引力波天文台GEO 600象散的热改正
Thermal Correction of Astigmatism in the Gravitational Wave Observatory GEO 600
摘要：
GEO 600的输出端口由不需要的高阶模式（HOM）支配。目前的热致动系统，一个环形加热器后面的折叠镜，导致大量的散光，这产生HOM。我们已经建立并安装了一个散光校正系统，基于加热这个折叠镜的两侧（横向）。通过这些侧面加热器和反射镜后面的环形加热器，可以在水平和垂直自由度上调节其曲率半径。我们使用该系统来匹配GEO 600的两个臂中的反射镜，从而减少对比度缺陷。侧加热器的使用将GEO 600输出端的HOM功率降低了约37%。
英文摘要：
The output port of GEO 600 is dominated by unwanted high order modes (HOMs). The current thermal actuation system, a ring heater behind one of the folding mirrors, causes a significant amount of astigmatism, which produces HOMs. We have built and installed an astigmatism correction system, based on heating this folding mirror at the sides (laterally). With these side heaters and the ring heater behind the mirror, it is possible to tune its radius of curvature in the horizontal and the vertical degree of freedom. We use this system to match the mirrors in the two arms of GEO 600 to each other, thereby reducing the contrast defect. The use of the side heaters reduces the power of the HOMs at the output of GEO 600 by approximately 37%.
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