摘要
High-resolution frequency-domain spectroscopy(FDS) is set up using a coherent and continuous wave terahertz(THz) emitter and receiver.THz waves are generated and detected by two photomixers with two distributed feedback(DFB) lasers.Atmospheric water vapor with different relative humidity is systematically investigated by the FDS.A high-frequency resolution of ~14 MHz is obtained with the help of Hilbert transformation, leading to a well resolved and distinct transmittance characterization of water vapor.Compared with conventional THz time-domain spectroscopy, the high-resolution continuous wave THz spectrometer is one of the most practical systems in gas-phase molecular sensing, identification, and monitoring.
High-resolution frequency-domain spectroscopy(FDS) is set up using a coherent and continuous wave terahertz(THz) emitter and receiver. THz waves are generated and detected by two photomixers with two distributed feedback(DFB) lasers. Atmospheric water vapor with different relative humidity is systematically investigated by the FDS. A high-frequency resolution of ～14 MHz is obtained with the help of Hilbert transformation, leading to a well resolved and distinct transmittance characterization of water vapor. Compared with conventional THz time-domain spectroscopy, the high-resolution continuous wave THz spectrometer is one of the most practical systems in gas-phase molecular sensing, identification, and monitoring.
作者
阮存军
孔德胤
戴军
陈康龙
郭素杰
吴晓君
Cunjun Ruan;Deyin Kong;Jun Dai;Kanglong Chen;Sujie Guo;Xiaojun Wu
基金
supported by the National Natural Science Foundation of China(Nos.61831001 and 61222110)
；the High-Level Talent Introduction Project of Beihang University(No.ZG216S1878)
the Youth-Top-Talent Support Project of Beihang University(No.ZG226S1821)
