Passive phasing of fiber amplifiers
First Claim
1. A system for passive phasing of fiber amplifiers, comprising:
- an array of fiber amplifiers including a plurality of fiber amplifiers, the array of fiber amplifiers emitting a beam; and
an optical device placed at a far-field of the array of fiber amplifiers, wherein the optical device couples a first portion of the emitted beam back into the array of fiber amplifiers through a coupling hole, and wherein only the first portion of the emitted beam propagates through the coupling hole, wherein the optical device is placed around a central lobe on an optical axis of the array of fiber amplifiers, wherein the optical device is a collimating mirror, and wherein the array of fiber amplifiers are configured as a ring with a transmitting end and a receiving end of the array of fiber amplifiers being positioned toward each other to form the ring.
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Accused Products
Abstract
A method passively locks and phases an array of fiber amplifiers in a fiber amplifier system that emits a beam, such as a laser beam. The method locks the fiber amplifiers so that the fiber amplifiers operate at same or similar frequencies. The method samples a small portion of the emitted beam in a far-field around a central lobe on an optical axis and then couples this portion of emitted beam back into the array of fiber amplifiers. The fiber amplifiers may be phased so that the emitted beam concentrates its energy around the central lobe in the far-field. Phasing may be achieved by using an aperture, for example, to restrict the portion of the emitted beam to be coupled back to a restricted region around the optical axis.
26 Citations
17 Claims
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1. A system for passive phasing of fiber amplifiers, comprising:
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an array of fiber amplifiers including a plurality of fiber amplifiers, the array of fiber amplifiers emitting a beam; and an optical device placed at a far-field of the array of fiber amplifiers, wherein the optical device couples a first portion of the emitted beam back into the array of fiber amplifiers through a coupling hole, and wherein only the first portion of the emitted beam propagates through the coupling hole, wherein the optical device is placed around a central lobe on an optical axis of the array of fiber amplifiers, wherein the optical device is a collimating mirror, and wherein the array of fiber amplifiers are configured as a ring with a transmitting end and a receiving end of the array of fiber amplifiers being positioned toward each other to form the ring. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for passive phasing of fiber amplifiers, comprising:
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an array of fiber amplifiers including a plurality of fiber amplifiers, the array of fiber amplifiers emitting a beam and configured as a ring with a transmitting end and a receiving end of the array of fiber amplifiers being positioned toward each other to form the ring; a collimating mirror placed at a far-field of the array of fiber amplifiers, wherein the collimating mirror couples a first portion of the emitted beam back into the array of fiber amplifiers through a coupling hole, and wherein only the first portion of the emitted beam propagates through the coupling hole; and an array of pre-amplifiers that amplifies the first portion of the emitted beam before coupling the first portion of the emitted beam to the array of fiber amplifiers. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification