Sub-femtometer-resolution absolute spectroscopy with sweeping electro-optic combs
스위핑 전기 광학 빗을 사용한 서브 펨토미터 분해능 절대 분광법
Espectroscopia absoluta de resolución subfemtómetro con peines electroópticos de barrido
Spectroscopie absolue à résolution inférieure au femtomètre avec peignes électro-optiques à balayage
Абсолютная спектроскопия с субфемтометровым разрешением и сканирующими электрооптическими гребенками
Bingxin Xu 徐炳鑫, Xinyu Fan 樊昕昱, Shuai Wang 汪帅, Zuyuan He 何祖源
State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
中国 上海 上海交通大学电子工程系 区域光纤通信网与新型光通信系统国家重点实验室
Opto-Electronic Advances, 27 April 2022

Optical frequency comb with evenly spaced lines over a broad bandwidth has revolutionized the fields of optical metrology and spectroscopy. Here, we propose a fast interleaved dual-comb spectroscopy with sub-femtometer-resolution and absolute frequency, in which two electro-optic frequency combs are swept.

Electrically-modulated stabilized laser enables ultrahigh resolution of 0.16 fm (or 20 kHz in optical frequency) and single-shot measurement in 90 ms. Total 20 million points are recorded spanning 3.2 nm (or 400 GHz) bandwidth, corresponding to a spectral sampling rate of 2.5 × 108 points/s under Nyquist-limitation. Besides, considering the trade-off between the measurement time and spectral resolution, a fast single-shot measurement is also realized in 1.6 ms with 8 fm (or 1 MHz) resolution.

We demonstrate the 25-averaged result with 30.6 dB spectral measurement signal-to-noise ratio (SNR) by reducing the filter bandwidth in demodulation. The results show great prospect for precise measurement with flexibly fast refresh time, high spectral resolution, and high SNR.
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