First experimental demonstration of self-synchronous phase locking of an optical array

Shay, Thomas M.; Benham, Vincent; Baker, J. T.; Ward, Benjamin G.; Sanchez, Anthony D.; Culpepper, Mark A.; Pilkington, D.; Spring, Justin B.; Nelson, Douglas; Lu, Chunte A.

doi:10.1364/oe.14.012015

Cited by 181 publications

(69 citation statements)

References 9 publications

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“…Beams 1 and 2 are combined at beam splitter 1 and see the same phase front deformation 1 . Beams 3 and 4 see the same phase-front deformation 2 , beams 1, 2, 3, and 4 all see the same phase-front deformation 3 , and so on. A second scenario is illustrated in Fig.…”

Section: Effect Of Phase-front Deformationmentioning

confidence: 93%

“…Though single-mode fiber lasers with powers of ϳ1 kW are already commercially available, further increase of the power available from a single-mode fiber will be ultimately limited by nonlinear effects and material damage. Coherent beam combining (CBC) provides a promising approach to obviate this problem and thus further scale up a single beam's power by tens or hundreds of times without degrading the spectral purity and the beam quality [1][2][3][4]. By definition, CBC requires all the beams to have the same frequency and a stable relative phase.…”

Section: Introductionmentioning

confidence: 99%

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Coherent beam combining with multilevel optical phase-locked loops

et al. 2007

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Coherent beam combining (CBC) technology holds the promise of enabling laser systems with very high power and near-ideal beam quality. We propose and demonstrate a novel servo system composed of multilevel optical phase lock loops. This servo system is based on entirely electronic components and consequently can be considerably more compact and less expensive compared to servo systems made of optical phase/frequency shifters. We have also characterized the noise of a 1064 nm Yb-doped fiber amplifier to determine its effect on the CBC and studied theoretically the efficiency of combining a large array of beams with the filled-aperture implementation. In a proof-of-concept experiment we have combined two 100 mW 1064 nm semiconductor lasers with an efficiency of 94%.

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Section: Effect Of Phase-front Deformationmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Coherent beam combining with multilevel optical phase-locked loops

et al. 2007

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“…The coherent addition means that the optical phases of all the channels are locked, either in a passive way [1,2] or, using active phase lock loops (PLLs) [3][4][5]. This last approach, we chose for this work, is commonly preferred when a large number of fibres are considered (typically above 10 to 20).…”

Section: Introductionmentioning

confidence: 99%

“…First prerequisite for a PLL is to measure the phase perturbation between the propagation channels. This can be done using various techniques [3][4][5], among which we chose an interferometric approach, which has the advantages of being collective and scalable to potentially very high number of fibres (up to hundreds) [5].…”

Section: Introductionmentioning

confidence: 99%

PLAT4M: Progressing Silicon Photonics in Europe

et al. 2015

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Photonic integration is an appealing technology for emerging applications in communications, medical diagnostics and sensing. Silicon Photonics presents a highly attractive solution for large-scale photonic integration, principally because it is based on well-established CMOS-fabrication technologies. However, Silicon photonics can be difficult and expensive to implement, as it requires complex device design, fabrication and packaging capabilities. Photonic Libraries And Technology for Manufacturing (PLAT4M) is a major European project that brings together the key capabilities required to develop solutions for a range of Silicon photonic-based applications. This paper will present an overview of the PLAT4M project. It will present, in detail, a key application demonstrator (Coherent Beam Combiner), highlighting the ability of the project team to develop an integrated Silicon Photonic sub-system, from design, through to device fabrication, packaging and final test. The paper also highlights the need to consider additional capabilities besides device fabrication, such as packaging, which are critical to achieving fully operational sub-systems.

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“…In the CBC system, the phase modulator is a key component for phase modulation and control. At present, LiNbO 3 based phase modulators with high response frequency are widely Y. Ma · P. Zhou · K. Zhang · X. Wang · H. Ma · X. Xu · L. Si · Z. Liu ( ) · Y. Zhao College of Optoelectric Science and Engineering, National University of Defense Technology, Changsha 410073, China e-mail: zejinliu@vip.sina.com used in the CBC system based on multidithering technique or SPGD algorithm [1][2][3][4][5][6][7][8]. However, the insertion loss of available LiNbO 3 phase modulator is higher than 3 dB and the laser-induced damage threshold is lower than 200-mW presently [9,10].…”

Section: Introductionmentioning

confidence: 99%

A coherent beam combination system based on double PZT phase modulators

Zhang

et al. 2012

Appl. Phys. B

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A novel coherent beam combination system based on double piezoelectric ceramics transducer (PZT) phase modulators is presented and demonstrated for the first time. In this system, two different PZT phase modulators are used for high frequency phase modulation and low frequency phase control, respectively, while in previous demonstrated system, LiNbO 3 phase modulators are often employed. The inherent low insert loss and high laser-induced damage threshold of the PZT phase modulator makes the new proposed system more compact and stable. By the way, the experiment of coherent beam combination of two 5-W fiber laser beams based on double PZT phase modulators is done. In the experiment, the PZT phase modulator with 500-kHz frequency response point made in home is used for high frequency phase modulating and another one with 0∼30-kHz linear frequency response range for phase controlling. When the phase control system is in the closed loop, the fringe contrast of far-field intensity pattern is improved to be more than 90 % from 5 % in open loop.

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First experimental demonstration of self-synchronous phase locking of an optical array

Cited by 181 publications

References 9 publications

Coherent beam combining with multilevel optical phase-locked loops

Coherent beam combining with multilevel optical phase-locked loops

PLAT4M: Progressing Silicon Photonics in Europe

A coherent beam combination system based on double PZT phase modulators

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