Propagation of partially coherent partially phase-locked laser array in turbulent atmosphere

Zhang, Pu; Wang, Xiaolin; Ma, Yanxing; Ma, Haotong; Xu, Xiaojun; Liu, Zejin

doi:10.1016/j.optcom.2009.10.118

Cited by 7 publications

(6 citation statements)

References 23 publications

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“…Assume that the complex amplitude of the sub beam obeys the Gaussian distribution of fundamental mode normalized, and all the beams distribute in radial. The whole complex amplitude distribution at the exit of an optical emitting antenna is written as: (12) where j denotes the number of sub beams, r denotes the radial distance between the central beam and the others, θ = 360°/(N -1) is the angle between the adjacent fringe beam, ω 0 is the waist of each sub beam, ψ j is the phase of the j-th sub-beam.…”

Section: Distribution Of Laser Beams Array In Near-fieldmentioning

confidence: 99%

“…In order to obtain an output laser with higher power and better beam quality to satisfy the application of directed energy, it is necessary to build laser array and combine to it to form a single focused beam. At present, the main method of beam combination for high-power laser includes incoherent combi-nation [6][7][8][9], coherent combination [10][11][12][13] and spectral combination [14][15][16]. In fact, no matter which method is chosen, when propagating over atmosphere, the far-field beam quality of laser will inevitably be declined due to atmospheric turbulence.…”

Section: Introductionmentioning

confidence: 99%

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Research on the propagation of laser beams arraywith coherent and incoherent combination in dynamic atmosphere turbulence

Deng¹,

Wang²,

Gan³

et al. 2022

Optica Applicata

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High-power laser systems mostly use coherent or incoherent combined beams to achieve higher laser output power to satisfy the application. However, the far-field beam quality of laser will be reduced when propagating over atmosphere. Based on the propagation model of laser beams array, we use atmospheric coherence length, laser duration and average wind velocity to construct dynamic atmospheric turbulence which is characterized as a phase screen sequence. Meanwhile, considered as the indexes to evaluate beam quality, peak intensity and intensity in bucket are comparatively analysed in coherent and incoherent combined beams in far-field. The results indicate that in weaker turbulence circumstances, coherent combined beam has an advantage compared with the incoherent combined beams when laser duration is short, and coherent combination is more suitable for pulsed laser. With laser duration is increasing, the beam quality of incoherent and coherent combined beams both decrease and tend to be close. In stronger turbulence circumstances, the corresponding laser duration will be shorter when the beam quality of coherent combined beams is extraordinary close to that of incoherent combined beams. The researches can provide important data for high-power laser system to select the optimal beam combination mode to improve its performance.

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Section: Distribution Of Laser Beams Array In Near-fieldmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on the propagation of laser beams arraywith coherent and incoherent combination in dynamic atmosphere turbulence

Deng¹,

Wang²,

Gan³

et al. 2022

Optica Applicata

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“…The twist HGCSM beam can be obtained by introducing the twist phase [27]. In practice, the beam array can achieve high power, and can be Photonics 2023, 10, 551 2 of 10 composed of off-axis beams [28,29]. The radial intensity distribution of the beam array can be obtained by radially phase-locked PCBs [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Radially Phased-Locked Hermite–Gaussian Correlated Beam Array and Its Properties in Oceanic Turbulence

et al. 2023

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The descriptions of a radially phased-locked Hermite–Gaussian correlated beam array are introduced, the equation of this beam array in oceanic turbulence is derived, and the intensity profiles of this beam array are shown and analyzed. The results imply that the evolutions of the sub-beam of this beam array in free space are the same as the Hermite–Gaussian correlated beam, while the intensity of this beam array can be adjusted by controlling the initial beam radius R and the coherence length. The intensity profiles of this beam array in free space have multiple spots during propagation, while the same beam array in oceanic turbulence can become a beam spot due to the influences of R and oceanic turbulence. The beam array with smaller coherence length in oceanic turbulence retains the splitting properties better during propagation.

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“…intensity fluctuations) and beam wander [1,2]. A laser beam array is an important choice for a high-power system [3][4][5][6], so propagation properties of laser beam arrays are studied theoretically and experimentally [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. In detail, average spreading and beam quality of linear beam array [7,8], radial beam array [9][10][11][12], rectangular elliptical beam array [13] through turbulent atmosphere are studied, where all the beams of the arrays are arranged at equal intervals.…”

Section: Introductionmentioning

confidence: 99%

Scintillation optimization of linear Gaussian beam array propagating through weak turbulence

Tang¹,

Yuan²,

Wang³

2013

Journal of Modern Optics

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The analytical expression for the scintillation index of the linear Gaussian beam array propagating through weak turbulence in the horizontal path is derived, where the coherent combination is considered. By simulating this expression, the on-axis scintillation index of the linear Gaussian beam array is investigated. The results indicate that the beam number could be optimized to reduce the scintillation index of the uniformly-spaced linear beam array, and the optimum beam number decreases with the separation distance between the adjacent beams increasing. With a given beam array length, the scintillation index of the non-uniformly-spaced linear beam array in the far field can be reduced by symmetrically adjusting the locations of the inner beams.

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Propagation of partially coherent partially phase-locked laser array in turbulent atmosphere

Cited by 7 publications

References 23 publications

Research on the propagation of laser beams arraywith coherent and incoherent combination in dynamic atmosphere turbulence

Research on the propagation of laser beams arraywith coherent and incoherent combination in dynamic atmosphere turbulence

Radially Phased-Locked Hermite–Gaussian Correlated Beam Array and Its Properties in Oceanic Turbulence

Scintillation optimization of linear Gaussian beam array propagating through weak turbulence

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