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arXiv 1403.7626physics.optics
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纳米开尔文温度测量和温度控制:超越热噪声极限

Nano-Kelvin thermometry and temperature control: beyond the thermal noise limit

Wenle Weng, James D. Anstie, Thomas M. Stace, Geoff Campbell, Fred N. Baynes, Andre N. Luiten

摘要:

我们演示了测温的分辨率为80 $\mathrm{nK} / \sqrt{\mathrm{Hz}}$使用各向同性晶体回音壁模式谐振器的基础上的二向色双模技术。我们同时激发两个模式,其模式频率比非常接近2($\pm0.3$ ppm)。折射率的波长和温度依赖性意味着这些模式之间的频率差是谐振器温度的超灵敏代理。这种温度感测方法自动抑制了对谐振器的热膨胀和振动引起的变化的敏感性。我们还展示了主动抑制的温度波动的谐振腔通过控制驱动激光的强度。剩余的温度波动被示出为低于由谐振器材料的基本热力学波动设置的限制。

英文摘要:

We demonstrate thermometry with a resolution of 80 $\mathrm{nK} / \sqrt{\mathrm{Hz}}$ using an isotropic crystalline whispering-gallery mode resonator based on a dichroic dual-mode technique. We simultaneously excite two modes that have a mode frequency ratio very close to two ($\pm0.3$ppm). The wavelength- and temperature-dependence of the refractive index means that the frequency difference between these modes is an ultra-sensitive proxy of the resonator temperature. This approach to temperature sensing automatically suppresses sensitivity to thermal expansion and vibrationally induced changes of the resonator. We also demonstrate active suppression of temperature fluctuations in the resonator by controlling the intensity of the driving laser. The residual temperature fluctuations are shown to be below the limits set by fundamental thermodynamic fluctuations of the resonator material.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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