论文标题
简化的低温光谐振器设备可提供超低频率漂移
A simplified cryogenic optical resonator apparatus providing ultra-low frequency drift
论文作者
论文摘要
提出了提供与氢mas氢相当的光频率的系统。它由$ 5 $ \ $ \ mathrm {cm} $ long，垂直取向的硅光学谐振器，在温度下以$ 1.5 $ $ \ $ \ mathrm {k} $和$ 3.6 $ $ \ $ \ mathrm {k Mathrm {k Mathrm {k Mathrm {k} $，在一个封闭的cryostat中，具有低 - 型cyerostat，具有低 - 效果级别的joure-joule-joule-thomson。我们表明，使用标准低温恒温器，简单的低温光学机械设置，没有主动或被动振动隔离，最小频率不稳定为$ 2.5 \ times10^{ - 15} $ at $τ= 1500 $ $ $ $ $ $ $ $ $ $ $ $ $ \ mathrm {s} $集成时间。通过使用设计用于低加速度灵敏度的谐振器，可以最大程度地减少脉冲管振动的影响。随着降低的光学激光功率和询问责任周期，达到了$ -2.6 \ times10^{ - 19} $/$ \ mathrm {s} $的超低分数漂移。以$ 3.5 $ $ \ $ \ mathrm {k} $谐振频率表现出消失的热灵敏度和超高温度导数$ 8.5 \ times10^{ - 12}/\ mathrm {k}^{2} $。这些是有利的特性，在不配备Joule-Thomson阶段的更简单的低温恒温器中也应导致高性能。
A system providing an optical frequency with an instability comparable to that of a hydrogen maser is presented. It consists of a $5$ $\mathrm{cm}$ long, vertically oriented silicon optical resonator operated at temperatures between $1.5$ $\mathrm{K}$ and $3.6$ $\mathrm{K}$ in a closed-cycle cryostat with low-temperature Joule-Thomson stage. We show that with a standard cryostat, a simple cryogenic optomechanical setup, no active or passive vibration isolation, a minimum frequency instability of $2.5\times10^{-15}$ at $τ=1500$ $\mathrm{s}$ integration time can be reached. The influence of pulse-tube vibrations was minimized by using a resonator designed for low acceleration sensitivity. With reduced optical laser power and interrogation duty cycle an ultra-low fractional frequency drift of $-2.6\times10^{-19}$/$\mathrm{s}$ is reached. At $3.5$ $\mathrm{K}$ the resonator frequency exhibits a vanishing thermal sensitivity and an ultra-small temperature derivative $8.5\times10^{-12}/\mathrm{K}^{2}$. These are favorable properties that should lead to high performance also in simpler cryostats not equipped with a Joule-Thomson stage.
