The Impact of Dispersion on Amplitude and Frequency Noise in a Yb-fiber Laser Comb
Abstract
We describe a Yb-fiber based laser comb, with a focus on the relationship between net-cavity dispersion and the frequency noise on the comb. While tuning the net cavity dispersion from anomalous to normal, we measure the amplitude noise (RIN), offset frequency (fCEO) linewidth, and the resulting frequency noise spectrum on fCEO. We find that the laser operating at zero net-cavity dispersion has many advantages, including an approximately 100x reduction in free-running fCEO linewidth and frequency noise power spectral density between laser operation at normal and zero dispersion. In this latter regime, we demonstrate a phase-locked fCEO beat with low residual noise.
0