Phase-locking and self-imaging properties of a Talbot resonator applied to circular structures

Wrage, M.; Glas, P.; Leitner, Martin; Vysotsky, D. V.; Napartovich, Anatoly P.

doi:10.1016/s0030-4018(01)01138-5

Cited by 15 publications

(13 citation statements)

References 17 publications

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“…In results of γ m variation the supermodes possess different self-imaging properties [3]. It is principle of MCF mode selection in an external Talbot cavity.…”

Section: Talbot Resonatormentioning

confidence: 99%

“…If radiation from all microcores is mutual coherent and laser resonator mirror is placed at the distance (1/2)Z T due to self-imaging provides good reflection. The comprehensive description of the self-imaging, mode selecting and possibility of phase--locking using Talbot cavity has been recently demonstrated [2,3,6]. …”

Section: Talbot Resonatormentioning

confidence: 99%

“…Multicore optical fibre (MCF) makes it possible to reduce the fibre length necessary to absorb the pump radiation and increase the maximum laser output power [1]. The major disadvantage of such construction of emitter array is low beam brightness [2,3]. It is caused by lack of coherence between radiation from individual cores.…”

Section: Introductionmentioning

confidence: 99%

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Multicore Optical Fibres for an External Talbot Cavity

2009

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In the paper the application of multicore optical fibres in phased-locked high power lasers is presented. The manufacturing and properties of multicore active optical fibres were presented. The thermally stable aluminosilicate glass doped with Nd 3+ (0.5 mol%) ions were melted and used as cores in manufactured multicore optical fibres. Two configurations of double clad multicore optical fibres with the circular array containing 15 and 30 Nd 3+ doped cores on ring inside a large pump clad were realized. Absorption and luminescence spectra of obtained glasses and fibres were presented. An external plane mirror located at certain distance of the array forms the basic Talbot cavity. The possibilities of mode selection and phase-locking by using Talbot resonator applied to fabricated multicore fibres were investigated.

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“…In results of γ m variation the supermodes possess different self-imaging properties [3]. It is principle of MCF mode selection in an external Talbot cavity.…”

Section: Talbot Resonatormentioning

confidence: 99%

Section: Talbot Resonatormentioning

confidence: 99%

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Multicore Optical Fibres for an External Talbot Cavity

2009

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“…In these fibres, the number of doping rare earth element ions is greater than in typical singlecore fibres, proportionally to the number of cores. Moreover, placing multiple cores in fibre cladding makes it possible to reduce the length of the fibre which is necessary to absorb the pumping radiation [7][8][9][10][11][12][13]. If the radiation generated in individual cores is coherent, then in the far-field diffraction pattern a centrally located peak of high intensity and low divergence (i.e.…”

Section: Introductionmentioning

confidence: 99%

Phase-locking of 19-core Yb3+ - doped optical fibre

Kochanowicz¹,

Dorosz²,

Zając³

2011

Bulletin of the Polish Academy of Sciences: Technical Sciences

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Abstract. The supermode generation in a multicore optical fibre laser can be realised by phase-locking of radiation inside of the fibre. The model proposed by authors implies the achievement of supermode generation by exchanging radiation between the cores during the development of the laser action. The analysis of the impact of coupling value between the cores on phase radiation of particular emitters was considered. In the paper the phase-locking of 19-core optical fibre doped with Yb 3+ ions is presented. The analysis of material and geometrical parameters of the active 19 -core optical fibre and phase deviation on the beam quality factor of the laser beam in the far-field diffraction region has been analysed. The beam quality factor of the manufactured multicore fibre equals BQF = 0.71, V = 2.4, d = 18 µm. As a result of the conducted analysis a double-clad 19 -cores optical fibre doped with ytterbium ions has been designed and fabricated and its luminescence spectra and far-field diffraction pattern have been measured. Registered in the experiment in MOFPA system far-field pattern showed centrally located peak of relatively high radiation intensity together with smaller side-lobes, and as such was similar to the pattern which had been obtained numerically.

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“…In the classical double clad active fibre it can be collected relatively small amount of energy mainly because of thin core (single mode operation) and clustering phenomena. In order to increase RE concentration LMA fibres were developed [1][2][3][4][5][6][7][8]. The other way to increase active dopant in the optical fibres can be realised in multicore optical fibre.…”

Section: Introductionmentioning

confidence: 99%

Beam Quality of Multicore Fibre Lasers

et al. 2010

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In the paper the beam quality of the phase-locked multicore fibre lasers was investigated. The beam quality factor (BQF) of the coherently combined beam of the multicore fibre lasers should be determinate as the laser optical output power in a central peak far-field bucket divided by the total optical output power radiating from the effective near-field. Classical M 2 factor is not proper for evaluating the beam quality of phase-locked multicore fibre lasers because it degrades with the increasing number of cores. The beam quality factor of the manufactured multicore fibres equals: 7-core hexagonal structure fibre (BQF = 0.71, V = 2.4), 5-core (BQF = 0.70, V = 2.4), 30-core circular structure of core optical fibre laser possesses the lowest beam quality factor (BQF = 0.48, V = 2.4). However, the angular divergence of the central peak is reduced in proportion to the number of cores generating mutually coherent radiation. Numerical simulation shows that standard deviation of the phase error below 15• has an inconsiderable impact on the laser beam quality. The luminescence spectra of the fabricated constructions: 5-core, 7-core and 30-core double clad multicore optical fibres doped with Nd 3+ were measured.

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Phase-locking and self-imaging properties of a Talbot resonator applied to circular structures

Cited by 15 publications

References 17 publications

Multicore Optical Fibres for an External Talbot Cavity

Multicore Optical Fibres for an External Talbot Cavity

Phase-locking of 19-core Yb3+ - doped optical fibre

Beam Quality of Multicore Fibre Lasers

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