We present a terahertz-carrier frequency comb based on Kerr-Induced Synchronization (KIS) of an Optical Frequency Comb (OFC), wherein a commercially available C-band laser harnesses an OFC tooth and captures the repetition rate (frep) of the OFC. The linear relationship between the C-band laser modulation and the OFC frep modulation enables direct transfer of the C-band laser frequency to the OFC frep. In addition, the large KIS effect bandwidth facilitates frep tuning over a wide range of frequencies. This work addresses the THz gap by providing a direct path for millimeter wave generation, utilizing CMOS-compatible fabrication techniques and off-the-shelf components.
We show that in the Kerr-Induced Synchronization (KIS) regime, an external reference pump laser allows for the control of the opposite (in frequency) Dispersive Wave (DW) power and frequency, through self-balancing of the cavity soliton. We report an increase of more than 20~dB of the DW of an octave-spanning comb at 780 nm, with a reference pump in the telecom C-band, while tuning of the DW over three comb teeth. Our work paves the way for significant improvement of the carrier-envelope offset frequency detection of octave-spanning combs.
We demonstrate that a dissipative Kerr soliton comb tooth can be captured by another injected pump laser, resulting in Kerr induced synchronization. This regime is highly significant for metrology applications, where the soliton can passively lock onto a reference clock laser. The dynamics of the system also enable other forms of locking, where the comb tooth is captured at a fixed offset from the reference laser, entering the syntonization regime. Similar to breather entrainment, we establish that the syntonization frequency offset correlates with the soliton's repetition rate.
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