Phase and amplitude beam shaping with intelligent input plane and Fourier plane phase modifications

We find that ideas in optical image encryption can be very useful for adaptive optics in achieving simultaneous phase and amplitude shaping of a laser beam. An adaptive optics system with simultaneous phase and amplitude shaping ability is very desirable for atmospheric turbulence compensation. Atmospheric turbulence induced beam distortions can jeopardize the effectiveness of optical power delivery for directed energy systems and optical information delivery for free space optical communication systems. In this manuscript, a prototype adaptive optics system is proposed based on a famous image encryption structure. The major change is to replace the two random phase plates at the input plane and Fourier plane of the encryption system, respectively, with two deformable mirrors that perform on-demand phase modulations. A Gaussian beam is used as an input to replace the conventional image input. We show through theory, simulation and experiments that the slightly modified image encryption system can be used to achieve arbitrary phase and amplitude beam shaping within the stroke limits of the deformable mirrors. In application, the proposed technique can be used to perform mode conversion between optical beams, generate structured light signals for imaging and scanning, and compensate atmospheric turbulence induced phase and amplitude beam distortions.