GHz-scale rapid frequency-hopping laser system for atom interferometry

We demonstrate a dual-laser architecture capable of GHz-scale rapid frequency hopping for atom interferometers (AIs). The system integrates two phase-locked fixed-external-cavity diode lasers: a reference laser stabilized to Rubidium 87 D 2 transition and a slave laser phase-locked to the reference via an optical phase-lock loop. This configuration achieves rapid frequency hopping of 1.1 GHz in 65 µs without unlock-and-relock process. Validated through Raman spectroscopy and optical depth measurements in a fiber-guided AI, the laser system provides a potential solution for developing miniaturized portable AIs.