Compact mid-infrared dual-comb spectrometer over 3-4μm via intra-pulse difference frequency generation in LiNbO_(3) waveguides  

作　　者：Lian Zhou Haipeng Lou Zejiang Deng Xiong Qin Jiayi Pan Yuanfeng Di Chenglin Gu Daping Luo Wenxue Li 

机构地区：[1]State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai,China [2]Joint Research Center of Light Manipulation Science and Photonic Integrated Chip of East China Normal University and Shandong Normal University,East China Normal University,Shanghai,China

出　　处：《High Power Laser Science and Engineering》2024年第3期1-8,共8页高功率激光科学与工程（英文版）

基　　金：supported in part by the National Natural Science Foundation of China(Nos.12204178,12104162,12134004 and 12274141)。

摘　　要：The mid-infrared optical frequency comb is a powerful tool for gas sensing.In this study,we demonstrate a simple midinfrared dual-comb spectrometer covering 3±4μm in Li Nb O_(3)waveguides.Based on a low-power fiber laser system,the mid-infrared comb is achieved via intra-pulse difference frequency generation in the Li Nb O_(3)waveguide.We construct pre-chirp management before supercontinuum generation to control spatiotemporal alignment for pump and signal pulses.The supercontinuum is directly coupled into a chirped periodically poled Li Nb O_(3)waveguide for the 3±4μm idler generation.A mid-infrared dual-comb spectrometer based on this approach provides a 100 MHz resolution over25 THz coverage.To evaluate the applicability for spectroscopy,we measure the methane spectrum using the dualcomb spectrometer.The measured results are consistent with the HITRAN database,in which the root mean square of the residual is 3.2%.This proposed method is expected to develop integrated and robust mid-infrared dual-comb spectrometers on chip for sensing.

关 键 词：difference frequency generation dual-comb spectroscopy mid-infrared gas sensing nonlinear optics 

分 类 号：TH744.1[机械工程—光学工程]