利用多空间模腔读出抑制反射镜涂层热噪声
Mirror Coating Thermal Noise Mitigation Using Multi-Spatial Mode Cavity Readout
摘要：
提出了一种利用多个TEM空间模式读出和稳定激光频率来抑制光学腔中涂层热噪声的方法。最佳权重，我们合成了更广泛的采样的镜面，提高平均布朗热波动。我们显示的热噪声改善因子为1.57，相当于一个标称12米原型腔的MESA光束，和一个因子1.61的改进，在$\textrm{TEM}_{00}$使用三种模式在0.1米的腔的一个实际的实验室实验：相当于冷却镜从室温到120 K。
英文摘要：
We present an approach to mitigate coating thermal noise in optical cavities by using multiple TEM spatial modes to readout and stabilize laser frequency. With optimal weightings we synthesize a wider sampling of the mirror surface, improving averaging of Brownian thermal fluctuation. We show thermal noise improvement factors of 1.57, comparable to a MESA beam of a nominal 12 m prototype cavity, and a factor 1.61 improvement over the $\textrm{TEM}_{00}$ using three modes in a 0.1 m cavity for a practical laboratory experiment: equivalent to cooling mirrors to 120 K from room temperature.
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