Sub-Hz fundamental, sub-kHz integral linewidth self-injection locked 780 nm hybrid integrated laser.

ABSTRACT: Today's precision experiments for timekeeping, inertial sensing, and fundamental science place strict requirements on the spectral distribution of laser frequency noise. Rubidium-based experiments utilize table-top 780 nm laser systems for high-performance clocks, gravity sensors, and quantum gates. Wafer-scale integration of these lasers is critical for enabling systems-on-chip. Despite progress towards chip-scale 780 nm ultra-narrow linewidth lasers, achieving sub-Hz fundamental linewidth and sub-kHz integral linewidth has remained elusive. Here we report a hybrid integrated 780 nm self-injection locked laser with 0.74 Hz fundamental and 864 Hz integral linewidths and thermorefractive-noise-limited 100 Hz²/Hz at 10 kHz. These linewidths are over an order of magnitude lower tha

SUBMITTER: Isichenko A 

PROVIDER: S-EPMC11574317 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature