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测量了在不同实验设置下光折变掺铜钾钠铌酸锶钡晶体(Cu:KNSBN)中双波耦合的能量耦合系数ξ,并从耦合光波强度随时间变化的实验数据中计算了双波耦合信号光的信噪比(SNR)。对比双波耦合能量系数ξ和信号光的信噪比(SNR),结果表明与理论预计的一样,随着信噪比的提高双波耦合能量系数ξ增大。这是因为设计的实验条件大大地降低了晶体内反射光对立体折射率光栅的影响。
The energy coupling coefficient ξ of the two-wave coupling in Cu-KNSBN doped with Cu and KNSBN was measured under different experimental setups. The experimental data of the coupled wave intensities with time were calculated. Signal-to-noise ratio (SNR) of the coupled signal light. The results show that the energy coefficient ξ of the two-wave coupling increases with the increase of the signal-to-noise ratio. This is because the experimental conditions of the design greatly reduce the influence of the intra-crystal reflected light on the three-dimensional refractive index grating.