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Carrier-envelope offset frequency linewidth narrowing in a Cr:forsterite laser-based frequency comb

Abstract

Cr:forsterite laser-based frequency combs are useful for spectroscopic purposes in the near-IR wavelength region. However, self-referenced Cr:forsterite combs tend to exhibit wide carrier-envelope offset frequency (f0) linewidths, which result in broad comb teeth. This can be attributed to significant frequency noise across the comb’s spectral bandwidth. We have stabilized a prism-based Cr:forsterite laser comb and observed narrowing of the f0 linewidth from 1.4MHz down to 100kHz by changing only the prism insertion, and to 23 kHz by inserting a knife edge into the intracavity beam while keeping the same prism insertion. The noise dynamics of the Cr:forsterite laser frequency comb are investigated with the goal of explaining this f0 narrowing phenomenon.

© 2016 Optical Society of America

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