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一个数字伺服器用于超稳定的激光频率稳定.

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概括

我们开发了一个全数字伺服系统,用于超稳定的激光频率稳定. 该系统在1秒内达到10-16的分数频率稳定性,对于先进的光学时钟实验至关重要.

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科学领域:

  • 物理 物理学 物理
  • 计量学 计量学是一门学科.
  • 光学工程是指光学工程.

背景情况:

  • 超稳定的激光频率对于光学钟等先进实验至关重要.
  • 现有的伺服系统在满足高带宽,精度和低噪音需求方面面临挑战.

研究的目的:

  • 为了呈现一个完全数字的伺服系统,优化了超稳定的激光频率稳定.
  • 为了满足光学时钟实验的严格要求.

主要方法:

  • 采用了磅-德雷弗-霍尔方法,具有超稳定的空腔,用于产生错误信号.
  • 实现了双通道伺服输入:高带宽和高低频收益.
  • 使用现场可编程网关阵列 (FPGA) 实现系统的数字化,配有自定义无限冲动响应 (IIR) 过器和比例积分导数 (PID) 算法.

主要成果:

  • 实现了120.5 ns的低延迟和3.22 × 10−12 V2/Hz@1 Hz的低输入噪声.
  • 成功锁定了一个外部腔体二极管激光器到一个超低膨胀超稳定的腔体.
  • 获得了10−16@1s的分数频率稳定性.

结论:

  • 全数字伺服系统可实现光学时钟实验所需的高激光频率稳定性.
  • 伺服器的电噪声贡献是最小的 (5.54 × 10−18@1s).
  • 这种数字伺服器为精确的激光频率控制提供了强大的解决方案.