Sub-Hz fundamental, sub-kHz integral linewidth self-injection locked 780 nm hybrid integrated laser
Excited to share that our work on photonic integrated ultra-narrow linewidth lasers at 780 nm has been published in Nature Scientific Reports.
This work focuses on advancing compact, chip-scale laser systems for quantum sensing and computing with rubidium atoms.
Our self-injection locked laser consists of a Fabry-Pérot laser diode coupled to an ultra-high Q SiN integrated resonator. We fully characterize the laser’s frequency noise and report a 0.7 Hz fundamental linewidth and 864 Hz integral linewidth -- record-low values at this wavelength. We also demonstrate its potential impact on atomic clocks, quantum computing gates, and cold atom interferometer gravimeters.
This work paves the way for future photonic integration at other atomic wavelengths and fully integrated atomic systems.
