Transducer design of acousto-optic modulators

The acousto-optic modulator (AOMs) have great applications in the fields of laser technology, information processing and micro-processing, which is mainly applied to control and modulate the intensity of light at high frequency. The diffraction efficiency (DE) is the important parameter of AOMs. Researchers have studied many influencing factors of diffraction efficiency. However, few research on internal transducer parameter design in AOMs. In this paper, we propose an electrode optimization scheme to obtain AOMs with high diffraction efficiency. Combining the divergence angle ratio, we experimentally demonstrated the optimal size of the electrode. Furthermore, we model the sound pressure field in COMSOL Multiphysics® software, and analyze the DE of the optimized apodized transducer and the conventional transducer AOMs. The results show that comparing with rectangular transducer, optimized apodized shaped transducer can increase the DE of AOMs by 8.33% on average.