Coherent combining in an Yb-doped double-core fiber laser

Boullet, Johan; Sabourdy, David; Desfarges‐Berthelemot, Agnès; Kermène, Vincent; Pagnoux, Dominique; Roy, Philippe; Dussardier, Bernard; Blanc, Wilfried

doi:10.1364/ol.30.001962

Cited by 23 publications

(4 citation statements)

References 15 publications

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“…Fiber lasers can be combined spectrally [4], coherently [5][6][7][8], or incoherently. In this paper we discuss some of the issues associated with coherent and incoherent beam combining and propose an incoherent beam combining configuration for long-range DE applications.…”

Section: Subject Termsmentioning

confidence: 99%

Incoherent Combining of High-Power Fibers Lasers for Long-Range Directed Energy Applications

Sprangle¹,

Peñano²,

Ting³

2006

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) SPONSOR I MONITOR'S ACRONYM(S)Office of Naval Research ONR One Liberty Center 11. SPONSOR / MONITOR'S REPORT 875 North Randolph St. We present a configuration for incoherently combining fiber lasers, which can be used for long-range directed energy applications. Unlike coherent beam combining approaches, incoherent combining does not require phase locking, the polarization of the lasers can be random, and the linewidths can be large. These relaxed requirements allow for the use of recently developed high-power (>2 kW/fiber), single mode, high quality (M 2 < 1.2) fiber lasers having relatively large linewidths (>1%). These high-power lasers cannot be used for coherent beam combining. The proposed incoherent combining configuration consists of a fiber laser array in which the beams diffract to a spot size of-4 cm onto individual collimating lenses. The collimated beams can be directed to a target many kilometers away by individual steering mirrors, which form the beam director. We present parameters for an incoherently combined laser system that can deliver 100 kW of CW power on a target area of 100 cm 2 at a range of 5 kin. The system has 49 fiber lasers and a beam director with transverse dimension 60 cm x 60 cm. This configuration is readily scalable to higher powers. NUMBER(S)Arlington

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Section: Subject Termsmentioning

confidence: 99%

Incoherent Combining of High-Power Fibers Lasers for Long-Range Directed Energy Applications

Sprangle¹,

Peñano²,

Ting³

2006

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“…Disadvantage of this work consists in the bulk element application. The coherent combining in an Yb-doped double-core fiber laser was observed in [5] due to the coupling via a biconical fused taper in a Michelson interferometric configuration. It is clear that in this scheme the taper is a "weak" place as well as in scheme utilizing the fiber coupler.…”

Section: Introductionmentioning

confidence: 99%

Fiber laser based on 4-core Yb-doped fiber and multimode Bragg grating

et al. 2006

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Abstract:We have realized and studied the fiber laser based on 4-core Yb-doped fiber and multimode Bragg grating as the input reflector. The lasing efficiency slope of 55% was measured. An investigation of the output emission has shown that the far-field pattern constitutes an interference picture. That allows us to conclude that the multimode Bragg grating provides phase locking of 4 lasers utilizing the different active cores. A coherent length of laser is longer than possible difference between optical ways of different active cores.Far-field interference pattern for 2-core lasing

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“…Along with a rapid progress in characteristics of single-core fiber lasers [1] much attention is paid these days to the problem of phase locking of multi-core fiber lasers [2][3][4][5][6]. This approach can lead to further increase of the emitting laser aperture with a constant wave field phase.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of the multicore fiber amplifier

Napartovich

Elkin

Troshchieva

et al. 2006

XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers

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We have developed a 3D beam propagation numerical code and applied it to simulations of 7(19)-core of hexagonal structure fiber amplifier experimentally studied recently. It was shown that the mechanism of phase synchronization of co-propagating beams is associated with mode filtering by gain spatial structure. The tolerance limits on micro-core parameter random variations for phase-locking taking place are numerically found for 7-core fiber amplifier with different random core index sets. It is shown that the smaller core index step stabilizes the phase locking effect. An original optical mode solver was developed. Spectra of modes and of their gain are studied for 7(19)-core fibers. Gain self-and cross-saturation effects are examined, and possibilities of core structure tailoring in order to increase singlemode stability are described.

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Coherent combining in an Yb-doped double-core fiber laser

Cited by 23 publications

References 15 publications

Incoherent Combining of High-Power Fibers Lasers for Long-Range Directed Energy Applications

Incoherent Combining of High-Power Fibers Lasers for Long-Range Directed Energy Applications

Fiber laser based on 4-core Yb-doped fiber and multimode Bragg grating

Numerical modeling of the multicore fiber amplifier

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