Fig. 1: The schematic and operating principle of the wavemeter.
From: An integrated wavemeter based on fully-stabilized resonant electro-optic frequency comb
a The schematic of the chip-scale wavemeter circuit. The electro-optic (EO) comb is generated in a lithium niobate (LN) resonator using the stabilized pump laser. The target laser is combined with the stabilized EO comb to validate the performance of the EO comb for frequency measurement. b The operating principle of the wavemeter. Through detecting the beat frequency (Δf) between the target laser and the adjacent comb line and analyzing the relative mode number μ of the adjacent comb line and the sign before the Δf, the frequency of the target laser fm = fp + μfrep ± Δf can be obtained. c Optical micrograph of the LN microring resonator. S(G) denotes the signal (ground) electrode.
