Abstract
Two detection techniques of broadband terahertz (THz) time-domain
spectroscopy-THz air-biased coherent detection (THz-ABCD; from 0.3 to 14 THz) and
electro-optical (EO) detection (from 0.3 to 7 THz) - are both performed at several
different relative humidity levels. The THz power exponentially decays with the
increase in relative humidity. The dynamic range of the main pulse in the time
domain linearly decreases as the relative humidity increases from 0% to 40%, and
linear fittings show that the slopes are -0.017 and -0.019 for THz-ABCD and EO
detection, respectively. Because of the multiple reflections caused by the crystal
in the common EO detection, THz-ABCD has better spectral resolution (17 GHz) than
that of EO detection (170 GHz). The spectrum of water vapor absorption measured by
THz-ABCD is also compared with that measured by the Fourier transform infrared
spectroscopy (FTIR).
© 2012 Chinese Optics Letters
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription