Martinez de Escobar Y Natali, Palacios Álvarez Silvana, Coop Simon, Vanderbruggen Thomas, Kaczmarek Krzysztof T, Mitchell Morgan W
Opt Lett. 2015 Oct 15;40(20):4731-4. doi: 10.1364/OL.40.004731.
We demonstrate a double optical frequency reference (1529 and 1560 nm) for the telecom C-band using 87Rb modulation transfer spectroscopy. The two reference frequencies are defined by the 5S(1/2)F=2→5P(3/2)F'=3 two-level and 5S(1/2)F=2→5P(3/2)F'=3→4D(5/2)F''=4 ladder transitions. We examine the sensitivity of the frequency stabilization to probe power and magnetic field fluctuations, calculate its frequency shift due to residual amplitude modulation, and estimate its shift due to gas collisions. The short-term Allan deviation was estimated from the error signal slope for the two transitions. Our scheme provides a simple and high performing system for references at these important wavelengths. We estimate that an absolute accuracy of ∼1 kHz is realistic.
我们展示了一种利用87Rb调制转移光谱技术实现的用于电信C波段的双光频参考（1529纳米和1560纳米）。这两个参考频率由5S(1/2)F=2→5P(3/2)F'=3两能级跃迁以及5S(1/2)F=2→5P(3/2)F'=3→4D(5/2)F''=4阶梯跃迁定义。我们研究了频率稳定对探测功率和磁场波动的灵敏度，计算了由于残余幅度调制引起的频率偏移，并估计了由于气体碰撞导致的频率偏移。通过两个跃迁的误差信号斜率估计了短期阿伦偏差。我们的方案为这些重要波长的参考提供了一个简单且高性能的系统。我们估计约1千赫兹的绝对精度是现实可行的。
