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Dissipative Kerr-microresonator soliton combs (hereafter called solitoncombs) are promising to realize chip scale integration of full soliton combsystems providing high precision, broad spectral coverage and a coherent linkto the micro/mm/THz domain with diverse applications coming on line all thetime. However, the large soliton comb spacing hampers some applications. Forexample, for spectroscopic applications, there are simply not enough comb linesavailable to sufficiently cover almost any relevant absorption features. Here,we overcome this limitation by scanning the comb mode spacing by employing PDHlocking and a microheater on the microresonator, showing continuous scanning ofthe soliton comb modes across nearly the full FSR of the microresonator withoutlosing soliton operation, while spectral features with a bandwidth of as smallof 5 MHz are resolved. Thus, comb mode scanning allows to cover the whole combmode spectrum of tens of THz bandwidth with only one chip-scale comb.

Continuous scanning of a dissipative Kerr-microresonator soliton comb for broadband, high resolution spectroscopy