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Walsh DA, Cliffe MJ, Pan R, et al. Role of misalignment-induced angular chirp in the electro-optic detection of THz waves. Opt Express. 2014;22(10):12028-37doi: 10.1364/OE.22.012028.
Walsh, D. A., Cliffe, M. J., Pan, R., Snedden, E. W., Graham, D. M., Gillespie, W. A., & Jamison, S. P. (2014). Role of misalignment-induced angular chirp in the electro-optic detection of THz waves. Optics express, 22(10), 12028-37. https://doi.org/10.1364/OE.22.012028
Walsh, D A, et al. "Role of misalignment-induced angular chirp in the electro-optic detection of THz waves." Optics express vol. 22,10 (2014): 12028-37. doi: https://doi.org/10.1364/OE.22.012028
Walsh DA, Cliffe MJ, Pan R, Snedden EW, Graham DM, Gillespie WA, Jamison SP. Role of misalignment-induced angular chirp in the electro-optic detection of THz waves. Opt Express. 2014 May 19;22(10):12028-37. doi: 10.1364/OE.22.012028. PMID: 24921322.
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Opt Express. 2014 May 19;22(10):12028-37. doi: 10.1364/OE.22.012028.

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

Optics express

D A Walsh, M J Cliffe, R Pan, E W Snedden, D M Graham, W A Gillespie, S P Jamison

PMID: 24921322 DOI: 10.1364/OE.22.012028

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.

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