Sen Zhang, Junwei Zhang, Jie Mu, Yi Zhou, Xiao Wang, Jingqin Su, Dongxia Hu. Dynamical Phase Error Control and Bandwidth Analysis for Coherent Beam Combination Based on Stochastic Parallel Gradient Descent Algorithm[J]. Acta Optica Sinica, 2018, 38(5): 0514003
- Acta Optica Sinica
- Vol. 38, Issue 5, 0514003 (2018)
Fig. 1. Schematic of laser beam array
Fig. 2. Schematic for coherent beam combination of high-energy short-pulse laser based on SPGD algorithm
Fig. 3. Convergence curves for different performance evaluation functions
Fig. 4. Comparison of adaptive gain and constant gain. (a) Algorithm convergence curves; (b) adaptive gain variation curve
Fig. 5. Schematic of coherent beam combination for two short laser pulses
Fig. 6. Variation curves of peak intensity of far-field focal spot for open-loop and closed-loop states
Fig. 7. Coherent beam combination with external vibration conditions. (a) 10 Hz; (b) 15 Hz; (c) 20 Hz; (d) 25 Hz
Fig. 8. Convergence curves for static phase error correction in different laser arrays by SPGD algorithm
Fig. 9. Convergence curves for dynamic phase error correction in four-beam and nine-beam laser arrays by SPGD algorithm for 1 s. (a) δ=0.2; (b) δ=0.4; (c) δ=0.8
Fig. 10. Relationship between coherent combining effect and dynamic phase noise performance under different algorithm iteration rates. (a) Iteration rate is 2 kHz; (b) iteration rate is 5 kHz
Fig. 11. Relationship between coherent combining effect and dynamic phase noise for two beams and nine beams. (a) Two beams; (b) nine beams
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Table 1. Relationship between control bandwidth and iteration rate for SPGD algorithm
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