用双模脉塞振荡测量低温蓝宝石频标的基本热噪声极限
Measurement of fundamental thermal noise limit in a cryogenic sapphire frequency standard using bimodal maser oscillations
摘要：
我们报告的观察Schawlow-Townes噪声限制在低温蓝宝石二级频率标准。这种效应对频率稳定性造成了根本的限制，并通过$12.04 GHz$回音壁双峰脉泽振荡的新激发进行了测量。在振荡之间的$10 kHz$的拍频使得灵敏的探针能够仅用0.5 $pW$的输出功率来测量$10^{-14}τ^{-1/2}$的分数频率不稳定性。
英文摘要：
We report observations of the Schawlow-Townes noise limit in a cryogenic sapphire secondary frequency standard. The effect causes a fundamental limit to the frequency stability, and was measured through the novel excitation of a bimodal maser oscillation of a Whispering Gallery doublet at $12.04 GHz$. The beat frequency of $10 kHz$ between the oscillations enabled a sensitive probe for this measurement of fractional frequency instability of $10^{-14}τ^{-1/2}$ with only 0.5 $pW$ of output power.
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