiles with other shapes. Additionally, various steps in the laser processing supply chain can benefit from having predictable beam quality. Although methods for maximizing laser beam quality have received much attention, methods for fabricating lasers with specific reduced beam quality are still lacking. Therefore, solutions to overcome these deficiencies are need...

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Application Information

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IPC IPC(8): G02B6/036H01S3/067
CPCG02B6/03611H01S3/005H01S3/06729
Inventor R·L·法罗C·A·里韦拉
Owner NLIGHT INC
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