Thermal noise in optical cavities revisited
Thermal noise in optical cavities revisited
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DOI：
10.1364/josab.29.000178
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发表时间：
2012-01-01
影响因子：
1.9
通讯作者：
Sterr, Uwe
中科院分区：
文献类型：
--
作者：
Kessler, Thomas;Legero, Thomas;Sterr, Uwe
光学参考腔的热噪声对超稳定激光器的频率不稳定性设置了根本限制。使用 Levin 的涨落耗散定理公式，我们修正了 Numata 等人给出的间隔基贡献的分析估计。 [物理。莱特牧师。 93, 250602 (2004)]。为了进行详细分析，我们对热噪声进行了有限元计算，重点关注垫片几何形状、支撑结构和不同材料的使用。我们发现，垫片和反射镜之间接触区域附近的耗散增加会显着增加热噪声。根据对支撑结构贡献的估计，我们给出了腔体低噪声安装的指南。对于混合材料腔体，我们表明可以在不恶化热噪声的情况下补偿热膨胀。 (C) 2011 美国光学学会
Thermal noise of optical reference cavities sets a fundamental limit to the frequency instability of ultrastable lasers. Using Levin's formulation of the fluctuation-dissipation theorem, we correct the analytical estimate for the spacer contribution given by Numata et al. [Phys. Rev. Lett. 93, 250602 (2004)]. For detailed analysis, finite-element calculations of the thermal noise focusing on the spacer geometry, support structure, and the usage of different materials have been carried out. We find that the increased dissipation close to the contact area between spacer and mirrors can contribute significantly to the thermal noise. From an estimate of the support structure contribution, we give guidelines for a low-noise mounting of the cavity. For mixed-material cavities, we show that the thermal expansion can be compensated without deteriorating the thermal noise. (C) 2011 Optical Society of America