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	Distortion reduction in strong terahertz signals using broadband attenuators with flat transmittance
	Peng, Xiao-Yu1,2; Teng, Jinghua1; Liu, Hongwei1; Tanoto, Hendrix1; Guo, Hongchen1; Sheng, Zheng-Ming3,4; Zhang, Jie3,4
	2016-01-13
摘要	We demonstrate numerically and experimentally a simple approach to significantly reduce the distortion of a strong terahertz (THz) pulse signal measured by the spectral-encoding technique. We propose using broadband THz attenuators with flat transmittance to attenuate the input signal to a certain low level corresponding to the strongest spectrum difference Delta I for the main negative polar. The real THz waveform can be recovered by multiplying the attenuated THz waveform by the reciprocal of the attenuation factor of the main positive polar. Using a suitable number of broadband attenuators with flat transmittance, and considering an acceptable signal-to-noise ratio, the severely distorted strong THz signal from the air plasmas induced by two-color femtosecond laser pulses was reduced significantly.
关键词	distortion reduction terahertz signal spectral-encoding technique broadband terahertz attenuator
DOI	10.1088/0022-3727/49/1/015501
发表期刊	JOURNAL OF PHYSICS D-APPLIED PHYSICS
ISSN	0022-3727
卷号	49期号:1页码:9
收录类别	SCI
WOS记录号	WOS:000368089100012
语种	英语