We present a slab laser amplifier beam cleanup experimental system based on a 39-actuator rectangular piezoelectric deformable mirror. Rather than use a wave-front sensor to measure distortions in the wave-front and then apply a conjugation wave-front for compensating them, the system uses a Stochastic Parallel Gradient Descent algorithm to maximize the power contained within a far-field designated bucket. Experimental results demonstrate that at the output power of 335W, more than 30% energy concentrates in the 1x diffraction-limited area while the beam quality is enhanced greatly. (C) 2010 Optical Society of America
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.Natl Univ Deference Technol, Coll Photoelectron Sci & Engn, Changsha 410073, Peoples R China 4.Inst N Opt & Elect, Beijing 100015, Peoples R China
Yang, Ping,Ning, Yu,Lei, Xiang,et al. Enhancement of the beam quality of non-uniform output slab laser amplifier with a 39-actuator rectangular piezoelectric deformable mirror[J]. OPTICS EXPRESS,2010,18(7):7121-7130.