US 12,237,642 B2
Ultrahigh power fiber laser system with controllable output beam intensity profile
Eugene Scherbakov, Oxford, MA (US); Valentin Fomin, Oxford, MA (US); Andrey Abramov, Oxford, MA (US); Mikhail Abramov, Oxford, MA (US); and Dmitri Jagodkin, Oxford, MA (US)
Assigned to IPG PHOTONICS CORPORATION, Marlborough, MA (US)
Appl. No. 17/299,490
Filed by IPG PHOTONICS CORPORATION, Oxford, MA (US)
PCT Filed Dec. 3, 2019, PCT No. PCT/US2019/064251
§ 371(c)(1), (2) Date Jun. 3, 2021,
PCT Pub. No. WO2020/117816, PCT Pub. Date Jun. 11, 2020.
Claims priority of provisional application 62/774,846, filed on Dec. 3, 2018.
Prior Publication US 2022/0077648 A1, Mar. 10, 2022
Int. Cl. H01S 3/23 (2006.01)
CPC H01S 3/2383 (2013.01) 17 Claims
OG exemplary drawing
 
1. An all fiber ultra-high power all fiber laser system, comprising:
at least one central and peripheral fiber laser sources controlled to selectively output respective central and peripheral laser beams;
a tapered fiber-bundle of central guiding fiber and a plurality of peripheral guiding fibers receiving respective central and peripheral laser beams; and
a multicore delivery fiber receiving central and peripheral bears from the tapered fiber bundle and having:
spaced input and output tapered portions converging towards respective outer ends,
a mid-portion bridging the spaced tapered portions, and
concentric central and second cores extending between the outer ends of respective tapering portions and spaced radially from one another and coupled to respective central and peripheral guiding fibers of the combiner, wherein the central core has an outer core diameter matching or greater than that of the central guiding fiber, and
inner and outer claddings concentric with and sandwiching the second core; wherein one of the laser beams propagates along a first fixed path through spliced cores of the central guiding fibers and further through the central core of the delivery fibers, and the remaining laser beams propagate along a second fixed path through respective cores of peripheral guiding fibers and further through the second core of the delivery fiber.