Hybrid-integrated dark-pulse microcombs towards visible light spectrum

TL;DR

This paper demonstrates the generation of dark-pulse microcombs at 780 nm using hybrid integrated silicon nitride microresonators driven by high-power lasers, enabling compact spectroscopic and sensing applications.

Contribution

It introduces a novel hybrid integration approach for dark-pulse microcombs at visible wavelengths, advancing compact and efficient frequency comb sources.

Findings

Dark-pulse formation at 780 nm achieved

Repetition rates down to 20 GHz demonstrated

Potential for atom-chip spectroscopy and sensing

Abstract

Leveraging hybrid integration, we demonstrate dark-pulse formation at 780-nm wavelength band in integrated Si$_3$N$_4$ microresonators driven by high-power AlGaAs-based chip-scale lasers. The device outputs coherent frequency combs with electronically detectable repetition rates down to 20 GHz, paving a route to efficient and compact atom-chip interfaces for spectroscopy, metrology and sensing.