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法布里珀罗腔被用作高稳定光频振荡器的频率参考。腔长的稳定性会受到由于振动导致的腔体形变的破坏,进而使激光器产生频率噪声。通常采用有限元分析来考察光腔在任意加速度下的弹性形变。推导出了由腔镜的位移和倾斜带来的腔长变化的通用表达式,表达式明确地给出了光腔形变和其导致的振动敏感度之间的关系。根据该方法,分析了一种水平光学腔的振动敏感度,并且通过优化支撑结构降低了光学腔对振动的敏感性。此外,设计了一种小型振动平台,可以在三个相互垂直的方向对腔体施加振动。
The Fabry-Perot cavity is used as the frequency reference for high-stability optical frequency oscillators. The stability of the cavity length is affected by the deformation of the cavity due to vibration, which in turn causes the laser to generate frequency noise. Finite element analysis is usually used to investigate the elastic deformation of the optical cavity at any acceleration. The general expression of the change of cavity length caused by the displacement and tilt of the cavity mirror is deduced. The expression clearly shows the relationship between the cavity deformation and the vibration sensitivity. According to this method, the vibration sensitivity of a horizontal optical cavity is analyzed and the optical cavity’s sensitivity to vibration is reduced by optimizing the support structure. In addition, a small vibration platform was designed that vibrates the chamber in three mutually perpendicular directions.