Abstract
An overview of the major techniques to generate and detect THz radiation so
far, especially the major approaches to generate and detect coherent ultra-short THz
pulses using ultra-short pulsed laser, has been presented. And also, this paper, in
particularly, focuses on broadband THz spectroscopy and addresses on a number of
issues relevant to generation and detection of broadband pulsed THz radiation as
well as broadband time-domain THz spectroscopy (THz-TDS) with the help of
ultra-short pulsed laser. The time-domain waveforms of coherent ultra-short THz
pulses from photoconductive antenna excited by femtosecond laser with different
pulse durations and their corresponding Fourier-transformed spectra have been
obtained via the numerical simulation of ultrafast dynamics between femtosecond
laser pulse and photoconductive material. The origins of fringes modulated on the
top of broadband amplitude spectrum, which is measured by electric-optic detector
based on thin nonlinear crystal and extracted by fast Fourier transformation, have
been analyzed and the major solutions to get rid of these fringes are discussed.
© 2011 Chinese Optics Letters
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