Hertz-linewidth, high-power, frequency-agile photonic integrated E-DBR laser. - Anat Siddharth; Alaina Attanasio; Grigory Lihachev; Rui Ning Wang; Zheru Qiu; Scott Kenning; Sunil A. Bhave; Johann Riemensberger; Tobias J. Kippenberg (OFC, 2024)