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An apparatus and method that provides management and cooling of an optical fiber by looping the optical fiber around the inner surface of a heat-conductive cylinder and around the outer surface of the heat-conductive cylinder, such that the optical fiber enters and exits the heat-conductive cylinder

An apparatus and method that provides management and cooling of an optical fiber by looping the optical fiber around the inner surface of a heat-conductive cylinder and around the outer surface of the heat-conductive cylinder, such that the optical fiber enters and exits the heat-conductive cylinder on substantially the same plane. Some embodiments use a continuous groove on the inside and outside of the cylinder for guiding and managing the optical fiber. Some embodiments use a plurality of protruding fiber guides for guiding and managing the optical fiber. Some embodiments use an integrated tube for guiding and managing the optical fiber. In some embodiments, the optical fiber looped on the inner surface and outer surface are spaced apart substantially equally. In some other embodiments, the optical fiber loops are spaced further apart for portions of the fiber carrying higher power.

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1. A method for cooling an optical gain fiber, the method comprising: providing the optical gain fiber;providing an optical-fiber-contact body having an inwardly facing surface and an outwardly facing surface on opposite sides of a heat-conductive material, wherein the outwardly facing surface inclu

1. A method for cooling an optical gain fiber, the method comprising: providing the optical gain fiber;providing an optical-fiber-contact body having an inwardly facing surface and an outwardly facing surface on opposite sides of a heat-conductive material, wherein the outwardly facing surface includes a surface feature that spaces apart a plurality of loops of the optical gain fiber;guiding the fiber at a first end of the optical-fiber-contact body through the optical-fiber-contact body to the inwardly-facing surface;looping the fiber in a plurality of loops in thermal contact with the inwardly facing surface of the optical-fiber-contact body in a direction from the first end of the optical-fiber-contact body towards a second end of the optical-fiber-contact body;guiding the fiber at the second end of the optical-fiber-contact body from the inwardly facing surface, through the optical-fiber-contact body from the inwardly facing surface to the outwardly facing surface; andwinding the fiber in a plurality of loops in thermal contact with the outwardly facing surface of the optical-fiber-contact body in a direction from the second end of the optical-fiber-contact body towards the first end of the optical-fiber-contact body. 2. The method of claim 1, further comprising: providing at least one heat sink; andattaching the at least one heat sink to the optical-fiber-contact body. 3. The method of claim 1, wherein at least a portion of the fiber is doped with a gain species, the method further comprising: introducing pump light into the fiber;introducing signal light into the fiber; andamplifying the signal light with the pump light and the gain species in the fiber. 4. The method of claim 1, wherein at least a portion of the fiber is doped with a gain species, the method further comprising: introducing more than one kilowatt of pump-light power into the gain fiber;introducing a laser seed signal into the fiber; andamplifying the laser seed signal using the pump light and the gain species in the fiber and outputting the amplified signal. 5. The method of claim 1, wherein the fiber is a double-clad gain fiber having a core and a first cladding layer, wherein the core is doped with a gain species, the method further comprising: introducing pump light into the first cladding layer such that the pump light propagates into the core;introducing signal light into the core; andamplifying the signal light with the pump light in the core. 6. The method of claim 1, wherein a cross section of the optical-fiber-contact body has a substantially circular inner circumference and a substantially circular outer circumference. 7. The method of claim 1, wherein the optical-fiber-contact body includes a plurality of substantially identical optical-fiber-contact sections attached end-to-end with one another. 8. The method of claim 1, further comprising: providing a first optical component, a second optical component, and a mounting substrate;mounting the first optical component, the second optical component, and the optical-fiber-contact body to a first face of the mounting substrate;connecting the first optical component to a first end of the fiber, wherein the first end of the optical fiber is in a first plane substantially parallel to the first face of the mounting substrate; andconnecting the second optical component to a second end of the fiber, wherein the second end of the optical fiber is also in the first plane substantially parallel to the first face of the mounting substrate. 