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.
1.Chinese Acad Sci, Key Lab Adapt Opt, Chengdu 610209, Peoples R China 2.Chinese Acad Sci, Inst Opt & Elect, Chengdu 610209, Peoples R China 3.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
Yang, P.,Yang, R.,Dong, L.,et al. Hartmann phase pick-up method for detection and correction of piston aberrations in a multi-beam coherent combination system[J]. APPLIED PHYSICS B-LASERS AND OPTICS,2010,98(2-3):465-469.