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

Walsh, D.A. and Cliffe, M.J. and Pan, R. and Snedden, E.W. and Graham, D.M. and Gillespie, W.A. and Jamison, S.P. (2014) Role of misalignment-induced angular chirp in the electro-optic detection of THz waves. Optics Express, 22 (10). pp. 12028-12037. ISSN 1094-4087

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Abstract

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.

Item Type:
Journal Article
Journal or Publication Title:
Optics Express
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3107
Subjects:
ID Code:
125929
Deposited By:
Deposited On:
18 Jun 2018 11:14
Refereed?:
Yes
Published?:
Published
Last Modified:
09 Sep 2020 05:01