Passively mode locked Raman laser
W. Liang, V. S. Ilchenko, A. A. Savchenkov, A. B. Matsko, D. Seidel,, and L. Maleki
TL;DR
This paper reports the discovery of a passively mode-locked Raman laser generating a novel optical comb in a crystalline whispering gallery mode resonator, confirmed by radio-frequency beat note measurements, distinct from Kerr combs.
Contribution
It introduces a new type of passively mode-locked Raman laser in crystalline resonators, expanding the understanding of optical comb generation mechanisms.
Findings
Successful observation of a Raman comb in a whispering gallery mode resonator.
Confirmation of mode locking via radio-frequency beat note measurement.
Distinct from Kerr combs and hyper-parametric oscillation phenomena.
Abstract
We report on the observation of a novel mode locked optical comb generated at the Raman offset (Raman comb) in an optically pumped crystalline whispering gallery mode resonator. Mode locking is confirmed via measurement of the radio-frequency beat note produced by the optical comb on a fast photodiode. Neither the conventional Kerr comb nor hyper-parametric oscillation is observed when the Raman comb is present.
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