Microchip - Yb fiber hybrid optical amplifier for micro-machining and marking
First Claim
1. An optical amplifier, comprising:
- a single mode light source; and
a multimode fiber amplifier having a dopant concentration area within a core thereof which is smaller than a diameter of said core, such that said amplifier preferentially propagates single mode light.
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Accused Products
Abstract
The invention describes techniques for the control of the spatial as well as spectral beam quality of multi-mode fiber amplification of high peak power pulses as well as using such a configuration to replace the present diode-pumped, Neodynium based sources. Perfect spatial beam-quality can be ensured by exciting the fundamental mode in the multi-mode fibers with appropriate mode-matching optics and techniques. The loss of spatial beam-quality in the multi-mode fibers along the fiber length can be minimized by using multi-mode fibers with large cladding diameters. Near diffraction-limited coherent multi-mode amplifiers can be conveniently cladding pumped, allowing for the generation of high average power. Moreover, the polarization state in the multi-mode fiber amplifiers can be preserved by implementing multi-mode fibers with stress producing regions or elliptical fiber cores These lasers find application as a general replacement of Nd: based lasers, especially Nd:YAG lasers. Particularly utility is disclosed for applications in the marking, micro-machining and drilling areas.
115 Citations
14 Claims
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1. An optical amplifier, comprising:
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a single mode light source; and
a multimode fiber amplifier having a dopant concentration area within a core thereof which is smaller than a diameter of said core, such that said amplifier preferentially propagates single mode light.
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2. An optical amplifier, comprising:
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a single mode light source;
means for coupling said single mode light into a multimode fiber amplifier; and
a core of said multimode fiber amplifier having a dopant profile such that gain is substantially confined to a fundamental mode propagating therethough.
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3. An optical amplifier, comprising:
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a single mode light source; and
a multimode fiber amplifier having a dopant profile wherein higher concentrations of dopant reside within a central region of a core thereof, as compared with that at peripheral regions of said core, to preferentially amplify single mode light.
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4. An optical amplifier, comprising:
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a single mode light source; and
a multimode fiber amplifier having a dopant concentration area within a region thereof which is smaller than a diameter of said core, to guide and amplify single mode light.
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5. An optical amplifier, comprising:
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a single mode light source; and
a multimode fiber amplifier having a dopant concentration area within a region thereof which is smaller than a diameter of said core, to preferentially amplify single mode light.
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6. A single mode optical amplifier, comprising:
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a single mode light source; and
a doped, pumped fiber amplifier receiving an output of said light source, and exhibiting a gain-guiding characteristic by confining a dopant concentration therein to a center portion of a core thereof.
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7. A single mode optical amplifier as claimed in claim 16, wherein said dopant concentration is confined within an area of said core having a diameter which is substantially half the diameter of said core.
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8. A single mode optical amplifier as claimed in claim 16, wherein said dopant concentration is confined within an area of said core having a diameter of approximately 25 microns, said core having a diameter of approximately 50 microns.
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9. A single mode optical amplifier, comprising:
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a single mode light source; and
a doped, pumped fiber amplifier receiving an output of said light source, and having a gain sufficient to exhibit a gain-guiding characteristic such that a gain profile thereof determines the single mode profile of the guided light.
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10. A single mode optical amplifier, comprising:
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a single mode light source; and
a doped, pumped fiber amplifier receiving an output of said light source, and having a gain sufficient to exhibit a gain-guiding characteristic such that single mode light propagating within said fiber amplifier is confined to a central portion of a core of said fiber due solely to a gain profile thereof.
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11. A single mode optical amplifier, comprising:
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a single mode light source; and
a doped, pumped fiber amplifier receiving an output of said light source, and having a gain sufficient to exhibit a gain-guiding characteristic such that a gain profile thereof determines the single mode profile of the guided light, to the exclusion of a normal single mode profile of a fiber core thereof.
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12. A single mode optical amplifier, comprising:
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a single mode light source; and
a doped, pumped fiber amplifier receiving an output of said light source, and means for reducing an alignment tolerance of the light source with respect to said fiber amplifier, comprising a gain-guiding mechanism within said fiber amplifier.
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13. A single mode optical amplifier, comprising:
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a single mode light source; and
a doped, pumped fiber amplifier receiving an output of said light source, and means for tolerating a reduction in beam quality of said light source, comprising a gain-guiding mechanism within said fiber amplifier.
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14. An optical amplifier, comprising:
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a single mode light source;
means for coupling said single mode light into a multimode fiber amplifier; and
a core of said multimode fiber amplifier having a dopant profile wherein the doping is predominately at the center of said core and has a significantly smaller diameter than said core, such that said multimode fiber amplifier outputs predominately in a fundamental mode thereof.
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Specification