Maximizing modulation contrast of KTN electro-optic modulator
Maximizing modulation contrast of KTN electro-optic modulator
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最大化 KTN 电光调制器的调制对比度
DOI：
10.1016/j.optlaseng.2021.106821
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发表时间：
2022-02
影响因子：
4.6
通讯作者：
Hang Chen
中科院分区：
文献类型：
--
作者：
Xiaolei Lv;Jiguang Zhao;Xuping Wang;Xiaoping Du;Bing Liu;Yishuo Song;Hang Chen
KTa 1-xNbxO 3（KTN）电光调制器广泛应用于激光三维成像等领域，优化其调制对比度是提高其调制性能的关键。一般认为，调制器在其透射率为50%时达到最佳调制对比度;然而，介电常数不随电场变化。相反，KTN晶体的介电常数在电场下具有动态响应，这导致优化中的偏差。本文研究了介电常数在低频和高频下对电场的动态响应，提出了基于透射率导数函数的调制对比度最大化方法。在验证实验中，所提出的优化方法被用来实现最大的调制对比度为0.106时，交流电场是320 V/m的频率为1 kHz。偏置电场为95.4 kV/m，是50%透过率点的3.5倍。此外，当交流电场为320 V/m（500 kHz）、偏置电场为87.8 kV/m时，最大调制对比度为0.05，是50%透过率点的两倍。
The KTa1-xNbxO3(KTN) electro-optic modulator (EOM) is extensively applied to laser three-dimensional imaging and other fields, and optimizing its modulation contrast is essential for improving its modulation performance. It is generally considered that the modulator achieves optimal modulation contrast when its transmittance is 50%; however, the dielectric constant does not change with the electric field. Instead, the dielectric constant of a KTN crystal has a dynamic response under an electric field, which causes deviations in optimization. This study investigates the dynamic response of the dielectric constant to an electric field at low and high frequencies, and the maximizing modulation contrast method, which is based on the transmittance derivative function, is proposed. In the verification experiment, the proposed optimization method is used to achieve a maximum modulation contrast of 0.106 when the AC electric field is 320 V/m at a frequency of 1 kHz. The bias electric field is 95.4 kV/m, which is 3.5 times that of the 50% transmittance point. Additionally, when the AC electric field is 320 V/m at 500 kHz and the bias electric field is 87.8 kV/m, a maximum modulation contrast of 0.05 is achieved, which is double that of the 50% transmittance point.
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