【摘要】 本文介绍了LiNbO₃平面光波导声光Bragg衍射实验中,声频率为180MHz的换能器的设计和样品制作工艺,并观测了实验现象。 在射频电功率达到80mW时,一级光斑的衍射效率接近100％,这意味着表面波器件衍射所需的功率此体波器件小一个数量级。实验表明,衍射效率和晶体质量有很大关系。尽管未对提高器件的带宽作出专门设计,声频率在—40→+50MHz范围内变化时,都看见了Bragg衍射现象。更多还原

【Abstract】 The design and prototype technology of a transducer with 180 MHz acoustic frequency are described for the experiment of Acousto-Optical Bragg diffraction in planar LiNbO3 optical waveguide. The experimental phenomena are observed. When the input electric power reaches 80 mW, the diffraction frequency approaches 100%. This means that the diffraction power required by the superficial device is ten times smaller than that of the bulk device. The biffraction efficiency is largely dependent on the crystal quality. Although we did not make special design to enhance the bandwidth of the device, the Bragg diffraction could be observed when the acoustic frequency varies in the range of -40 MHz--h50MHz.更多还原