Sub-kHz-linewidth external-cavity laser (ECL) with Si${}_3$N${}_4$ resonator used as a tunable pump for a Kerr frequency comb

Pascal Maier, Yung Chen, Yilin Xu +11

Combining optical gain in direct-bandgap III-V materials with tunable optical feedback offered by advanced photonic integrated circuits is key to chip-scale external-cavity lasers…