论文标题
通过光学反馈证明参数不稳定性抑制
Demonstration of Parametric Instability suppression through optical feedback
论文作者
论文摘要
我们在电流反馈回路中使用光学驱动来证明参数不稳定性抑制了参数不稳定性，在80米长的Fabry-Perot腔中稳定了高阶光学模式含量。高阶模式的循环抑制是通过注入相同频率和相反相的高阶模式来实现的。频率匹配是通过测量腔传输的基本和高阶模式之间的节拍音符信号，并将该信号应用于电流调节器以创建所需频率侧带的。通过固有模式与输入输入梁和腔的高阶模式之间的固有模式重叠，将边带与高阶模式的空间模式匹配。本文介绍了参数抑制的理论分析和实验证明，因为不稳定性通常会以大约2.5的参数增益响起。
We demonstrate the suppression of parametric instability using through optical actuation in an electro-optical feedback loop, stabilising the high order optical mode content in an 80 metre long Fabry-Perot cavity. The loop suppression of the high order mode is achieved by injecting a high order mode with the same frequency and opposite phase. Frequency matching is achieved by measuring the beat note signal between the fundamental and high order mode in transmission of the cavity and applying that signal to an electro-optical modulator to create the required frequency sideband. Spatial mode matching of the sideband to the high order mode is accomplished through the inherent mode overlap between the input injected beam and the high order mode of the cavity. The paper presents the theoretical analysis and experimental demonstration of parametric instability suppression, for an instability which would normally ring up with a parametric gain of approximately 2.5.
