National Institute of Standards and Technology, Time and Frequency Division, Mail Stop 847, 325 Broadway, Boulder, Colorado 80305, USA.
Opt Lett. 2011 May 1;36(9):1578-80. doi: 10.1364/OL.36.001578.
We describe a Yb-fiber-based laser comb, with a focus on the relationship between the net-cavity dispersion and frequency noise on the comb. While tuning the net-cavity dispersion from anomalous to normal, we measure the relative intensity noise, offset frequency (f(CEO)) linewidth, and the resulting frequency noise spectrum on the f(CEO). We find that the laser operating at zero net-cavity dispersion has many advantages, including an approximately 100× reduction in free-running f(CEO) linewidth and frequency noise power spectral density when compared to the normal-dispersion regime. At the zero-dispersion point, we demonstrate a phase-locked f(CEO) beat with low residual noise.
我们描述了一种基于 Yb 光纤的激光梳，重点研究了净腔色散与梳状频率噪声之间的关系。在将净腔色散从反常调至正常的过程中，我们测量了相对强度噪声、偏移频率（f(CEO)）线宽以及 f(CEO)上的频率噪声谱。我们发现，激光在零净腔色散下工作具有许多优点，与正常色散区域相比，自由运行的 f(CEO)线宽和频率噪声功率谱密度降低了约 100 倍。在零色散点，我们演示了具有低残余噪声的锁定 f(CEO)拍频。
