Study of the optimum operating mode in lithium niobate acousto-electro-optic modulator
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摘要: 为进一步提高铌酸锂声电光调制器的性能,在确定器件的电光工作模式后,利用相切条件办法对相应的声光工作模式进行了系统的研究。通过以离轴角为自变量分别对x-O-z平面和y-O-z平面内不同超声波情况下的声光优值进行定量计算,确定了铌酸锂声电光器件的最佳工作模式,并给出了该工作模式下中心频率在50MHz~300MHz之间铌酸锂声电光器件的设计参数。计算结果表明,利用最优化工作模式可以获得较大的声光优值,从而有效提高器件的衍射效率。Abstract: In order to improve the performance of lithium niobate acousto-electro-optic(AEO) modulator,the acousto-optic operating modes were systematically studied according to tangent condition after the determination of electro-optic operating mode.Acousto-optic merit for sheared ultrasonic wave in x-O-z plane and y-O-z plane were calculated respectively and the optimum operating mode for lithium niobate AEO modulator was determined.Furthermore,the design parameters for central frequency in range of 50MHz～300MHz were also given.By this optimum operating mode,the AEO device can gain a higher acousto-optic merit and achieve a higher diffractive efficiency.
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Keywords:
- optical devices /
- acousto-optic merit /
- tangent condition /
- lithium niobate
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