Coherently coupled high-power fiber arrays

Anderegg, Jesse; Brosnan, S. J.; Cheung, E.; Epp, P.; Hammons, D.A.; Komine, H.; Weber, M.; Wickham, Michael G.

doi:10.1117/12.650138

Cited by 123 publications

(50 citation statements)

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“…Several approaches like multi-core fiber lasers, intracavity coupling and master oscillator power amplifier (MOPA) configurations have been proposed and robust beam phasing of a small number of fiber lasers has been demonstrated [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Up to now, the highest-power demonstrations have involved active beam phasing with the MOPA configuration [7][8][9][10]. There are three kinds of active beam phasing method; heterodyne phase detecting [4][5][6][7][8], multi-dithering technique [9,10] and the stochastic optimization algorithm [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…In coherent beam phasing, multiple lasers are packaged into an array in which all of the array elements operate at the same wavelength, and the relative phases of the elements are controlled. Several approaches like multi-core fiber lasers, intracavity coupling and master oscillator power amplifier (MOPA) configurations have been proposed and robust beam phasing of a small number of fiber lasers has been demonstrated [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Up to now, the highest-power demonstrations have involved active beam phasing with the MOPA configuration [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Up to now, the highest-power demonstrations have involved active beam phasing with the MOPA configuration [7][8][9][10]. There are three kinds of active beam phasing method; heterodyne phase detecting [4][5][6][7][8], multi-dithering technique [9,10] and the stochastic optimization algorithm [11][12][13][14][15]. Coherent beam phasing using the stochastic optimization algorithm is considered to be of great potential as it introduces less complexity while maintaining the capability for scaling to a large number of beamlets.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Bandwidth analysis and improvement of the beam phasing of fiber amplifiers using the stochastic parallel gradient descent algorithm

Zhang

Liu

et al. 2010

Optics & Laser Technology

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Bandwidth analysis and improvement of the beam phasing of fiber amplifiers using the stochastic parallel gradient descent algorithm

Zhang

Liu

et al. 2010

Optics & Laser Technology

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“…With recent advances in beam combining technology, laser arrays are becoming a viable alternative for high power, high beam quality laser systems. Beam combinations of laser arrays using various techniques such as the Talbot cavity 2 , structured mirrors 3 , self-imaging resonator 4 , and active phase correction 5 have been proposed. However, there still exists the limitation that a significant percentage of energy resides in undesired sidelobes of the far field of phase-locked laser arrays.…”

Section: Introductionmentioning

confidence: 99%

Improvement of combining efficiency of coherent beam combination from phase-locked laser array by Dammann grating

Yan

et al. 2011

SPIE Proceedings

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An efficient technique of utilizing Dammann grating and phase plate to get high power and high brightness laser beam from phase-locked laser array is presented. The conjugate Dammann grating and the phase plate are placed in the back and front focal plane of a Fourier lens respectively. In order to improve the beam combining efficiency, Continuous grating of high diffraction efficiency is used to replace the Dammann grating. Analysis shows that the Continuous grating which has a higher diffraction of efficiency is also suitable for beam combining of the presented system.

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“…There have been a number of experimental and theoretical research efforts addressing the need the for very high brightness fiber laser sources. The technical approaches that have been attempted include the optical self-organized[1,2,3], nonlinear optical[4], and RF phase locking methods [5,6,7,8,9,10]. To date RF phase locking techniques have demonstrated both high beam quality and the highest powers[9] of any beam combination technique.…”

mentioning

confidence: 99%

Self-Synchronous Coherent Beam Combination

Shay¹

2006 Digest of the LEOS Summer Topical Meetings

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A completely novel concept for coherent beam combination is presented. The technique completely eliminates the need for a reference beam resulting in a dramatic simplification of electronic coherent beam combination without any compromise in performance.OCIS codes: 140.3290; 140.3510 INTRODUCTIONTo achieve the high brightness's required for many laser applications it is necessary to phase lock multiple element fiber optical arrays. The intensity and hence the powers available from single-mode optical fibers are limited by optical surface damage or nonlinear optical effects. These limitations can be overcome by coherent beam combining of the output power from multiple optical fibers. Accurate control of the optical phase is required for any multi-fiber approach. In a master oscillator power amplifier configuration, the optical paths of each of the fibers must be locked to within a fraction of the wavelength in order to coherently combine the individual outputs into a single, high-power beam. As a result of time varying thermal loads and other disturbances, active feedback is required in order to provide for coherent addition of the beams from the array elements. There have been a number of experimental and theoretical research efforts addressing the need the for very high brightness fiber laser sources. The technical approaches that have been attempted include the optical self-organized[1,2,3], nonlinear optical[4], and RF phase locking methods [5,6,7,8,9,10]. To date RF phase locking techniques have demonstrated both high beam quality and the highest powers[9] of any beam combination technique. All of the RF phase locking methods by other researchers [5,6,7,8,9] have required both an external reference beam and one photodetector per array element. A unique feature of our previous work was the first demonstration of a novel electronic phase locking technique that used only a single photodetector [10]. In this paper, we present the first RF phase locking technique that eliminates the need for a reference beam. This new architecture for coherent beam combination results in considerable simplifications compared to previous RF phase locking systems. For the new method that is called self-synchronous locking of optical coherence by single-detector electronic-frequency tagging (SS-LOCSET) there is no reference beam wavefront to match co-align with the array element wavefronts and in addition only a single photodetector is needed so there is no need to spatially isolate the light from a single array element from adjacent photodetectors. The self-synchronous LOCSET technique provides a dramatic simplification in the experimental system without any compromise in system performance. Furthermore, this is the first phased array locking technique that doesn't require an external reference beam.

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Coherently coupled high-power fiber arrays

Cited by 123 publications

References 0 publications

Bandwidth analysis and improvement of the beam phasing of fiber amplifiers using the stochastic parallel gradient descent algorithm

Bandwidth analysis and improvement of the beam phasing of fiber amplifiers using the stochastic parallel gradient descent algorithm

Improvement of combining efficiency of coherent beam combination from phase-locked laser array by Dammann grating

Self-Synchronous Coherent Beam Combination

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