Fig. 4: Demonstration of the multi-wavelength measurements.
From: An integrated wavemeter based on fully-stabilized resonant electro-optic frequency comb

Real-time evolution of the beat frequency between target lasers and the comb lines during the operation of the wavemeter. Firstly, the modulation frequency of the AOM is switched from 100 MHz to 90 MHz. Then, frep is tuned from 19.5005 GHz to 19.5025 GHz within 10 s.