论文标题
具有子赫兹线宽的自动锁定超稳激光器
An auto-locking ultra-stable laser with sub-hertz linewidth
论文作者
论文摘要
我们首次详细报告了具有子赫兹线宽的自动锁定超稳定激光器的设计过程和性能。用自制控制器自动将激光频率自动稳定至光学参考腔，该控制器基于数字电路和模拟电路的组合。数字电路用于诊断和操纵超稳定激光器的状态，模拟电路用于解调区分信号和伺服控制。提出了一种在闭环状态而不是开环状态下搜索传输信号的方法，以减少锁定时间并改善自动锁定超稳定激光器的可靠性。重新锁定157次后，获得16.6s的中位时间，少于20 s的概率超过86％。获得1.08 Hz的中间线宽，在0.1至100 s之间的整合时间时，分数频率不稳定性小于3.4e-15。该系统的性能证明了这将被用作传输光学时钟信号的重要子系统。
We report in detail the design process and performance of an auto-locking ultra-stable laser with sub-hertz linewidth at the first time. The laser frequency is automatically stabilized to an optical reference cavity with a home-made controller, which is based on a combination of digital circuit and analog circuit. The digital circuit is used for diagnosing and manipulating the state of the ultra-stable laser, and the analog circuit is used for demodulating the discriminate signal and servo control. A method of searching the transmission signal in the closed-loop state instead of the open-loop state is proposed to reduce the locking time and improve the reliable of the auto-locking ultra-stable laser. The median time of 16.6s is obtained after 157 times of relocking, and the probability of less than 20 s is more than 86%. The median linewidth of 1.08 Hz is obtained, and the fractional frequency instability is less than 3.4E-15 at integration time between 0.1 and 100 s. The performance of this system demonstrates that will be used as an important subsystem to transfer the optical clock signal.
