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Role of misalignment-induced angular chirp in the electro-optic detection of THz waves

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  • D.A. Walsh
  • M.J. Cliffe
  • R. Pan
  • E.W. Snedden
  • D.M. Graham
  • W.A. Gillespie
  • S.P. Jamison
<mark>Journal publication date</mark>12/05/2014
<mark>Journal</mark>Optics Express
Issue number10
Number of pages10
Pages (from-to)12028-12037
Publication StatusPublished
<mark>Original language</mark>English


A general description of electro-optic detection including non-collinear phase matching and finite transverse beam profiles is presented. It is shown theoretically and experimentally that non-collinear phase matching in ZnTe (and similar materials) produces an angular chirp in the χ(2)-generated optical signal. Due to this, in non-collinear THz and probe arrangements such as single-shot THz measurements or through accidental misalignment, measurement of an undistorted THz signal is critically dependent on having sufficient angular acceptance in the optical probe path. The associated spatial walk-off can also preclude the phase retardation approximation used in THz-TDS. The rate of misalignment-induced chirping in commonly used ZnTe and GaP schemes is tabulated, allowing ready analysis of a detection system.