Chip-scale Mamyshev oscillator delivers nanojoule ultrafast pulses on silicon nitride
Researchers demonstrate a photonic integrated, erbium-ion-implanted Mamyshev oscillator on silicon nitride that produces a 176‑MHz train of nanojoule pulses without external seeding, which can be linearly compressed to 147 fs and directly generate a 1.5‑octave supercontinuum in a Si3N4 waveguide; the same source enables THz time-domain spectroscopy with 5 THz bandwidth and 90‑dB dynamic range, underscoring potential for chip-scale metrology and portable spectroscopy.