9. The method of claim 1, wherein the optical-optical-fiber-contact body has an active cooling structure in contact with the optical-fiber-contact body. 10. The method of claim 1, further comprising providing an active cooling structure embedded inside of the optical-fiber-contact body. 11. An apparatus for holding and cooling an optical fiber, the apparatus comprising: an optical-fiber-contact body having an inwardly facing surface and an outwardly facing surface on opposite sides of a heat-conductive material, wherein the optical-fiber-contact body has a first end and a substantially opposite second end and the outwardly facing surface includes a surface feature that spaces apart a plurality of loops of the optical fiber;an optical gain fiber, wherein the optical gain fiber has a plurality of loops in thermal contact with the inwardly facing surface of the optical-fiber-contact body in a direction from the first end of the optical-fiber-contact body towards the second end of the optical-fiber-contact body, and the optical gain fiber has a plurality of loops in thermal contact with the outwardly facing surface of the optical-fiber-contact body in a direction from the second end of the optical-fiber-contact body towards the first end of the optical-fiber-contact body. 12. The apparatus of claim 11, wherein a cross section of the optical-fiber-contact body has a substantially circular inner circumference and a substantially circular outer circumference, and wherein the optical-fiber-contact body first end and the opposite second end have a central axis of the body that passes between the first end and the second end. 13. The apparatus of claim 11, further comprising at least one heat sink having a plurality of fins and attached to the optical-fiber-contact body. 14. The apparatus of claim 11, wherein the optical-fiber-contact body includes a plurality of substantially identical optical-fiber-contact sections attached end-to-end to one another. 15. The apparatus of claim 11, wherein the optical-fiber-contact body includes a first transition end section and a second transition end section and a plurality of substantially identical optical-fiber-contact sections attached end-to-end to one another between the first transition end section and the second transition end section, the apparatus further comprising: a heat sink attached to the optical-fiber-contact body. 16. The apparatus of claim 11, wherein the optical-fiber-contact body includes a first transition end section and a second transition end section and a plurality of substantially identical optical-fiber-contact sections attached end-to-end to one another between the first transition end section and the second transition end section, the apparatus further comprising: a heat-sink base attached to the optical-fiber-contact body, wherein the optical fiber has a first fiber end and a second fiber end, wherein the first end of the optical fiber is placed against the heat-sink base, the optical fiber is located between an inwardly facing surface and an outwardly facing surface of the first transition end section and is looped in a plurality of side-by-side loops along the inwardly facing surface from the first end to the second end, wherein the optical fiber is fed from the inwardly facing surface, between the outwardly facing surface and the inwardly facing surface of the second transition end section, and the optical fiber is looped in a plurality of side-by-side loops along the outwardly facing surface from the second end to the first end, and wherein the second end of the optical fiber is placed on the heat sink base. 17. The apparatus of claim 11, wherein the inwardly facing surface includes a first helical groove for receiving the plurality of loops of the fiber, the first helical groove traveling in a direction from the first end to the second end. 18. The apparatus of claim 11, wherein the outwardly facing surface includes a second helical groove for receiving the plurality of loops of the fiber, the second helical groove traveling in a direction from the second end to the first end. 19. The apparatus of claim 11 further comprising: a heat sink configured to go over the outwardly facing surface and clamp securely to the optical-fiber-contact body. 20. An apparatus comprising: an optical gain fiber;an optical-fiber-contact body having an inwardly facing surface and an outwardly facing surface on opposite sides of a heat-conductive material, wherein the outwardly facing surface includes a surface feature that spaces apart a plurality of loops of the optical gain fiber;means for guiding the fiber at a first end of the optical-fiber-contact body through the optical-fiber-contact body to the inwardly-facing surface;means for looping the fiber in a plurality of loops in thermal contact with the inwardly facing surface of the optical-fiber-contact body in a direction from the first end of the optical-fiber-contact body towards a second end of the optical-fiber-contact body;means for guiding the fiber at the second end of the optical-fiber-contact body from the inwardly facing surface, through the optical-fiber-contact body from the inwardly facing surface to the outwardly facing surface; andmeans for guiding the fiber in a plurality of loops wound in thermal contact with the outwardly facing surface of the optical-fiber-contact body in a direction from the second end of the optical-fiber-contact body towards the first end of the optical-fiber-contact body.