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Contribution to the electromechanical and nonlinear properties of GaPO4 crystals

机译：对GaPO4晶体的机电和非线性特性的贡献

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摘要

In the last decade, much attention has been given to piezoelectric crystals with large electromechanical coupling coefficient. The quartz homeotypes berlinite and gallium orthophosphate (GaPO4), along with the calcium gallo-germanates such as langasite are representative of these crystals. The coupling coefficient k26 associated with thickness-shear mode resonators is two times greater than that of quartz, increasing the spacing between the series and parallel resonance frequencies of resonators suitable for the frequency range from 1 to 100 MHz. This is important for some types of crystal oscillators and monolithic filters. The large electromechanical coupling coefficient also increases the difference between the temperature dependencies of the fundamental resonance frequency and its harmonics. In this paper, measured resonance frequency-temperature characteristics of the fundamental and third harmonics of selected rotated Y-cut GaPO4 resonators vibrating in the thickness-shear mode are presented. Further attention is given to the measurement of some nonlinear properties of rotated Y-cut GaPO4 resonators. Knowledge of such nonlinear interactions is important for the analysis of intermodulation phenomena in resonators, and for the application of GaPO4 resonators in crystal oscillators, filters and other electronic devices.
机译：在过去的十年中，已经对具有大的机电耦合系数的压电晶体给予了极大的关注。石英同型型别石和正磷酸镓（GaPO4），以及高锗酸钙（如硅酸钙）是这些晶体的代表。与厚度剪切模式谐振器相关的耦合系数k26是石英的两倍，从而增加了适用于1至100 MHz频率范围的谐振器的串联和并联谐振频率之间的间隔。这对于某些类型的晶体振荡器和单片滤波器很重要。较大的机电耦合系数还会增大基本共振频率与其谐波之间的温度依赖性之间的差异。本文介绍了在厚度剪切模式下振动的选定旋转Y形GaPO4谐振器的基频和三次谐波的实测谐振频率-温度特性。进一步关注旋转Y形切割GaPO4谐振器的某些非线性特性的测量。此类非线性相互作用的知识对于分析谐振器中的互调现象以及将GaPO4谐振器应用于晶体振荡器，滤波器和其他电子设备非常重要。

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