We demonstrate continuous scanning of a dissipative Kerr micro-resonator soliton comb (hereafter called soliton comb). Detuning between a cw pump laser and a resonance of a microresonator is fixed via Pound-Drever-Hall (PDH) locking during scanning so as to maintain soliton operation. We show continuous comb mode scanning of as large as 190 GHz by heating the microresonator. In addition, with the frequency-scanned soliton comb, we demonstrate broadband, high resolution spectroscopy, showing spectral features with a bandwidth of as small as 5 MHz, while covering more than 2 THz spectrum.
|