A new method of wavefront sensing based on fiber coupling in the fiber laser array has been proposed. The scheme and the recovery process of this sensor are introduced. Numerical simulations of detecting the turbulence-induced aberrations utilizing such method and experiments of recovering static aberrations with 7-element adaptive fiber optics collimator (AFOC) array are presented. Numerical results show that such sensor could effectively recover the wavefront with turbulence-induced aberrations. For hexagonal array with different units, the optimum reconstructed Zernike mode is also different. Smaller array filled factor leads to larger recovery residual error. Compared with array filled factor of 1.0, value of 0.8 is easy to obtain and brings in recovery residual error increment less than 10%. Experimental results reveal that RMS less than 0.075 μm of the recovery residual error is obtained when detecting the static aberration with 7-element AFOC array with filled factor of 0.875. The aberration is with RMS of 0.433 μm and mainly includes Zernike modes of low orders like defocus. Results here validate the effectiveness of the wavefront sensing method proposed here. Such method would get further application in systems like laser array propagating and turbulence aberrations correcting.
Wavefront sensing based on fiber coupling of the fiber laser array
First published at:Apr 01, 2018
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Supported by the Innovation Foundation of Chinese Academy of Sciences under Grant (CXJJ-15S096) and National Natural Science Foundation of China under Grant (61675205)
Get Citation: Li Feng, Geng Chao, Huang Guan, et al. Wavefront sensing based on fiber coupling of the fiber laser array[J]. Opto-Electronic Engineering, 2018, 45(4): 170691.