一个超低噪音和高收益的伺服控制器,用于超稳定的激光系统
Wen-Chao Ji1,2, Xian-Qing Zhu1,2,3, Yi Hu2,3
1Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China.
The Review of scientific instruments
|May 7, 2025
概括
研究人员通过重新设计反电子来增强超稳定的激光系统. 这项创新实现了前所未有的分频稳定性,为下一代精密应用铺平了道路.
科学领域:
- 物理 物理学 物理
- 计量学 计量学 计量学
- 激光技术 激光技术 激光技术
背景情况:
- 超稳定的激光系统对于精确测量至关重要,目前的最先进系统可以达到10−17左右的分数频率稳定性.
- 将稳定性提升到10−18范围是接近基本热噪声极限的必要条件.
- 压制技术噪声源,特别是电噪声,低于热噪声水平是一个关键的挑战.
研究的目的:
- 通过增强频率稳定反电子来改进超稳定的激光系统.
- 开发一种创新的伺服控制器架构,以实现卓越的噪声抑制.
- 为了在10−18范围内实现分数频率稳定性.
主要方法:
- 重新设计了一个超稳定的激光系统的频率稳定反电子.
- 实现了一种新的伺服控制器,具有16平行运行放大器预放大器阶段.
- 在伺服控制器中使用了一个具有四个级联集成器的高增益阶段.
主要成果:
- 在1Hz时达到1.4nV/√Hz的输入噪声底值.
- 在1Hz时提供230dB的伺服增益.
- 证明了剩余的循环内误差噪声,有助于分数频率稳定性为4.7 × 10-20,这是两个数量级的改进.
结论:
- 重新设计的电子设备代表了超稳定激光器在10−18稳定性方面取得的重大进展.
- 这一进步有效地抑制了电噪声,使得技术噪声挑战的进一步探索成为可能.
- 改进的激光系统对高精度应用具有广泛的吸引力,例如引力波探测器和光学时钟.
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