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Optimization of the Tilted-Pulse-Front Terahertz Excitation Setup Containing Telescope

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Abstract

Optimization of the telescopic tilted-pulse-front terahertz excitation setup with respect to the imaging errors is given. A guideline is presented in the form of simple analytical formulae describing the optimal geometrical configuration of the telescopic setup. Pump pulse distortions and terahertz wave-front distortions are analyzed by ray tracing calculations supposing near-infrared pump pulses with 200 fs transform limited pulse length. The detrimental effects of imaging errors in a tilted-pulse-front terahertz source can be significantly reduced by using telescopic imaging instead of one-lens. It is also shown, that in the case of the one-lens setup significant, and in the case of the telescopic setup, less significant reduction of the imaging errors can be achieved by using achromat lens(es) instead of singlet one(s). Calculation results show that the telescopic setup consisting of two achromat lenses is the most promising choice among the practically relevant schemes.

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Acknowledgments

Financial support from Hungarian Scientific Research Fund (OTKA) grant number 113083 is acknowledged. The present scientific contribution is dedicated to the 650th anniversary of the foundation of the University of Pécs, Hungary

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Authors and Affiliations

  1. Institute of Physics, University of Pécs, Ifjúság ú. 6, 7624, Pécs, Hungary

    Levente Tokodi, J. Hebling & L. Pálfalvi

  2. High-Field Terahertz Research Group, MTA-PTE Ifjúság ú. 6, 7624, Pécs, Hungary

    J. Hebling

  3. Szentágothai Research Centre, University of Pécs, Ifjúság ú. 20, 7624, Pécs, Hungary

    J. Hebling

Authors
  1. Levente Tokodi
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  2. J. Hebling
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  3. L. Pálfalvi
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Corresponding author

Correspondence to Levente Tokodi.

Appendix

Appendix

The lens specifications of the one-lens and telescopic setups are seen in Table 1. The singlet and near-infrared achromat lenses were selected from catalogues (EO: Edmund Optics, TL: ThorLabs). The nominal focal lengths and lens materials are given in the Table. The notation “Material Ij” denotes the material type of the jth layer of the Ith lens, with j, I = 1, 2. “Cat. Nr. I” denotes the catalogue number of the Ith lens. Obviously in some cases some data are not relevant (n.r.). The last two columns show the \( \sqrt{a} \) factor (Eq. (19)) and the focal length ratio.

Table 1 The specifications of the lenses used in the simulations
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Tokodi, L., Hebling, J. & Pálfalvi, L. Optimization of the Tilted-Pulse-Front Terahertz Excitation Setup Containing Telescope. J Infrared Milli Terahz Waves 38, 22–32 (2017). https://doi.org/10.1007/s10762-016-0307-4

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