Real-time 1.5 kHz adaptive optical to correct for atmospheric turbulence.

Experiments and numerical simulations of the phase correction of laser beam turbulent distortions have been carried out by using the adaptive optical system with the bandwidth of 1500 Hz. Adaptive system included Shack-Hartmann wavefront sensor based on fast 4 kHz CMOS camera with the lenslet spatial resolution 20x20 lenslets, high-resolution bimorph deformable mirror with first resonance frequency of 7 kHz and FPGA-based controller to elaborate signals to correct for the input phase fluctuations. It has been shown that the bandwidth of adaptive optical system should be an order of magnitude greater than the bandwidth of the turbulent distortions for the effective correction.