Research of Coherent Beam Combining Using Actively Phase-Controlling

Zejin, 刘泽金 Liu; Pu, 周朴 Zhou; Jing, 侯静 Hou; Xiaojun, 许晓军 Xu

doi:10.3788/cjl20093603.0518

Cited by 3 publications

(2 citation statements)

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“…Compared to continuous-wave(CW) fiber lasers, pulsed fiber laser has higher pulse energies and peak-power, simultaneity, the outstanding performance be maintained in terms of output power, beam quality, overall efficiency, and flexibility with regard to operating wavelength and radiation format [1,2,3,4,5] . That provides considerable potential to practical applications, such as most notably marking, precision machining, material processing, medical appliance, Lidar, space-communication, and so on [1,2,3] .It is one of the most important tendency from the high power CW fiber lasers up to high power pulsed fiber laser [3,7] ， and consequently high output power, high repetition rate, nanosecond pulse duration, high-brightness laser output become a hotspot for pulsed fiber laser's development.…”

Section: Introductionmentioning

confidence: 99%

“…Coherent beam combination(CBC) and incoherent beam combination provide one of the feasible solutions for further power scaling [5] .CBC can be classified into two categories: active phasing [5,6,7,8] and passive phasing [9][10][11][12][13][14][15][16][17][18][19] . Active CBC phasing uses electronic feedback to control the phases of the array elements, which requires complicated phase detection and phase modulation for each element of the array.What's more,the narrow linewidth is essential provided by the seed source [6,7] . Passive CBC relies on self-phase locking via passive coupling mechanisms to combine lasers coherently, which has simple and stable configuration.…”

Section: Introductionmentioning

confidence: 99%

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Passive coherent combination of all-fiber multichannel pulsed laser based on optical feed-back ring cavity

et al. 2013

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Self-organized passive coherent beam combination of multichannel pulsed laser with all-fiber configuration is reported. The phase of multichannel Yb-doped pulsed fiber amplifiers is locked by optical feed-back ring cavity. The traditional disadvantage of energy dissipation to side lode for lower aperture filling is solved via all-fiber laser array with single-aperture configuration. Coherent beam combination of four pulsed fiber amplifiers is experimentally demonstrated. Variable pulsed laser can be obtained by adjusting a AOM,stable combination pulsed fiber laser with excellent temporal and spatial characteristic is achieved. The efficiency of coherent combination is up to 85.0%. This approach presented here provides a feasible technique for power scaling of high-power pulsed fiber laser and maintaining beam quality simultaneously.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Passive coherent combination of all-fiber multichannel pulsed laser based on optical feed-back ring cavity

et al. 2013

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Active Phase Locking of Four Yb-doped Fiber Amplifiers with a Multi-mode Fiber Combiner

Yang

Wang

et al. 2014

International Photonics and OptoElectronics Meetings

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Generation of Bessel-Gaussian vortex beam by combining technology

Yu¹,

Xia²,

Zhang³

et al. 2018

Acta Phys. Sin.

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Bessel beam is an important member of the family of non-diffracting beams and has some unique properties which can be used in many areas, such as micro particle manipulating, material processing and optical communication. However, the source of Bessel beam generated by the existing methods can be used only in a short distance due to its low power. In this paper, according to the coherent combining technology, we propose a method to generate a second-order Bessel-Gaussian (BG) beam by loading discrete vortex phase on specific spatially distributed Gaussian beam array. The coherent combining technology can enhance the output power by increasing the number of beams and use the phase-locking technique to maintain the beam quality. The experimental scheme is described as follows. The expanded Gaussian beam is first split by an amplitude-based spatial light modulator, then the Gaussian beam array is incident on a phase-only spatial light modulator to load the discrete vortex phase, and finally the Gaussian beam array loaded with phase can synthesize BG beam in free space. Due to the diffraction effect of the sub-beams, the optical field distribution between the adjacent sub-beams which are loaded with phase differences, are superimposed. As a result, the optical field distribution of the approximate beam can be obtained by coherent synthesis in free space. After that, the degree of similarity between simulated results and theoretical data is analyzed by correlation coefficient, including the comparison of light intensity between experiment and simulation, and the power-in-the-bucket is used to evaluate beam quality. In addition, the topological charge of the synthesized BG beams is verified by the interference method. By studying the number of beams, the waist radius and the radius of the ring, we find some interesting results which are summarized as follows. Firstly, the closed arrangement of Gaussian beam arrays can improve the quality of the synthesized BG beam. Secondly, the smaller the phase difference between the sub-beams, the more easily the discontinuous piston phase approaches to the vortex phase. Therefore, increasing the number of sub-beams can significantly improve the beam quality of the synthesized BG beam and obtain a higher order synthetic BG beam. Finally, we define the parameter k to represent the tightness of a circular array of Gaussian beams. The present study shows that when the parameter k is close to 1, the best experimental results can be obtained. Therefore, the proposed method has important guidance in generating various vortex beams or enhancing the vortex beam power.

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Research of Coherent Beam Combining Using Actively Phase-Controlling

Cited by 3 publications

References 0 publications

Passive coherent combination of all-fiber multichannel pulsed laser based on optical feed-back ring cavity

Passive coherent combination of all-fiber multichannel pulsed laser based on optical feed-back ring cavity

Active Phase Locking of Four Yb-doped Fiber Amplifiers with a Multi-mode Fiber Combiner

Generation of Bessel-Gaussian vortex beam by combining technology

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