Numerical simulation of sensorless adaptive phase correction of regular, vertical, and incoherent multimode laser beams
V.A. Bogachev1, S.G. Garanin1,2, F.A. Starikov1,3, R.A. Shnyagin1
1Russian Federal Nuclear Center - All-Russian Research Institute of Experimental Physics, 607190, Sarov, Nizhny Novgorod region, Mira Ave, 37
2National Research Nuclear University MEPhI, 115409, Moscow, Kashirskoe shosse, 31
3Sarov Physical-Technical Institute, 6, Duhov str., Sarov, 607186, Russia
Keywords: адаптивное зеркало, фазовая коррекция лазерного пучка, оптические аберрации, стохастический параллельный градиентный алгоритм, adaptive mirror, phase correction of laser beam, optical aberrations, stochastic parallel gradient algorithm
Abstract
A number of aspects are considered at phase correction of regular and vortical (speckled) laser beams by flexible adaptive mirror, the surface control of which is performed with the help of stochastic parallel gradient (SPG) algorithm, without the use of the wavefront sensor. It is shown that optimal choice of the criterion functional (metric) and basis function set allows one to improve the phase correction accuracy and convergence speed of SPG algorithm. A possibility is demonstrated of partial phase correction of the incoherent multimode radiation that can be realized, for example, in а laser cavity with optically inhomogeneous gain medium.
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