The consequences of diffractively spreading beams in ultrafast THz spectroscopy
Bowen, J. W., Walker, G. C., Hadjiloucas, S. and Berry, E. (2004) The consequences of diffractively spreading beams in ultrafast THz spectroscopy. In: Thumm, M. and Wiesbeck, W. (eds.) Conference Digest of the 2004 Joint 29th International Conference on Infrared and Millimeter Waves and 12th International Conference on Terahertz Electronics. IEEE, New York, pp. 551-552. ISBN 0780384903
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There are established methods for calculating optical constants from measurements using a broadband terahertz (THz) source. Applications to ultrafast THz spectroscopy have adopted the key assumption that the THz beam is treated as a normal incidence plane-wave. We show that this assumption results in a frequency-dependent systematic error, which is compounded by distortion of the beam on introduction of the sample.