Broadband Single-Shot THz Sampling Using Reflection Gratings
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909791819923456 |
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| author | Wu, Chih-Chieh Buzzi, Michele Cavalleri, Andrea |
| author_facet | Wu, Chih-Chieh Buzzi, Michele Cavalleri, Andrea |
| contents | Single-shot electro-optic sampling (EOS) is a powerful method enabling the measurement of weak terahertz signals that would otherwise require prohibitively long acquisition times. This is generally achieved by encoding the EOS time delay into a spatial, angular, or frequency coordinate. In general, this technique operates well up to 3 THz but becomes more challenging for larger bandwidths, due to dispersion and imaging imperfections. Here, we demonstrate a reliable angular-encoding single shot EOS implementation that reaches frequencies beyond 6 THz. Diffraction simulations are used to design the experimental setup and adapt this technique to commercial reflection gratings, removing the need for custom-built echelon mirrors. Furthermore, we show that, contrary to earlier reports, group delay dispersion from angular dispersion does not reduce the bandwidth of single-shot EOS. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_13467 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Broadband Single-Shot THz Sampling Using Reflection Gratings Wu, Chih-Chieh Buzzi, Michele Cavalleri, Andrea Optics Instrumentation and Detectors Single-shot electro-optic sampling (EOS) is a powerful method enabling the measurement of weak terahertz signals that would otherwise require prohibitively long acquisition times. This is generally achieved by encoding the EOS time delay into a spatial, angular, or frequency coordinate. In general, this technique operates well up to 3 THz but becomes more challenging for larger bandwidths, due to dispersion and imaging imperfections. Here, we demonstrate a reliable angular-encoding single shot EOS implementation that reaches frequencies beyond 6 THz. Diffraction simulations are used to design the experimental setup and adapt this technique to commercial reflection gratings, removing the need for custom-built echelon mirrors. Furthermore, we show that, contrary to earlier reports, group delay dispersion from angular dispersion does not reduce the bandwidth of single-shot EOS. |
| title | Broadband Single-Shot THz Sampling Using Reflection Gratings |
| topic | Optics Instrumentation and Detectors |
| url | https://arxiv.org/abs/2509.13467 |