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研究一种具备校正活塞和倾斜像差能力的自适应锁相光纤激光阵列,利用多相位屏法对其在不同强度湍流大气中的传输性能进行数值计算,引入光束质量因子BPF对湍流大气的影响进行定量分析。当湍流强度较弱(折射率结构常数为C_n~2=1×10~(-15)m~(2/3),传输距离为10 km,相干长度为4.3 cm)时,湍流大气对激光阵列传输的影响较小,光强分布与在真空中传输效果基本一致。当湍流强度较强(折射率结构常数分别为C_n~2=5×10~(-15) m~(-2/3)和1×10~(-14) m~(-2/3),相干长度分别为1.6 cm和1 cm)时,自适应锁相光纤激光阵列的BPF分别为理想情形下的86%和70%;对应的未校正活塞像差和倾斜像差的光纤激光阵列传输至远场处的BPF值分别为理想情形下的55%和38%。计算结果表明,由于校正了活塞和倾斜像差,在较强湍流大气中传输时,自适应锁相光纤激光阵列能够显著提高远场光强的能量集中度。
In this paper, an adaptive phase-locked fiber laser array with the ability to correct the piston and tilt aberration is studied. The multi-phase screen method is used to numerically calculate the transmission performance in a turbulent atmosphere with different intensities. The influence of the beam quality factor BPF on the turbulent atmosphere Quantitative analysis. When the intensity of turbulence is weak (the refractive index structure constant is C_n ~ 2 = 1 × 10 ~ (-15) m ~ (2/3), the transmission distance is 10 km and the coherence length is 4.3 cm) The impact of transmission is small, the light intensity distribution and the vacuum transmission effect is basically the same. When the intensity of turbulence is strong (the refractive index constants are C_n ~ 2 = 5 × 10 ~ (-15) m ~ (-2/3) and 1 × 10 ~ (-14) m ~ (-2/3) The coherence length was 1.6 cm and 1 cm, respectively), the BPF of the adaptive phase-locked fiber laser array was 86% and 70% respectively under ideal conditions; the corresponding uncorrected fiber laser arrays with piston and tilt aberrations were transmitted to BPF values at the far field were 55% and 38% respectively under ideal conditions. The calculated results show that the adaptive phase locked fiber laser array can significantly increase the energy concentration of the far-field light intensity when transmitting in the strong turbulent atmosphere due to the correction of the piston and the tilt aberration.