Innovative Mode-Locked Laser Developed Using Mamyshev Oscillator

Researchers have developed a mode-locked laser that addresses the limitations of existing photonic integrated circuits (PICs) by utilizing erbium-ion-implanted silicon nitride materials. This new laser employs the Mamyshev oscillator architecture, which combines spectral filtering and self-phase modulation to enable effective mode-locking without the need for external seeding.

The laser operates at a frequency of 176 MHz, producing nanojoule pulse energy that is comparable to fiber lasers and significantly surpasses earlier PIC-based sources by two orders of magnitude. Its output is characterized by high coherence and is capable of being compressed to 147 femtoseconds. Notably, it can drive a supercontinuum spanning 1.5 octaves within a silicon nitride waveguide without requiring additional amplification.

A terahertz time-domain spectrometer powered by this laser has demonstrated an impressive bandwidth of 5 THz and a dynamic range of 90 dB. The research highlights the potential applications for this integrated ultrafast laser, ranging from compact frequency metrology to portable spectroscopy systems, including non-contact chemical analysis and inspection.