Abstract
Acousto-optic frequency shift modulators are widely used for well-known heterodyne signal processing algorithms in interferometric sensors. Output signal stability is very important for such modulators applications. For this reason temperature dependences of the polarization mode conversion peak frequency and efficiency of those modulators was tested in a climate chamber. It was shown that the shift of the polarization mode conversion peak frequency was about 0.1 MHz per 1 ℃ temperature change. Such behavior was theoretically explained by the temperature dependence of the difference between the effective refractive indices for polarization modes and the temperature dependence of the surface acoustic wave velocity on the X-cut lithium niobate substrate. Also it was shown that the change in the polarization mode conversion efficiency with temperature was due to a change in the surface acoustic wave excitation efficiency with the frequency, characterized by the frequency dependence of the real part of the interdigital transducer admittance.
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Varlamov, A.V., Agrusov, P.M., Il’ichev, I.V., Lebedev, V.V., Shamrai, A.V., Stepanov, S.I. (2021). Temperature Dependence of Acousto-Optic Polarization Mode Conversion Peak Frequency and Efficiency. In: Velichko, E., Vinnichenko, M., Kapralova, V., Koucheryavy, Y. (eds) International Youth Conference on Electronics, Telecommunications and Information Technologies. Springer Proceedings in Physics, vol 255. Springer, Cham. https://doi.org/10.1007/978-3-030-58868-7_34
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