Abstract
We demonstrate control and stabilization of an optical frequency comb generated by four-wave mixing in a monolithic microresonator with a mode spacing in the microwave regime (86 GHz). The comb parameters (mode spacing and offset frequency) are controlled via the power and the frequency of the pump laser, which constitutes one of the comb modes. Furthermore, generation of a microwave beat note at the comb's mode spacing frequency is demonstrated, enabling direct stabilization to a microwave frequency standard.
Highlights
We demonstrate control and stabilization of an optical frequency comb generated by four-wave mixing in a monolithic microresonator with a mode spacing in the microwave regime (86 GHz)
Frequency comb generation naturally occurs in modelocked lasers whose emission spectrum constitutes an ‘‘optical frequency ruler’’ and consists of phase coherent modes with frequencies fm fCEO mfrep
This approach is based on continuously pumped fused silica microresonators on a chip, in which frequency combs are generated via parametric frequency conversion through four-wave mixing [10], mediated by the Kerr nonlinearity [11,12,13,14,15]
Summary
We demonstrate control and stabilization of an optical frequency comb generated by four-wave mixing in a monolithic microresonator with a mode spacing in the microwave regime (86 GHz). In contrast to mode-locked lasers, one comb mode can be directly accessed via the frequency of the pump laser (since it is part of the MFC), whereas the mode spacing as a second degree of freedom is controlled by changing the optical path length of the microcavity via the pump power-dependent refractive index change of the microresonator. We show that these combs produce an amplitude modulation, which is sufficient to directly measure a beat note at the mode spacing frequency.
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