title: [Joint time-frequency analysis for removing the spectral interference of terahertz].
abstract: Conventional Fourier-transform mixes the frequency components of the entire temporal terahertz waveform in one frequency domain; therefore, it cannot distinguish the terahertz frequency in the main pulse from the noise frequency in the pulse tail. Thus traditional Fourier-transform produces inconsistent spectra from different scanning lengths of terahertz pulse. And the interference spectrum appears when the THz echo pulse is recorded. The authors applied wavelet-transform and removed the inconsistent spectra and the interference spectra. Wavelet-transform technique exhibited the local frequency of THz in different time locations. This technique would find applications in THz time-resolved spectroscopy.
authors.affiliation: Optics Division, National Institute of Metrology, Beijing 100013, China. sunqing@nim.ac.cn
authors.forename: Qing
authors.initials: Q
authors.lastname: Sun
authors.forename: Yu-Qiang
authors.initials: YQ
authors.lastname: Deng
authors.forename: Shi-Ying
authors.initials: SY
authors.lastname: Cao
authors.forename: Jing
authors.initials: J
authors.lastname: Yu
authors.forename: Feng
authors.initials: F
authors.lastname: Liu
authors.forename: Chang-Lei
authors.initials: CL
authors.lastname: Wang
authors.forename: Qi-Rong
authors.initials: QR
authors.lastname: Xing