Hartmann phase pick-up method for detection and correction of piston aberrations in a multi-beam coherent combination system
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- Yang, P., Yang, R., Dong, L. et al. Appl. Phys. B (2010) 98: 465. doi:10.1007/s00340-009-3643-4
In multi-beam coherent combination laser systems, piston aberration between each sub-beam is often regarded as the dominative factor to deteriorate the combination performance. So as to obtain a favorable combination result, a Hartmann phase pick-up method in combination with a seven-element active segmented mirror is presented to pick up and correct the piston aberrations of a seven-beam coherent combination system. A simulative result indicates that the RMS value of the wavefront can be reduced from 401 nm to 3.7 nm, while the far-field Strehl ratio can be increased from 0.22 to 0.99 after correction.