具有亚赫兹线宽的自锁超稳定laser
An auto-locking ultra-stable laser with sub-hertz linewidth
摘要：
本文首次详细报道了亚赫兹线宽自锁超稳激光器的设计过程和性能。利用自制的控制器，采用数字电路和模拟电路相结合的方法，将激光频率自动稳定到光学参考腔。数字电路用于超稳激光器状态的诊断和操纵，模拟电路用于判别信号的解调和伺服控制。为了缩短自锁超稳激光器的锁定时间，提高自锁超稳激光器的可靠性，提出了一种在闭环状态下而不是开环状态下搜索传输信号的方法。157次再锁定后得到的中位时间为16.6s，小于20 s的概率大于86%。在0.1 ~ 100 s的积分时间范围内，分数阶频率不稳定度小于3.4E-15。该系统的性能表明，它将作为光时钟信号传输的一个重要子系统。
英文摘要：
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.
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