Collaborative optimization of phase and amplitude of composite signals for acousto-optic beam splitting technology

Abstract

Multi-frequency acousto-optic beam splitting plays a significant role in many laser applications due to its advantages of inertia free, fast refreshing speed and high-precision controllable light intensity and direction. How to reduce the intermodulation distortion and improve the uniformity of the beam splitting intensity has become an intensive issue. This paper proposes the collaborative optimization method to co-optimize of the phase and amplitude of acousto-optic device multi-frequency composite signals, which can eliminate the nonlinear distortion of the amplification of multi-frequency composite signals and increase the energy utilization rate and accuracy of intensity control for each sub-beam. A closed-loop control system for 2D acousto-optic beam splitting is constructed. The uniform array beam splitting with a mean square deviation of less than 0.02 and no spurious points, beam splitting with a controllable intensity distribution, and beam splitting with a controllable beam spacing distribution are realized. And the 2D diffraction efficiency reaches 63.5%. This provides a superior solution for beam splitting applications with an arbitrary number of beam splitting, intensity distribution, and spacing distribution.