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基于低温共振器的光学频率参考

Eugen Wiens, Chang Jian Kwong, Timo Müller

|December 13, 2023

概括

我们开发了一个低温光学参考激光器,用于精确的频率测量. 该系统实现了高稳定性,显示了高级计时应用的潜力.

科学领域:

物理物理学物理
计量学计量学计量学
光学工程是指光学工程.

背景情况:

光学原子钟需要高度稳定的激光源.
光学共振器的低温运行可以减少热噪声并提高稳定性.
振动和温度波动是实现高性能光学引用的关键挑战.

研究的目的:

开发和描述一个稳定到冷光学共振器的1.5微米激光器.
为了研究低温光学参考的频率不稳定性和漂移.
确定当前系统中的噪音来源和局限性.

主要方法:

稳定一个1.5微米激光器到一个光学共振器.
响应器在1.7K的闭环冷静电机内运行,并具有被动振动隔离.
频率不稳定性测量在各种整合时间 (1秒到6000秒).

主要成果:

在1秒的集成时间实现了2 × 10−14的频率不稳定性,受到残余振动的限制.
证明频率不稳定性为6.2 × 10−15在100秒和3.5 × 10−16在6000秒.
在190天的时间里,测量了 -3.7 × 10−20/s的平均分数频率漂移率.

结论:

低温光学参考显示了高精度光学频率传播的有希望的性能.
其余振动和实验室温度变化显著影响短期到中期稳定性.
进一步减轻环境因素可能使得响应器的热噪声性能达到限制.

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