[17p-WL2_301-1~15] 3.7 Optical measurement, instrumentation, and sensor

3:45 PM - 4:00 PM JST(6:45 AM - 7:00 AM UTC)

[17p-WL2_301-9] High-Resolution Absorption Spectroscopy Based on Stepped Frequency Sweeping using an SSB Modulator in a Dual EO Comb System

〇(M2)Sayaka Shishido¹, Kenichi Hitachi², Atsushi Ishizawa³, Tadashi Nishikawa¹ (1.Tokyo Denki Univ., 2.NTT BRL., 3.Nihon Univ.)

Keywords:

Optical frequency comb,Dual-comb spectroscopy

Recently, dual electro-optic (EO) comb spectroscopy has gained attention as a high-speed and high-precision method. High-performance analysis requires interpolating the gaps between spectral lines while ensuring a wide bandwidth through large mode spacing. In the previously reported continuous frequency shifting method using an SSB modulator (SSBM), frequency precision was limited by the nonlinear characteristics of the RF signal sweep. In this study, we developed a stepped automatic interpolation system that sweeps the SSBM drive RF signal in 100 MHz steps and automatically combines the data.