铌酸锂光波导中的共振声光耦合和它在表面声波相速测定中的作用

Resonant Acoustooptic Coupling in LiNbO_3 Waveguides and Its Application for Measurement of Phase Velocity of SAW

报道了在质子交换的铌酸锂波导中出现的在静态模转换和动态模转换之间的一种耦合现象，提出了这一现象初步的定性解释，并且应用这一现象来测定表面声波的相速及其色散，获得了与其他测试方法相一致的结果。

A coupling phenomenon between static and dynamic mode conversion in protonexchanged(PE)LiNbO3 waveguides,called as resonant acoustooptic coupling is reported. APreliminary and qualitative explanation of this phenomenon is presented. In addition wehave applied it to the measurements of the phase velocity of surface acoustic wave(SAW).Its variation with acoustical frequency is studied and the results are in accordance with othermeasuring methods.