本文报导在Ti扩散LiNbO_3波导中,由光学导波和声表面波实现的声光衍射实验。实验中,我们测量了两种TE(TE_0,TE_1)模的主要衍射级光强相对声功率的分布,同时给出实用的计算声功率公式:Pa=(4△n~2/n~6P_(3J)~2K)/LP_R。并在声光品质因数Q=2.5条件下,近似选取了Raman-Nath衍射0级光束相消的位相条件,进行了参数处理。计算了声功率、位移和应变。利用光学导波和声表面波衍射作用的集成光学声光器件,可用于光调制,偏转和开关。过去,这方面有代表性的研究工作是Kuhn等人在玻璃膜波导上的声光工作和Schmidt等人在LiNbO_3(LN)扩散波导上的声光工作。

The acousto-optic diffraction experimental results of guided optical waves and acoustic surface waves in the Ti-diffusod LiNbQ3 waveguides are reported in this paper. Phe intensity of two TE modes (TE0, TEX) varying with the acoustic power is measured. For the zero-order beam, modulation approximate to 100% is obtained at 68 mW acoustic power. After simple deduction, acoustic surface displacement is obtained.