Abstract
We report the first demonstration of a microresonator-based tunable mode-locked frequency comb source. We achieve a mode-hop-free tuning range of 16 GHz by simultaneously tuning both the pump laser and the cavity resonance while keeping the system in a multi-soliton mode-locked state. The optical spectrum spans (2.425–3.970 μm) pumping at (2.850 μm) in a silicon microresonator with a comb line spacing of (127 GHz). Our scanning technique can be used to increase the effective resolution of the microresonator-based comb spectroscopy. As a proof-of-principle demonstration, we record the absorption spectrum of the rovibrational transitions of the and bands of acetylene. We measure absorption features as narrow as (6.4 GHz) full width at half-maximum at a frequency sampling step of 80 MHz.
© 2017 Optical Society of America
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