Chip-Scale Atomic Optical Clock

  • On 26 May, 2025

CSOC wants to make a chip-scale atomic optical clock. As part of this effort, SiN for chip-scale atomic clocks plays a crucial role: an on-chip mode-locked laser at 1310 nm is used to pump a silicon nitride resonator. The generated octave-spanning comb is sent to a 1f-to-2f on-chip interferometer to determine the carrier-envelope offset of the comb through self-referencing. Further, the light of an on-chip frequency-doubled narrow linewidth Distributed Feedback (DFB) laser is locked to an Rb transition in vapor as a second reference. These error signals, together with the comb's repetition rate frequency, allow the system to synthesize the clock signal.