Spectral interference of terahertz pulses from two laser filaments in air

Chen, Yanping and Zhang, Zhelin and Zhang, Zhen and Yuan, Xiaohui and Liu, Feng and Chen, Min and Xu, Jianqiu and Yu, Jin and Sheng, Zheng-Ming and Zhang, Jie (2015) Spectral interference of terahertz pulses from two laser filaments in air. Applied Physics Letters, 106 (22). 221105. ISSN 0003-6951

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    Abstract

    Spectral interference is experimentally demonstrated by two terahertz pulses emitting from filaments induced by two successive femtosecond laser pulses in air. Here, a leading pulse is set to be weaker than a trailing pulse and their temporal separation is larger than the pulse duration of the terahertz pulses. When the leading pulse is stronger than the trailing pulse, the frequency modulation within the whole terahertz envelope is greatly deteriorated due to nonlinear effects applying on the trailing pulse through the plasmas generated by the leading pulses. Such unique terahertz spectrum may find applications in terahertz spectroscopy.