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 (fCEO) linewidth, and the resulting frequency noise spectrum on the fCEO. We find that the laser operating at zero net-cavity dispersion has many advantages, including an approximately 100× reduction in free-running fCEO linewidth and frequency noise power spectral density when compared to the normal-dispersion regime. At the zero-dispersion point, we demonstrate a phase-locked fCEO beat with low residual noise.
© 2011 Optical Society of America
Lasers and Laser Optics
Original Manuscript: February 14, 2011
Revised Manuscript: March 22, 2011
Manuscript Accepted: March 24, 2011
Published: April 22, 2011
Lora Nugent-Glandorf, Todd A. Johnson, Yohei Kobayashi, and Scott A. Diddams, "Impact of dispersion on amplitude and frequency noise in a Yb-fiber laser comb," Opt. Lett. 36, 1578-1580 (2011)