Abstract

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 ($f_{\mathrm{CEO}}$) linewidth, and the resulting frequency noise spectrum on the $f_{\mathrm{CEO}}$. We find that the laser operating at zero net-cavity dispersion has many advantages, including an approximately $100\times$ reduction in free-running $f_{\mathrm{CEO}}$ linewidth and frequency noise power spectral density when compared to the normal-dispersion regime. At the zero-dispersion point, we demonstrate a phase-locked $f_{\mathrm{CEO}}$ beat with low residual noise.

© 2011 Optical Society of America

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