Experimental study on coherent beam combination of fiber amplifiers using adaptive power-in-the-bucket cost function

Geng, Chao; Luo, Wen; Tan, Yang; Liu, Hongmei; Mu, Jinbo; Li, Xinyang

doi:10.7498/aps.62.224202

Acta Phys. Sin.

2013

DOI: 10.7498/aps.62.224202

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Experimental study on coherent beam combination of fiber amplifiers using adaptive power-in-the-bucket cost function

Chao Geng¹,

Wen Luo²,

Yang Tan³

et al.

Abstract: Beam combination (BC) of fiber amplifiers based on master-oscillator-power-amplifier configuration is an outstanding way to generate high power and high beam quality laser output, where the tip/tilt aberrations among beamlets are considered as a serious influence factor to BC effects. In this paper, a new tip/tilt control method based on adaptive power-in-the-bucket (PIB) cost function is proposed to solve the problem of restricted tip/tilt correcting value in current BC systems. Experimental setup of coherent… Show more

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Cited by 4 publications

References 19 publications

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View-flipping effect reduction and reconstruction visualization enhancement for EPISM based holographic stereogram with optimized hogel size

Yan¹,

Zhang²,

Wang³

et al. 2020

Sci Rep

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To reduce the view-flipping effect and enhance the viewing resolution, the modulation characteristics of the hogel based holographic stereogram is constructed and validated. The performance of the view-flipping effect is analyzed, and the results indicate that decreasing the size of hogel is beneficial to the reduction of the view flipping, however, which will result in significant diffraction effect which can degrade the reconstruction quality. Furthermore, a diffraction-limited imaging model of the hogel based holographic stereogram is established, where both the limited aperture of the hogel and the defocused aberration of the object point are introduced, and the effective resolvable size of the reconstructed image point is simulated. The theory shows that there is an optimal hogel size existed for the certain depth of scene. Both the numerical and optical experiments are implemented, and the results are well agreed with the theoretical prediction, which demonstrates that the view-flipping reduction and reconstruction visualization enhancement for EPISM based holographic stereogram can be achieved when the proper size of hogel is utilized.

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View-flipping effect reduction and reconstruction visualization enhancement for EPISM based holographic stereogram with optimized hogel size

Yan¹,

Zhang²,

Wang³

et al. 2020

Sci Rep

View full text Add to dashboard Cite

show abstract

Adaptive fiber optics collimator based on flexible hinges

Zhi

et al. 2014

Appl. Opt.

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In this manuscript, we present a new design for an adaptive fiber optics collimator (AFOC) based on flexible hinges by using piezoelectric stacks actuators for X-Y displacement. Different from traditional AFOC, the new structure is based on flexible hinges to drive the fiber end cap instead of naked fiber. We fabricated a real AFOC based on flexible hinges, and the end cap's deviation and resonance frequency of the device were measured. Experimental results show that this new AFOC can provide fast control of tip-tilt deviation of the laser beam emitting from the end cap. As a result, the fiber end cap can support much higher power than naked fiber, which makes the new structure ideal for tip-tilt controlling in a high-power fiber laser system.

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Experimental research of boresight error correction using returning signals from the illuminated targets through atmosphere

Tan¹,

Geng²,

Li³

et al. 2015

Acta Phys. Sin.

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The relationship between boresight error and returning signal from the illuminated target is studied theoretically. The operating principle of a new-style adaptive-optics device, which is named adaptive fiber-optics collimator with the abilities to correct both laser beam transmission error and pointing error, is introduced. The laser beam pointing experimental setup with a laser propagation distance of 200 m through horizontal atmosphere is established. Based on returning signals from the illuminated two-dimensional and three-dimensional targets, the beam pointing closed loop using stochastic parallel gradient descent algorithm (SPGD) algorithm is achieved under different initial boresight errors. The experimental results indicate that the evaluation parameters of the residual boresight errors are less than 6% and 10.8% for the two-dimensional target and three-dimensional target, respectively, which are within the tolerance of theoretical analysis. Finally, the influence of SPGD parameter on moving-target pointing is analyzed.

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Experimental study on coherent beam combination of fiber amplifiers using adaptive power-in-the-bucket cost function

Cited by 4 publications

References 19 publications

View-flipping effect reduction and reconstruction visualization enhancement for EPISM based holographic stereogram with optimized hogel size

View-flipping effect reduction and reconstruction visualization enhancement for EPISM based holographic stereogram with optimized hogel size

Adaptive fiber optics collimator based on flexible hinges

Experimental research of boresight error correction using returning signals from the illuminated targets through atmosphere

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