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We investigate the effects of Raman and Kerr gain in crystallinemicroresonators and determine the conditions required to generate modelockedfrequency combs. We show theoretically that strong, narrowband Raman gaindetermines a maximum microresonator size allowable to achieve comb formation.We verify this condition experimentally in diamond and silicon microresonatorsand show that there exists a competition between Raman and Kerr effects thatleads to the existence of two different comb states.

Competition between Raman and Kerr effects in microresonator comb generation